⬆️ Bump github/codeql-action from 4.32.1 to 4.32.3 (#5077)

Bumps [github/codeql-action](https://github.com/github/codeql-action) from 4.32.1 to 4.32.3.
- [Release notes](https://github.com/github/codeql-action/releases)
- [Changelog](https://github.com/github/codeql-action/blob/main/CHANGELOG.md)
- [Commits](6bc82e05fd...9e907b5e64)

---
updated-dependencies:
- dependency-name: github/codeql-action
  dependency-version: 4.32.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.cirrus.yml

@@ -1,22 +1,17 @@
-kind: pipeline
-name: test-on-arm64
+arm_container:
+  image: gcc:latest
 
-platform:
-  arch: arm64
-
-steps:
-- name: build
-  image: gcc
-  commands:
+check_task:
+  check_script:
   - wget https://github.com/Kitware/CMake/releases/download/v3.20.2/cmake-3.20.2.tar.gz
   - tar xfz cmake-3.20.2.tar.gz
   - cd cmake-3.20.2
   - ./configure
-  - make cmake ctest -j10
+  - make cmake ctest -j4
   - cd ..
   - mkdir build
   - cd build
   - ../cmake-3.20.2/bin/cmake .. -DJSON_FastTests=ON
-  - make -j10
+  - make -j4
   - cd tests
-  - ../../cmake-3.20.2/bin/ctest -j10
+  - ../../cmake-3.20.2/bin/ctest -j4

.clang-format

@@ -1,84 +0,0 @@
-#AccessModifierOffset: 2
-AlignAfterOpenBracket: Align
-AlignConsecutiveAssignments: false
-#AlignConsecutiveBitFields: false
-AlignConsecutiveDeclarations: false
-AlignConsecutiveMacros: false
-AlignEscapedNewlines: Right
-#AlignOperands: AlignAfterOperator
-AlignTrailingComments: true
-AllowAllArgumentsOnNextLine: false
-AllowAllConstructorInitializersOnNextLine: false
-AllowAllParametersOfDeclarationOnNextLine: false
-AllowShortBlocksOnASingleLine: Empty
-AllowShortCaseLabelsOnASingleLine: false
-#AllowShortEnumsOnASingleLine: true
-AllowShortFunctionsOnASingleLine: Empty
-AllowShortIfStatementsOnASingleLine: Never
-AllowShortLambdasOnASingleLine: Empty
-AllowShortLoopsOnASingleLine: false
-AlwaysBreakAfterReturnType: None
-AlwaysBreakBeforeMultilineStrings: false
-AlwaysBreakTemplateDeclarations: Yes
-BinPackArguments: false
-BinPackParameters: false
-#BitFieldColonSpacing: Both
-BreakBeforeBraces: Custom # or Allman
-BraceWrapping:
-  AfterCaseLabel: true
-  AfterClass: true
-  AfterControlStatement: Always
-  AfterEnum: true
-  AfterFunction: true
-  AfterNamespace: false
-  AfterStruct: true
-  AfterUnion: true
-  AfterExternBlock: false
-  BeforeCatch: true
-  BeforeElse: true
-  #BeforeLambdaBody: false
-  #BeforeWhile: false
-  SplitEmptyFunction: false
-  SplitEmptyRecord: false
-  SplitEmptyNamespace: false
-BreakBeforeTernaryOperators: true
-BreakConstructorInitializers: BeforeComma
-BreakStringLiterals: false
-ColumnLimit: 0
-CompactNamespaces: false
-ConstructorInitializerIndentWidth: 2
-Cpp11BracedListStyle: true
-PointerAlignment: Left
-FixNamespaceComments: true
-IncludeBlocks: Preserve
-#IndentCaseBlocks: false
-IndentCaseLabels: true
-IndentGotoLabels: false
-IndentPPDirectives: BeforeHash
-IndentWidth: 4
-KeepEmptyLinesAtTheStartOfBlocks: false
-MaxEmptyLinesToKeep: 1
-NamespaceIndentation: None
-ReflowComments: false
-SortIncludes: true
-SortUsingDeclarations: true
-SpaceAfterCStyleCast: false
-SpaceAfterLogicalNot: false
-SpaceAfterTemplateKeyword: false
-SpaceBeforeAssignmentOperators: true
-SpaceBeforeCpp11BracedList: false
-SpaceBeforeParens: ControlStatements
-SpaceBeforeRangeBasedForLoopColon: true
-SpaceBeforeSquareBrackets: false
-SpaceInEmptyBlock: false
-SpaceInEmptyParentheses: false
-SpacesBeforeTrailingComments: 2
-SpacesInAngles: false
-SpacesInCStyleCastParentheses: false
-SpacesInConditionalStatement: false
-SpacesInContainerLiterals: false
-SpacesInParentheses: false
-SpacesInSquareBrackets: false
-Standard: c++11
-TabWidth: 4
-UseTab: Never

.clang-tidy

@@ -1,26 +1,41 @@
+# TODO: The first three checks are only removed to get the CI going. They have to be addressed at some point.
+# TODO: portability-avoid-pragma-once: should be fixed eventually
+
 Checks: '*,
+
+         -portability-template-virtual-member-function,
+         -bugprone-use-after-move,
+         -hicpp-invalid-access-moved,
+
          -altera-id-dependent-backward-branch,
          -altera-struct-pack-align,
          -altera-unroll-loops,
          -android-cloexec-fopen,
+         -boost-use-ranges,
          -bugprone-easily-swappable-parameters,
          -cert-err58-cpp,
+         -clang-analyzer-webkit.NoUncountedMemberChecker,
          -concurrency-mt-unsafe,
+         -cppcoreguidelines-avoid-const-or-ref-data-members,
+         -cppcoreguidelines-avoid-do-while,
          -cppcoreguidelines-avoid-goto,
          -cppcoreguidelines-avoid-magic-numbers,
          -cppcoreguidelines-avoid-non-const-global-variables,
          -cppcoreguidelines-macro-usage,
+         -cppcoreguidelines-pro-bounds-avoid-unchecked-container-access,
          -cppcoreguidelines-pro-bounds-array-to-pointer-decay,
          -cppcoreguidelines-pro-bounds-constant-array-index,
          -cppcoreguidelines-pro-bounds-pointer-arithmetic,
          -cppcoreguidelines-pro-type-reinterpret-cast,
          -cppcoreguidelines-pro-type-union-access,
+         -cppcoreguidelines-rvalue-reference-param-not-moved,
          -cppcoreguidelines-virtual-class-destructor,
          -fuchsia-default-arguments-calls,
          -fuchsia-default-arguments-declarations,
          -fuchsia-overloaded-operator,
          -google-explicit-constructor,
          -google-readability-function-size,
+         -google-runtime-float,
          -google-runtime-int,
          -google-runtime-references,
          -hicpp-avoid-goto,
@@ -32,19 +47,33 @@ Checks: '*,
          -hicpp-uppercase-literal-suffix,
          -llvm-header-guard,
          -llvm-include-order,
+         -llvm-prefer-static-over-anonymous-namespace,
+         -llvm-use-ranges,
          -llvmlibc-*,
+         -misc-use-anonymous-namespace,
+         -misc-confusable-identifiers,
+         -misc-include-cleaner,
          -misc-no-recursion,
          -misc-non-private-member-variables-in-classes,
          -modernize-concat-nested-namespaces,
+         -modernize-type-traits,
+         -modernize-use-constraints,
+         -modernize-use-designated-initializers,
          -modernize-use-nodiscard,
+         -modernize-use-ranges,
+         -modernize-use-std-numbers,
          -modernize-use-trailing-return-type,
+         -performance-enum-size,
+         -portability-avoid-pragma-once,
          -readability-function-cognitive-complexity,
          -readability-function-size,
          -readability-identifier-length,
          -readability-magic-numbers,
          -readability-redundant-access-specifiers,
+         -readability-redundant-parentheses,
          -readability-simplify-boolean-expr,
-         -readability-uppercase-literal-suffix'
+         -readability-uppercase-literal-suffix,
+         -readability-use-concise-preprocessor-directives'
 
 CheckOptions:
   - key: hicpp-special-member-functions.AllowSoleDefaultDtor

.github/CODEOWNERS

@@ -1,5 +1,5 @@
-# JSON for Modern C++ has been originally written by Niels Lohmann.
-# Since 2013 over 140 contributors have helped to improve the library.
+# JSON for Modern C++ was originally written by Niels Lohmann.
+# Since 2013, over 250 contributors have helped to improve the library.
 # This CODEOWNERS file is only to make sure that @nlohmann is requested
 # for a code review in case of a pull request.
 

.github/CODE_OF_CONDUCT.md

@@ -2,45 +2,131 @@
 
 ## Our Pledge
 
-In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to making participation in our project and our community a harassment-free experience for everyone, regardless of age, body size, disability, ethnicity, gender identity and expression, level of experience, nationality, personal appearance, race, religion, or sexual identity and orientation.
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, caste, color, religion, or sexual
+identity and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
 
 ## Our Standards
 
-Examples of behavior that contributes to creating a positive environment include:
+Examples of behavior that contributes to a positive environment for our
+community include:
 
-* Using welcoming and inclusive language
-* Being respectful of differing viewpoints and experiences
-* Gracefully accepting constructive criticism
-* Focusing on what is best for the community
-* Showing empathy towards other community members
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the overall
+  community
 
-Examples of unacceptable behavior by participants include:
+Examples of unacceptable behavior include:
 
-* The use of sexualized language or imagery and unwelcome sexual attention or advances
-* Trolling, insulting/derogatory comments, and personal or political attacks
+* The use of sexualized language or imagery, and sexual attention or advances of
+  any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
 * Public or private harassment
-* Publishing others' private information, such as a physical or electronic address, without explicit permission
-* Other conduct which could reasonably be considered inappropriate in a professional setting
+* Publishing others' private information, such as a physical or email address,
+  without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
 
-## Our Responsibilities
+## Enforcement Responsibilities
 
-Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take appropriate and fair corrective action in response to any instances of unacceptable behavior.
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
 
-Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
 
 ## Scope
 
-This Code of Conduct applies both within project spaces and in public spaces when an individual is representing the project or its community. Examples of representing a project or community include using an official project e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event. Representation of a project may be further defined and clarified by project maintainers.
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+Examples of representing our community include using an official email address,
+posting via an official social media account, or acting as an appointed
+representative at an online or offline event.
 
 ## Enforcement
 
-Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting the project team at mail@nlohmann.me. The project team will review and investigate all complaints, and will respond in a way that it deems appropriate to the circumstances. The project team is obligated to maintain confidentiality with regard to the reporter of an incident. Further details of specific enforcement policies may be posted separately.
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at
+[mail@nlohmann.me](mailto:mail@nlohmann.me).
+All complaints will be reviewed and investigated promptly and fairly.
 
-Project maintainers who do not follow or enforce the Code of Conduct in good faith may face temporary or permanent repercussions as determined by other members of the project's leadership.
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed
+unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing
+clarity around the nature of the violation and an explanation of why the
+behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series of
+actions.
+
+**Consequence**: A warning with consequences for continued behavior. No
+interaction with the people involved, including unsolicited interaction with
+those enforcing the Code of Conduct, for a specified period of time. This
+includes avoiding interactions in community spaces as well as external channels
+like social media. Violating these terms may lead to a temporary or permanent
+ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behavior, harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within the
+community.
 
 ## Attribution
 
-This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, available at [http://contributor-covenant.org/version/1/4][version]
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.1, available at
+[https://www.contributor-covenant.org/version/2/1/code_of_conduct.html][v2.1].
 
-[homepage]: http://contributor-covenant.org
-[version]: http://contributor-covenant.org/version/1/4/
+Community Impact Guidelines were inspired by
+[Mozilla's code of conduct enforcement ladder][Mozilla CoC].
+
+For answers to common questions about this code of conduct, see the FAQ at
+[https://www.contributor-covenant.org/faq][FAQ]. Translations are available at
+[https://www.contributor-covenant.org/translations][translations].
+
+[homepage]: https://www.contributor-covenant.org
+[v2.1]: https://www.contributor-covenant.org/version/2/1/code_of_conduct.html
+[Mozilla CoC]: https://github.com/mozilla/diversity
+[FAQ]: https://www.contributor-covenant.org/faq
+[translations]: https://www.contributor-covenant.org/translations

.github/CONTRIBUTING.md

@@ -1,71 +1,225 @@
-[![Issue Stats](http://issuestats.com/github/nlohmann/json/badge/pr?style=flat)](http://issuestats.com/github/nlohmann/json) [![Issue Stats](http://issuestats.com/github/nlohmann/json/badge/issue?style=flat)](http://issuestats.com/github/nlohmann/json)
+# Contribution Guidelines
 
-# How to contribute
+Thank you for your interest in contributing to this project! What began as an exercise to explore the exciting features
+of C++11 has evolved into a [widely used](https://json.nlohmann.me/home/customers/) JSON library. I truly appreciate all
+the contributions from the community, whether it's proposing features, identifying bugs, or fixing mistakes! To ensure
+that our collaboration is efficient and effective, please follow these guidelines.
 
-This project started as a little excuse to exercise some of the cool new C++11 features. Over time, people actually started to use the JSON library (yey!) and started to help improve it by proposing features, finding bugs, or even fixing my mistakes. I am really [thankful](https://github.com/nlohmann/json/blob/master/README.md#thanks) for this and try to keep track of all the helpers.
+Feel free to discuss or suggest improvements to this document
+[by submitting a pull request](https://github.com/nlohmann/json/edit/develop/.github/CONTRIBUTING.md).
 
-To make it as easy as possible for you to contribute and for me to keep an overview, here are a few guidelines which should help us avoid all kinds of unnecessary work or disappointment. And of course, this document is subject to discussion, so please [create an issue](https://github.com/nlohmann/json/issues/new/choose) or a pull request if you find a way to improve it!
+## Ways to Contribute
 
-## Private reports
+There are multiple ways to contribute.
 
-Usually, all issues are tracked publicly on [GitHub](https://github.com/nlohmann/json/issues). If you want to make a private report (e.g., for a vulnerability or to attach an example that is not meant to be published), please send an email to <mail@nlohmann.me>.
+### Reporting an issue
 
-## Prerequisites
-
-Please [create an issue](https://github.com/nlohmann/json/issues/new/choose), assuming one does not already exist, and describe your concern. Note you need a [GitHub account](https://github.com/signup/free) for this.
-
-## Describe your issue
+Please [create an issue](https://github.com/nlohmann/json/issues/new/choose), assuming one does not already exist, and
+describe your concern. Note you need a [GitHub account](https://github.com/signup/free) for this.
 
 Clearly describe the issue:
 
-- If it is a bug, please describe how to **reproduce** it. If possible, attach a complete example which demonstrates the error. Please also state what you **expected** to happen instead of the error.
-- If you propose a change or addition, try to give an **example** how the improved code could look like or how to use it.
-- If you found a compilation error, please tell us which **compiler** (version and operating system) you used and paste the (relevant part of) the error messages to the ticket.
+- If it is a bug, please describe how to **reproduce** it. If possible, attach a _complete example_ which demonstrates
+  the error. Please also state what you **expected** to happen instead of the error.
+- If you propose a change or addition, try to give an **example** what the improved code could look like or how to use
+  it.
+- If you found a compilation error, please tell us which **compiler** (version and operating system) you used and paste
+  the (relevant part of) the error messages to the ticket.
 
-Please stick to the provided issue template ([bug report](https://github.com/nlohmann/json/blob/develop/.github/ISSUE_TEMPLATE/bug.yml) if possible. For questions, feature or support requests, please [open a discussion](https://github.com/nlohmann/json/discussions/new).
+Please stick to the provided issue template
+[bug report](https://github.com/nlohmann/json/blob/develop/.github/ISSUE_TEMPLATE/bug.yaml) if possible.
 
-## Files to change
+### Reporting a security vulnerability
 
-:exclamation: Before you make any changes, note the single-header files [`single_include/nlohmann/json.hpp`](https://github.com/nlohmann/json/blob/develop/single_include/nlohmann/json.hpp) and [`single_include/nlohmann/json_fwd.hpp`](https://github.com/nlohmann/json/blob/develop/single_include/nlohmann/json_fwd.hpp) are **generated** from the source files in the [`include/nlohmann` directory](https://github.com/nlohmann/json/tree/develop/include/nlohmann). Please **do not** edit the files `single_include/nlohmann/json.hpp` and `single_include/nlohmann/json_fwd.hpp` directly, but change the `include/nlohmann` sources and regenerate the files by executing `make amalgamate`.
+You can report a security vulnerability according to our
+[security policy](https://github.com/nlohmann/json/security/policy).
 
-To make changes, you need to edit the following files:
+### Discussing a new feature
 
-1. [`include/nlohmann/*`](https://github.com/nlohmann/json/tree/develop/include/nlohmann) - These files are the sources of the library. Before testing or creating a pull request, execute `make amalgamate` to regenerate `single_include/nlohmann/json.hpp` and `single_include/nlohmann/json_fwd.hpp`.
+For questions, feature or support requests, please
+[open a discussion](https://github.com/nlohmann/json/discussions/new). If you find a proposed answer satisfactory,
+please use the "Mark as answer" button to make it easier for readers to see what helped and for the community to filter
+for open questions.
 
-2. [`tests/src/unit-*.cpp`](https://github.com/nlohmann/json/tree/develop/tests/src) - These files contain the [doctest](https://github.com/onqtam/doctest) unit tests which currently cover [100 %](https://coveralls.io/github/nlohmann/json) of the library's code.
+### Proposing a fix or an improvement
 
-   If you add or change a feature, please also add a unit test to this file. The unit tests can be compiled and executed with
+Join an ongoing discussion or comment on an existing issue before starting to code. This can help to avoid duplicate
+efforts or other frustration during the later review.
 
-   ```sh
-   $ mkdir build
-   $ cd build
-   $ cmake ..
-   $ cmake --build .
-   $ ctest
-   ```
+Create a [pull request](https://github.com/nlohmann/json/pulls?q=sort%3Aupdated-desc+is%3Apr+is%3Aopen) against the
+`develop` branch and follow the pull request template. In particular,
 
-   The test cases are also executed with several different compilers on [Travis](https://travis-ci.org/nlohmann/json) once you open a pull request.
+- describe the changes in detail, both the what and why,
+- reference existing issues where applicable,
+- add tests to maintain 100% test coverage,
+- update the documentation as needed, and
+- ensure the source code is amalgamated.
 
+We describe all points in detail below.
 
-## Note
+All contributions (including pull requests) must agree to the
+[Developer Certificate of Origin (DCO) version 1.1](https://developercertificate.org). This is exactly the same one
+created and used by the Linux kernel developers and posted on http://developercertificate.org/. This is a developer's
+certification that he or she has the right to submit the patch for inclusion into the project.
 
-- If you open a pull request, the code will be automatically tested with [Valgrind](http://valgrind.org)'s Memcheck tool to detect memory leaks. Please be aware that the execution with Valgrind _may_ in rare cases yield different behavior than running the code directly. This can result in failing unit tests which run successfully without Valgrind.
-- There is a Makefile target `make pretty` which runs [Artistic Style](http://astyle.sourceforge.net) to fix indentation. If possible, run it before opening the pull request. Otherwise, we shall run it afterward.
+## How to...
 
-## Please don't
+### Describe your changes
 
-- The C++11 support varies between different **compilers** and versions. Please note the [list of supported compilers](https://github.com/nlohmann/json/blob/master/README.md#supported-compilers). Some compilers like GCC 4.7 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support. Please refrain from proposing changes that work around these compiler's limitations with `#ifdef`s or other means.
-- Specifically, I am aware of compilation problems with **Microsoft Visual Studio** (there even is an [issue label](https://github.com/nlohmann/json/issues?utf8=✓&q=label%3A%22visual+studio%22+) for these kind of bugs). I understand that even in 2016, complete C++11 support isn't there yet. But please also understand that I do not want to drop features or uglify the code just to make Microsoft's sub-standard compiler happy. The past has shown that there are ways to express the functionality such that the code compiles with the most recent MSVC - unfortunately, this is not the main objective of the project.
-- Please refrain from proposing changes that would **break [JSON](https://json.org) conformance**. If you propose a conformant extension of JSON to be supported by the library, please motivate this extension.
-  - We shall not extend the library to **support comments**. There is quite some [controversy](https://www.reddit.com/r/programming/comments/4v6chu/why_json_doesnt_support_comments_douglas_crockford/) around this topic, and there were quite some [issues](https://github.com/nlohmann/json/issues/376) on this. We believe that JSON is fine without comments.
-  - We do not preserve the **insertion order of object elements**. The [JSON standard](https://tools.ietf.org/html/rfc8259.html) defines objects as "an unordered collection of zero or more name/value pairs". To this end, this library does not preserve insertion order of name/value pairs. (In fact, keys will be traversed in alphabetical order as `std::map` with `std::less` is used by default.) Note this behavior conforms to the standard, and we shall not change it to any other order. If you do want to preserve the insertion order, you can specialize the object type with containers like [`tsl::ordered_map`](https://github.com/Tessil/ordered-map) or [`nlohmann::fifo_map`](https://github.com/nlohmann/fifo_map).
+This library is primarily maintained as a spare-time project. As such, I cannot make any guarantee how quickly changes
+are merged and released. Therefore, it is very important to make the review as smooth as possible by explaining not only
+_what_ you changed, but _why_. This rationale can be very valuable down the road when improvements or bugs are discussed
+years later.
 
-- Please do not open pull requests that address **multiple issues**.
+### Reference an existing issue
+
+[Link a pull request to an issue](https://docs.github.com/en/issues/tracking-your-work-with-issues/using-issues/linking-a-pull-request-to-an-issue)
+to clarify that a fix is forthcoming and which issue can be closed after merging. Only a few cases (e.g., fixing typos)
+do not require prior discussions.
+
+### Write tests
+
+The library has an extensive test suite that currently covers [100 %](https://coveralls.io/github/nlohmann/json) of the
+library's code. These tests are crucial to maintain API stability and give future contributors confidence that they do
+not accidentally break things. As Titus Winters aptly put it:
+
+> If you liked it, you should have put a test on it.
+
+#### Run the tests
+
+First, ensure the test suite runs before making any changes:
+
+```sh
+$ cmake -S. -B build
+$ cmake --build build -j 10
+$ ctest --test-dir build -j 10
+```
+
+The test suite should report:
+
+```
+100% tests passed, 0 tests failed out of 98
+```
+
+#### Add tests
+
+The tests are located in [`tests/src/unit-*.cpp`](https://github.com/nlohmann/json/tree/develop/tests/src) and contain
+[doctest assertions](https://github.com/doctest/doctest/blob/master/doc/markdown/assertions.md) like `CHECK`. The tests
+are structured along the features of the library or the nature of the tests. Usually, it should be clear from the
+context which existing file needs to be extended, and only very few cases require creating new test files.
+
+When fixing a bug, edit `unit-regression2.cpp` and add a section referencing the fixed issue.
+
+#### Exceptions
+
+When you test exceptions, please use `CHECK_THROWS_WITH_AS` which also takes the `what()` argument of the thrown
+exception into account.
+
+#### Coverage
+
+If test coverage decreases, an automatic warning comment will be posted on the pull request. You can access a code
+coverage report as an artifact to the “Ubuntu” workflow.
+
+### Update the documentation
+
+The [main documentation](https://json.nlohmann.me) of the library is generated from the files
+[`docs/mkdocs/docs`](https://github.com/nlohmann/json/blob/develop/docs/mkdocs/docs). This folder contains dedicated
+pages for [certain features](https://github.com/nlohmann/json/tree/develop/docs/mkdocs/docs/features), a list of
+[all exceptions](https://github.com/nlohmann/json/blob/develop/docs/mkdocs/docs/home/exceptions.md), and 
+[extensive API documentation](https://github.com/nlohmann/json/tree/develop/docs/mkdocs/docs/api) with details on every
+public API function.
+
+Build the documentation locally using:
+
+```shell
+make install_venv -C docs/mkdocs
+make serve -C docs/mkdocs
+```
+
+The documentation will then be available at <http://127.0.0.1:8000/>. See the documentation of
+[mkdocs](https://www.mkdocs.org) and [Material for MkDocs](https://squidfunk.github.io/mkdocs-material/) for more
+information.
+
+### Amalgamate the source code
+
+The single-header files
+[`single_include/nlohmann/json.hpp`](https://github.com/nlohmann/json/blob/develop/single_include/nlohmann/json.hpp) and
+[`single_include/nlohmann/json_fwd.hpp`](https://github.com/nlohmann/json/blob/develop/single_include/nlohmann/json_fwd.hpp)
+are **generated** from the source files in the
+[`include/nlohmann` directory](https://github.com/nlohmann/json/tree/develop/include/nlohmann). **Do not** edit the
+files directly; instead, modify the include/nlohmann sources and regenerate the files by executing:
+
+```shell
+make amalgamate
+```
+
+Running `make amalgamate` will also apply automatic formatting to the source files using
+[`Artistic Style`](https://astyle.sourceforge.net/). This formatting may modify your source files in-place. Be certain to review and commit any changes to avoid unintended formatting diffs in commits.
+
+## Recommended documentation
+
+- The library’s [README file](https://github.com/nlohmann/json/blob/master/README.md) is an excellent starting point to
+  understand its functionality.
+- The [documentation page](https://json.nlohmann.me) is the reference documentation of the library.
+- [RFC 8259](https://datatracker.ietf.org/doc/html/rfc8259) is the reference for the JavaScript Object Notation (JSON)
+  Data Interchange Format.
+
+## Please don't...
+
+Certain contributions are not helpful.
+
+### Break the public API
+
+We take pride in the library being used by
+[numerous customers across various industries](https://json.nlohmann.me/home/customers/). They all rely on the
+guarantees provided by [semantic versioning](https://semver.org). Please do not change the library such that the public
+API of the 3.x.y version is broken. This includes:
+
+- Changing function signatures (altering parameter types, return types, number of parameters) or changing the const-ness
+  of member functions.
+- Removing functions.
+- Renaming functions or classes.
+- Changing exception handling.
+- Changing exception ids.
+- Changing access specifiers.
+- Changing default arguments.
+
+Although these guidelines may seem restrictive, they are essential for maintaining the library’s utility.
+
+Breaking changes may be introduced when they are guarded with a feature macro such as
+[`JSON_USE_IMPLICIT_CONVERSIONS`](https://json.nlohmann.me/api/macros/json_use_implicit_conversions/) which allows 
+selectively changing the behavior of the library. In next steps, the current behavior can then be deprecated. Using
+feature macros then allows users to test their code against the library in the next major release.
+
+### Break C++11 language conformance
+
+This library is designed to work with C++11 and later. This means that any
+[supported C++11 compiler](https://github.com/nlohmann/json/blob/master/README.md#supported-compilers) should compile
+the library without problems. Some compilers like GCC 4.7 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual
+Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support.
+
+Please do not add features that do not work with the mentioned supported compilers. Please guard features from C++14 and
+later against the respective [`JSON_HAS_CPP_14`](https://json.nlohmann.me/api/macros/json_has_cpp_11/) macros.
+
+### Break JSON conformance
+
+Please refrain from proposing changes that would **break [JSON](https://datatracker.ietf.org/doc/html/rfc8259)
+conformance**. If you propose a conformant extension of JSON to be supported by the library, please motivate this
+extension.
 
 ## Wanted
 
-The following areas really need contribution:
+The following areas really need contribution and are always welcomed:
 
-- Extending the **continuous integration** toward more exotic compilers such as Android NDK, Intel's Compiler, or the bleeding-edge versions Clang.
-- Improving the efficiency of the **JSON parser**. The current parser is implemented as a naive recursive descent parser with hand coded string handling. More sophisticated approaches like LALR parsers would be really appreciated. That said, parser generators like Bison or ANTLR do not play nice with single-header files -- I really would like to keep the parser inside the `json.hpp` header, and I am not aware of approaches similar to [`re2c`](http://re2c.org) for parsing.
-- Extending and updating existing **benchmarks** to include (the most recent version of) this library. Though efficiency is not everything, speed and memory consumption are very important characteristics for C++ developers, so having proper comparisons would be interesting.
+- Extending the **continuous integration** toward more exotic compilers such as Android NDK, Intel's Compiler, or the
+  bleeding-edge versions Clang.
+- Improving the efficiency of the **JSON parser**. The current parser is implemented as a naive recursive descent parser
+  with hand-coded string handling. More sophisticated approaches like LALR parsers would be really appreciated. That
+  said, parser generators like Bison or ANTLR do not play nice with single-header files -- I really would like to keep
+  the parser inside the `json.hpp` header, and I am not aware of approaches similar to [`re2c`](http://re2c.org) for
+  parsing.
+- Extending and updating existing **benchmarks** to include (the most recent version of) this library. Though efficiency
+  is not everything, speed and memory consumption are very important characteristics for C++ developers, so having
+  proper comparisons would be interesting.
+
+We look forward to your contributions and collaboration to enhance the library!

.github/FUNDING.yml

@@ -1,2 +1,2 @@
 github: nlohmann
-custom: http://paypal.me/nlohmann
+custom: https://paypal.me/nlohmann

.github/ISSUE_TEMPLATE/bug.yaml

@@ -13,7 +13,9 @@ body:
         
         Note that this form is for bug reports only. Please
         [open a discussion](https://github.com/nlohmann/json/discussions/new)
-        for questions, feature requests, or support requests
+        for questions, feature requests, or support requests.
+        **Please check the [FAQ](https://json.nlohmann.me/home/faq/) before
+        reporting an issue.** Common questions are answered there.        
   - type: textarea
     id: summary
     attributes:
@@ -76,7 +78,7 @@ body:
       label: Library version
       description: >
         Which version of the library did you use? If it is a released version,
-        please enter the version number (e.g., 3.11.2). Otherwise, please enter
+        please enter the version number (e.g., 3.12.0). Otherwise, please enter
         the commit hash. If you got the library from another source as the
         GitHub repository (e.g., via a package manager), please also state
         this.

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,19 +1,9 @@
-[Describe your pull request here. Please read the text below the line, and make sure you follow the checklist.]
+[Describe your pull request here. Please read the text below the line and make sure you follow the checklist.]
 
-* * *
-
-## Pull request checklist
+- [ ] The changes are described in detail, both the what and why.
+- [ ] If applicable, an [existing issue](https://github.com/nlohmann/json/issues) is referenced.
+- [ ] The [Code coverage](https://coveralls.io/github/nlohmann/json) remained at 100%. A test case for every new line of code.
+- [ ] If applicable, the [documentation](https://json.nlohmann.me) is updated.
+- [ ] The source code is amalgamated by running `make amalgamate`.
 
 Read the [Contribution Guidelines](https://github.com/nlohmann/json/blob/develop/.github/CONTRIBUTING.md) for detailed information.
-
-- [ ]  Changes are described in the pull request, or an [existing issue is referenced](https://github.com/nlohmann/json/issues).
-- [ ]  The test suite [compiles and runs](https://github.com/nlohmann/json/blob/develop/README.md#execute-unit-tests) without error.
-- [ ]  [Code coverage](https://coveralls.io/github/nlohmann/json) is 100%. Test cases can be added by editing the [test suite](https://github.com/nlohmann/json/tree/develop/test/src).
-- [ ]  The source code is amalgamated; that is, after making changes to the sources in the `include/nlohmann` directory, run `make amalgamate` to create the single-header files `single_include/nlohmann/json.hpp` and `single_include/nlohmann/json_fwd.hpp`. The whole process is described [here](https://github.com/nlohmann/json/blob/develop/.github/CONTRIBUTING.md#files-to-change).
-
-## Please don't
-
-- The C++11 support varies between different **compilers** and versions. Please note the [list of supported compilers](https://github.com/nlohmann/json/blob/master/README.md#supported-compilers). Some compilers like GCC 4.7 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support. Please refrain from proposing changes that work around these compiler's limitations with `#ifdef`s or other means.
-- Specifically, I am aware of compilation problems with **Microsoft Visual Studio** (there even is an [issue label](https://github.com/nlohmann/json/issues?utf8=✓&q=label%3A%22visual+studio%22+) for these kind of bugs). I understand that even in 2016, complete C++11 support isn't there yet. But please also understand that I do not want to drop features or uglify the code just to make Microsoft's sub-standard compiler happy. The past has shown that there are ways to express the functionality such that the code compiles with the most recent MSVC - unfortunately, this is not the main objective of the project.
-- Please refrain from proposing changes that would **break [JSON](https://json.org) conformance**. If you propose a conformant extension of JSON to be supported by the library, please motivate this extension.
-- Please do not open pull requests that address **multiple issues**.

.github/SECURITY.md

@@ -2,4 +2,24 @@
 
 ## Reporting a Vulnerability
 
-Usually, all issues are tracked publicly on [GitHub](https://github.com/nlohmann/json/issues). If you want to make a private report (e.g., for a vulnerability or to attach an example that is not meant to be published), please send an email to <mail@nlohmann.me>. You can use [this key](https://keybase.io/nlohmann/pgp_keys.asc?fingerprint=797167ae41c0a6d9232e48457f3cea63ae251b69) for encryption.
+We value the security of our users and appreciate your efforts to responsibly disclose vulnerabilities. If you have
+identified a security vulnerability in this repository, please use the GitHub Security Advisory
+["Report a Vulnerability"](https://github.com/nlohmann/json/security/advisories/new) tab.
+
+Until it is published, this draft security advisory will only be visible to the maintainers of this project. Other
+users and teams may be added once the advisory is created.
+
+We will send a response indicating the next steps in handling your report. After the initial reply to your report, we
+will keep you informed of the progress towards a fix and full announcement and may ask for additional information or
+guidance.
+
+For vulnerabilities in third-party dependencies or modules, please report them directly to the respective maintainers.
+
+## Additional Resources
+
+- Explore security-related topics and contribute to tools and projects through
+  [GitHub Security Lab](https://securitylab.github.com/).
+- Learn more about responsible disclosure and reporting vulnerabilities in GitHub at
+  [About coordinated disclosure of security vulnerabilities](https://docs.github.com/en/code-security/repository-security-advisories/about-coordinated-disclosure-of-security-vulnerabilities).
+
+We sincerely thank you for contributing to the security and integrity of this project!

.github/config.yml

@@ -6,7 +6,7 @@ sentimentBotToxicityThreshold: .7
 
 # *Required* Comment to reply with
 sentimentBotReplyComment: >
-  Please be sure to review the [code of conduct](https://github.com/nlohmann/json/blob/develop/CODE_OF_CONDUCT.md) and be respectful of other users. cc/ @nlohmann
+  Please be sure to review the [code of conduct](https://github.com/nlohmann/json/blob/develop/.github/CODE_OF_CONDUCT.md) and be respectful of other users. cc/ @nlohmann
 
 
 # Configuration for request-info - https://github.com/behaviorbot/request-info
@@ -17,3 +17,6 @@ requestInfoReplyComment: >
 
 # *OPTIONAL* Label to be added to Issues and Pull Requests with insufficient information given
 requestInfoLabelToAdd: "state: needs more info"
+
+checkIssueTemplate: true
+checkPullRequestTemplate: true

.github/dependabot.yml

@@ -0,0 +1,31 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: daily
+
+  - package-ecosystem: pip
+    directory: /docs/mkdocs
+    schedule:
+      interval: daily
+
+  - package-ecosystem: pip
+    directory: /tools/astyle
+    schedule:
+      interval: daily
+
+  - package-ecosystem: pip
+    directory: /tools/generate_natvis
+    schedule:
+      interval: daily
+
+  - package-ecosystem: pip
+    directory: /tools/serve_header
+    schedule:
+      interval: daily
+
+  - package-ecosystem: pip
+    directory: /cmake/requirements
+    schedule:
+      interval: daily

.github/external_ci/appveyor.yml

@@ -41,7 +41,7 @@ environment:
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
       configuration: Release
       platform: x86
-      CXX_FLAGS: "/permissive- /std:c++latest /utf-8 /W4 /WX"
+      CXX_FLAGS: "/permissive- /std:c++17 /utf-8 /W4 /WX"
       CMAKE_OPTIONS: ""
       GENERATOR: Visual Studio 15 2017
 
@@ -62,7 +62,7 @@ environment:
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
       configuration: Release
       platform: x64
-      CXX_FLAGS: "/permissive- /std:c++latest /Zc:__cplusplus /utf-8 /W4 /WX"
+      CXX_FLAGS: "/permissive- /std:c++17 /Zc:__cplusplus /utf-8 /W4 /WX"
       CMAKE_OPTIONS: ""
       GENERATOR: Visual Studio 15 2017
 

.github/stale.yml

@@ -1,17 +0,0 @@
-# Number of days of inactivity before an issue becomes stale
-daysUntilStale: 30
-# Number of days of inactivity before a stale issue is closed
-daysUntilClose: 7
-# Issues with these labels will never be considered stale
-exemptLabels:
-  - pinned
-  - security
-# Label to use when marking an issue as stale
-staleLabel: "state: stale"
-# Comment to post when marking an issue as stale. Set to `false` to disable
-markComment: >
-  This issue has been automatically marked as stale because it has not had
-  recent activity. It will be closed if no further activity occurs. Thank you
-  for your contributions.
-# Comment to post when closing a stale issue. Set to `false` to disable
-closeComment: false

.github/workflows/check_amalgamation.yml

@@ -0,0 +1,76 @@
+name: "Check amalgamation"
+
+on:
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  save:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: Save PR number
+        run: |
+          mkdir -p ./pr
+          echo ${{ github.event.number }} > ./pr/number
+          echo ${{ github.event.pull_request.user.login }} > ./pr/author
+      - uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
+        with:
+          name: pr
+          path: pr/
+
+  check:
+    runs-on: ubuntu-latest
+    env:
+      MAIN_DIR: ${{ github.workspace }}/main
+      INCLUDE_DIR: ${{ github.workspace }}/main/single_include/nlohmann
+      TOOL_DIR: ${{ github.workspace }}/tools/tools/amalgamate
+
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: Checkout pull request
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          path: main
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - name: Checkout tools
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          path: tools
+          ref: develop
+
+      - name: Install astyle
+        run: |
+          python3 -mvenv venv
+          venv/bin/pip3 install -r $MAIN_DIR/tools/astyle/requirements.txt
+
+      - name: Check amalgamation
+        run: |
+          cd $MAIN_DIR
+
+          rm -fr $INCLUDE_DIR/json.hpp~ $INCLUDE_DIR/json_fwd.hpp~
+          cp $INCLUDE_DIR/json.hpp $INCLUDE_DIR/json.hpp~
+          cp $INCLUDE_DIR/json_fwd.hpp $INCLUDE_DIR/json_fwd.hpp~
+
+          python3 $TOOL_DIR/amalgamate.py -c $TOOL_DIR/config_json.json -s .
+          python3 $TOOL_DIR/amalgamate.py -c $TOOL_DIR/config_json_fwd.json -s .
+          echo "Format (1)"
+          ${{ github.workspace }}/venv/bin/astyle --project=tools/astyle/.astylerc --suffix=none --quiet $INCLUDE_DIR/json.hpp $INCLUDE_DIR/json_fwd.hpp
+
+          diff $INCLUDE_DIR/json.hpp~ $INCLUDE_DIR/json.hpp
+          diff $INCLUDE_DIR/json_fwd.hpp~ $INCLUDE_DIR/json_fwd.hpp
+
+          ${{ github.workspace }}/venv/bin/astyle --project=tools/astyle/.astylerc --suffix=orig $(find docs/examples include tests -type f \( -name '*.hpp' -o -name '*.cpp' -o -name '*.cu' \) -not -path 'tests/thirdparty/*' -not -path 'tests/abi/include/nlohmann/*' | sort)
+          echo Check
+          find $MAIN_DIR -name '*.orig' -exec false {} \+

.github/workflows/cifuzz.yml

@@ -0,0 +1,35 @@
+name: CIFuzz
+on: [pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  Fuzzing:
+    runs-on: ubuntu-22.04
+    steps:
+    - name: Harden Runner
+      uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+      with:
+        egress-policy: audit
+
+    - name: Build Fuzzers
+      id: build
+      uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@master
+      with:
+        oss-fuzz-project-name: 'json'
+        dry-run: false
+        language: c++
+    - name: Run Fuzzers
+      uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@master
+      with:
+        oss-fuzz-project-name: 'json'
+        fuzz-seconds: 300
+        dry-run: false
+        language: c++
+    - name: Upload Crash
+      uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
+      if: failure() && steps.build.outcome == 'success'
+      with:
+        name: artifacts
+        path: ./out/artifacts

.github/workflows/codeql-analysis.yml

@@ -10,28 +10,40 @@ on:
   schedule:
     - cron: '0 19 * * 1'
   workflow_dispatch:
-
+  
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   CodeQL-Build:
 
     runs-on: ubuntu-latest
+    permissions:
+      security-events: write
 
     steps:
+    - name: Harden Runner
+      uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+      with:
+        egress-policy: audit
+
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v2
+      uses: github/codeql-action/init@9e907b5e64f6b83e7804b09294d44122997950d6 # v4.32.3
+      with:
+        languages: c-cpp
 
     # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
     # If this step fails, then you should remove it and run the build manually (see below)
     - name: Autobuild
-      uses: github/codeql-action/autobuild@v2
+      uses: github/codeql-action/autobuild@9e907b5e64f6b83e7804b09294d44122997950d6 # v4.32.3
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v2
+      uses: github/codeql-action/analyze@9e907b5e64f6b83e7804b09294d44122997950d6 # v4.32.3

.github/workflows/comment_check_amalgamation.yml

@@ -0,0 +1,81 @@
+name: Comment Check Amalgamation
+on:
+  workflow_run:
+    workflows: ["Check amalgamation"]
+    types:
+      - completed
+
+permissions:
+  contents: read
+
+jobs:
+  comment:
+    if: ${{ github.event.workflow_run.conclusion == 'failure' }}
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      actions: read
+      issues: read
+      pull-requests: write
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: 'Download artifact'
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        with:
+          script: |
+            var artifacts = await github.rest.actions.listWorkflowRunArtifacts({
+               owner: context.repo.owner,
+               repo: context.repo.repo,
+               run_id: ${{github.event.workflow_run.id }},
+            });
+            var matchArtifact = artifacts.data.artifacts.filter((artifact) => {
+              return artifact.name == "pr"
+            })[0];
+            var download = await github.rest.actions.downloadArtifact({
+               owner: context.repo.owner,
+               repo: context.repo.repo,
+               artifact_id: matchArtifact.id,
+               archive_format: 'zip',
+            });
+            var fs = require('fs');
+            fs.writeFileSync('${{github.workspace}}/pr.zip', Buffer.from(download.data));
+      - run: unzip pr.zip
+
+      - name: 'Comment on PR'
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            var fs = require('fs');
+            const author = fs.readFileSync('./author')
+            const issue_number = Number(fs.readFileSync('./number'));
+            const opts = github.rest.issues.listForRepo.endpoint.merge({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              creator: author,
+              state: 'all'
+            })
+            let first = true
+            const issues = await github.paginate(opts)
+            for (const issue of issues) {
+              if (issue.number === issue_number) {
+                continue
+              }
+              if (issue.pull_request) {
+                first = false
+                break
+              }
+            }
+            await github.rest.issues.createComment({
+              issue_number: issue_number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: '## 🔴 Amalgamation check failed! 🔴\nThe source code has not been amalgamated.'
+                    + (first ? ' @' + author + ' Please read and follow the [Contribution Guidelines]'
+                               + '(https://github.com/nlohmann/json/blob/develop/.github/CONTRIBUTING.md#files-to-change).'
+                             : '')
+              })

.github/workflows/dependency-review.yml

@@ -0,0 +1,27 @@
+# Dependency Review Action
+#
+# This Action will scan dependency manifest files that change as part of a Pull Request,
+# surfacing known-vulnerable versions of the packages declared or updated in the PR.
+# Once installed, if the workflow run is marked as required,
+# PRs introducing known-vulnerable packages will be blocked from merging.
+#
+# Source repository: https://github.com/actions/dependency-review-action
+name: 'Dependency Review'
+on: [pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  dependency-review:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: 'Checkout Repository'
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: 'Dependency Review'
+        uses: actions/dependency-review-action@3c4e3dcb1aa7874d2c16be7d79418e9b7efd6261 # v4.8.2

.github/workflows/flawfinder.yml

@@ -0,0 +1,46 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: flawfinder
+
+permissions:
+  contents: read
+
+on:
+  push:
+    branches: [ "develop" ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ "develop" ]
+  schedule:
+    - cron: '41 14 * * 3'
+
+jobs:
+  flawfinder:
+    name: Flawfinder
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: flawfinder_scan
+        uses: david-a-wheeler/flawfinder@c57197cd6061453f10a496f30a732bc1905918d1 # v2.0.19
+        with:
+          arguments: '--sarif ./'
+          output: 'flawfinder_results.sarif'
+
+      - name: Upload analysis results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@9e907b5e64f6b83e7804b09294d44122997950d6 # v4
+        with:
+          sarif_file: ${{github.workspace}}/flawfinder_results.sarif

.github/workflows/labeler.yml

@@ -4,6 +4,9 @@ on:
   pull_request_target:
     types: [opened, synchronize]
 
+permissions:
+  contents: read
+
 jobs:
   label:
     permissions:
@@ -13,6 +16,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: srvaroa/labeler@master
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - uses: srvaroa/labeler@471cdb892ebac76de6cb869105a2017fa3b9b9b3 # master
         env:
           GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"

.github/workflows/macos.yml

@@ -13,17 +13,74 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
-  xcode_1:
-    runs-on: macos-11
+# macos-11 is deprecated
+#  macos-11:
+#    runs-on: macos-11
+#    strategy:
+#      matrix:
+#        xcode: ['11.7', '12.4', '12.5.1', '13.0']
+#    env:
+#      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+#
+#    steps:
+#      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+#      - name: Run CMake
+#        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
+#      - name: Build
+#        run: cmake --build build --parallel 10
+#      - name: Test
+#        run: cd build ; ctest -j 10 --output-on-failure
+
+# macos-12 is deprecated (https://github.com/actions/runner-images/issues/10721)
+#  macos-12:
+#    runs-on: macos-12 # https://github.com/actions/runner-images/blob/main/images/macos/macos-12-Readme.md
+#    strategy:
+#      matrix:
+#        xcode: ['13.1', '13.2.1', '13.3.1', '13.4.1', '14.0', '14.0.1', '14.1']
+#    env:
+#      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+#
+#    steps:
+#      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+#      - name: Run CMake
+#        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
+#      - name: Build
+#        run: cmake --build build --parallel 10
+#      - name: Test
+#        run: cd build ; ctest -j 10 --output-on-failure
+
+# macos-13 is deprecated (https://github.com/actions/runner-images/issues/13046)
+#  macos-13:
+#    runs-on: macos-13 # https://github.com/actions/runner-images/blob/main/images/macos/macos-13-Readme.md
+#    strategy:
+#      matrix:
+#        xcode: ['14.1', '14.2', '14.3', '14.3.1', '15.0.1', '15.1', '15.2']
+#    env:
+#      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+#
+#    steps:
+#      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+#      - name: Run CMake
+#        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
+#      - name: Build
+#        run: cmake --build build --parallel 10
+#      - name: Test
+#        run: cd build ; ctest -j 10 --output-on-failure
+
+  macos-14:
+    runs-on: macos-14 # https://github.com/actions/runner-images/blob/main/images/macos/macos-14-Readme.md
     strategy:
       matrix:
-        xcode: ['11.7', '12.4', '12.5.1', '13.0']
+        xcode: ['15.0.1', '15.1', '15.2', '15.3', '15.4']
     env:
       DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Run CMake
         run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
       - name: Build
@@ -31,16 +88,16 @@ jobs:
       - name: Test
         run: cd build ; ctest -j 10 --output-on-failure
 
-  xcode_2:
-    runs-on: macos-12
+  macos-15:
+    runs-on: macos-15 # https://github.com/actions/runner-images/blob/main/images/macos/macos-15-Readme.md
     strategy:
       matrix:
-        xcode: ['13.1', '13.2.1', '13.3.1', '13.4.1']
+        xcode: ['16.0', '16.1', '16.2', '16.3', '16.4', '26.0.1']
     env:
       DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Run CMake
         run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
       - name: Build
@@ -52,12 +109,10 @@ jobs:
     runs-on: macos-latest
     strategy:
       matrix:
-        standard: [11, 14, 17, 20]
-    env:
-      DEVELOPER_DIR: /Applications/Xcode_12.4.app/Contents/Developer
+        standard: [11, 14, 17, 20, 23, 26]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Run CMake
         run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_TestStandards=${{ matrix.standard }}
       - name: Build

.github/workflows/publish_documentation.yml

@@ -15,18 +15,32 @@ concurrency:
   group: documentation
   cancel-in-progress: false
 
+permissions:
+  contents: read
+
 jobs:
   publish_documentation:
+    permissions:
+      contents: write
+
     if: github.repository == 'nlohmann/json'
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v3
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
 
-      - name: Install and update PlantUML
-        run: sudo apt-get update ; sudo apt-get install -y plantuml
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Install virtual environment
         run: make install_venv -C docs/mkdocs
 
-      - name: Publish documentation
-        run: make publish -C docs/mkdocs
+      - name: Build documentation
+        run: make build -C docs/mkdocs
+
+      - name: Deploy documentation
+        uses: peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e # v4.0.0
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./docs/mkdocs/site

.github/workflows/scorecards.yml

@@ -0,0 +1,81 @@
+# This workflow uses actions that are not certified by GitHub. They are provided
+# by a third-party and are governed by separate terms of service, privacy
+# policy, and support documentation.
+
+name: Scorecard supply-chain security
+on:
+  # For Branch-Protection check. Only the default branch is supported. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#branch-protection
+  branch_protection_rule:
+  # To guarantee Maintained check is occasionally updated. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#maintained
+  schedule:
+    - cron: '20 7 * * 2'
+  push:
+    branches: ["develop"]
+
+permissions:
+  contents: read
+
+jobs:
+  analysis:
+    name: Scorecard analysis
+    runs-on: ubuntu-latest
+    permissions:
+      # Needed to upload the results to code-scanning dashboard.
+      security-events: write
+      # Needed to publish results and get a badge (see publish_results below).
+      id-token: write
+      contents: read
+      actions: read
+      # To allow GraphQL ListCommits to work
+      issues: read
+      pull-requests: read
+      # To detect SAST tools
+      checks: read
+
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: "Checkout code"
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: "Run analysis"
+        uses: ossf/scorecard-action@4eaacf0543bb3f2c246792bd56e8cdeffafb205a # v2.4.3
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          # (Optional) "write" PAT token. Uncomment the `repo_token` line below if:
+          # - you want to enable the Branch-Protection check on a *public* repository, or
+          # - you are installing Scorecards on a *private* repository
+          # To create the PAT, follow the steps in https://github.com/ossf/scorecard-action#authentication-with-pat.
+          # repo_token: ${{ secrets.SCORECARD_TOKEN }}
+
+          # Public repositories:
+          #   - Publish results to OpenSSF REST API for easy access by consumers
+          #   - Allows the repository to include the Scorecard badge.
+          #   - See https://github.com/ossf/scorecard-action#publishing-results.
+          # For private repositories:
+          #   - `publish_results` will always be set to `false`, regardless
+          #     of the value entered here.
+          publish_results: true
+
+      # Upload the results as artifacts (optional). Commenting out will disable uploads of run results in SARIF
+      # format to the repository Actions tab.
+      - name: "Upload artifact"
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
+        with:
+          name: SARIF file
+          path: results.sarif
+          retention-days: 5
+
+      # Upload the results to GitHub's code scanning dashboard.
+      - name: "Upload to code-scanning"
+        uses: github/codeql-action/upload-sarif@9e907b5e64f6b83e7804b09294d44122997950d6 # v4.32.3
+        with:
+          sarif_file: results.sarif

.github/workflows/semgrep.yml

@@ -0,0 +1,54 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+# This workflow file requires a free account on Semgrep.dev to
+# manage rules, file ignores, notifications, and more.
+#
+# See https://semgrep.dev/docs
+
+name: Semgrep
+
+on:
+  push:
+    branches: [ "develop" ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ "develop" ]
+  schedule:
+    - cron: '23 2 * * 4'
+
+permissions:
+  contents: read
+
+jobs:
+  semgrep:
+    permissions:
+      contents: read # for actions/checkout to fetch code
+      security-events: write # for github/codeql-action/upload-sarif to upload SARIF results
+      actions: read # only required for a private repository by github/codeql-action/upload-sarif to get the Action run status
+    name: Scan
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      # Checkout project source
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      # Scan code using project's configuration on https://semgrep.dev/manage
+      - uses: returntocorp/semgrep-action@713efdd345f3035192eaa63f56867b88e63e4e5d
+        with:
+          publishToken: ${{ secrets.SEMGREP_APP_TOKEN }}
+          publishDeployment: ${{ secrets.SEMGREP_DEPLOYMENT_ID }}
+          generateSarif: "1"
+
+      # Upload SARIF file generated in previous step
+      - name: Upload SARIF file
+        uses: github/codeql-action/upload-sarif@9e907b5e64f6b83e7804b09294d44122997950d6 # v4
+        with:
+          sarif_file: semgrep.sarif
+        if: always()

.github/workflows/stale.yml

@@ -0,0 +1,34 @@
+name: 'Comment and close stale issues and PR'
+on:
+  schedule:
+    - cron: '0 0 * * *'
+
+permissions:
+  contents: read
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+
+    permissions:
+      issues: write
+      pull-requests: write
+
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - uses: actions/stale@997185467fa4f803885201cee163a9f38240193d # v10.1.1
+        with:
+          stale-issue-label: 'state: stale'
+          stale-pr-label: 'state: stale'
+          exempt-issue-labels: 'pinned,security'
+          stale-issue-message: 'This issue has been marked as stale because it has been open for 90 days without activity. If this issue is still relevant, please add a comment or remove the "stale" label. Otherwise, it will be closed in 10 days. Thank you for helping us prioritize our work!'
+          stale-pr-message: 'This pull request has been marked as stale because it has had no activity for 30 days. While we won’t close it automatically, we encourage you to update or comment if it is still relevant. Keeping pull requests active and up-to-date helps us review and merge changes more efficiently. Thank you for your contributions!'
+          close-issue-message: 'This issue has been closed after being marked as stale for 10 days without any further activity. If this was done in error or the issue is still relevant, please feel free to reopen it or create a new issue. We appreciate your understanding and contributions.'
+          days-before-stale: 90
+          days-before-pr-stale: 30
+          days-before-close: 10
+          days-before-pr-close: -1

.github/workflows/ubuntu.yml

@@ -9,62 +9,86 @@ on:
   pull_request:
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
   cancel-in-progress: true
 
 jobs:
-  ci_test_clang:
-    runs-on: ubuntu-latest
-    container: ghcr.io/nlohmann/json-ci:v2.4.0
-    steps:
-      - uses: actions/checkout@v3
-      - name: Run CMake
-        run: cmake -S . -B build -DJSON_CI=On
-      - name: Build
-        run: cmake --build build --target ci_test_clang
-
   ci_test_gcc:
     runs-on: ubuntu-latest
-    container: ghcr.io/nlohmann/json-ci:v2.4.0
+    container: gcc:latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
       - name: Run CMake
         run: cmake -S . -B build -DJSON_CI=On
       - name: Build
         run: cmake --build build --target ci_test_gcc
 
-  ci_static_analysis:
+  ci_infer:
     runs-on: ubuntu-latest
     container: ghcr.io/nlohmann/json-ci:v2.4.0
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ci_infer
+
+  ci_static_analysis_ubuntu:
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        target: [ci_clang_tidy, ci_cppcheck, ci_test_valgrind, ci_test_clang_sanitizer, ci_test_amalgamation, ci_clang_analyze, ci_cpplint, ci_cmake_flags, ci_single_binaries, ci_reproducible_tests, ci_non_git_tests, ci_offline_testdata, ci_infer]
+        target: [ci_test_amalgamation, ci_test_single_header, ci_cppcheck, ci_cpplint, ci_reproducible_tests, ci_non_git_tests, ci_offline_testdata, ci_reuse_compliance, ci_test_valgrind]
     steps:
-      - uses: actions/checkout@v3
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: Install Valgrind
+        run: sudo apt-get update ; sudo apt-get install -y valgrind
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
       - name: Run CMake
         run: cmake -S . -B build -DJSON_CI=On
       - name: Build
         run: cmake --build build --target ${{ matrix.target }}
 
-  ci_test_single_header:
+  ci_static_analysis_clang:
     runs-on: ubuntu-latest
-    container: ghcr.io/nlohmann/json-ci:v2.4.0
+    container: silkeh/clang:dev
+    strategy:
+      matrix:
+        target: [ci_test_clang, ci_clang_tidy, ci_test_clang_sanitizer, ci_clang_analyze, ci_single_binaries]
     steps:
-      - uses: actions/checkout@v3
+      - name: Install git, clang-tools, iwyu (ci_single_binaries), and unzip
+        run: apt-get update ; apt-get install -y git clang-tools iwyu unzip
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
       - name: Run CMake
         run: cmake -S . -B build -DJSON_CI=On
       - name: Build
-        run: cmake --build build --target ci_test_single_header
+        run: cmake --build build --target ${{ matrix.target }}
 
   ci_cmake_options:
     runs-on: ubuntu-latest
-    container: ghcr.io/nlohmann/json-ci:v2.4.0
+    container: ubuntu:focal
     strategy:
       matrix:
-        target: [ci_test_diagnostics, ci_test_noexceptions, ci_test_noimplicitconversions, ci_test_legacycomparison, ci_test_noglobaludls]
+        target: [ci_cmake_flags, ci_test_diagnostics, ci_test_diagnostic_positions, ci_test_noexceptions, ci_test_noimplicitconversions, ci_test_legacycomparison, ci_test_noglobaludls]
     steps:
-      - uses: actions/checkout@v3
+      - name: Install build-essential
+        run: apt-get update ; apt-get install -y build-essential unzip wget git libssl-dev
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
       - name: Run CMake
         run: cmake -S . -B build -DJSON_CI=On
       - name: Build
@@ -72,66 +96,150 @@ jobs:
 
   ci_test_coverage:
     runs-on: ubuntu-latest
-    container: ghcr.io/nlohmann/json-ci:v2.4.0
     steps:
-      - uses: actions/checkout@v3
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Install dependencies and de_DE locale
+        run: |
+          sudo apt-get clean
+          sudo apt-get update
+          sudo apt-get install -y build-essential cmake lcov ninja-build make locales gcc-multilib g++-multilib
+          sudo locale-gen de_DE
+          sudo update-locale
       - name: Run CMake
         run: cmake -S . -B build -DJSON_CI=On
       - name: Build
         run: cmake --build build --target ci_test_coverage
       - name: Archive coverage report
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
         with:
           name: code-coverage-report
           path: ${{ github.workspace }}/build/html
       - name: Publish report to Coveralls
-        uses: coverallsapp/github-action@master
+        uses: coverallsapp/github-action@5cbfd81b66ca5d10c19b062c04de0199c215fb6e # v2.3.7
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           path-to-lcov: ${{ github.workspace }}/build/json.info.filtered.noexcept
+          fail-on-error: false
 
-  ci_test_compilers:
+  ci_test_compilers_gcc_old:
     runs-on: ubuntu-latest
-    container: ghcr.io/nlohmann/json-ci:v2.4.0
     strategy:
       matrix:
-        compiler: [g++-4.8, g++-4.9, g++-5, g++-6, g++-7, g++-8, g++-9, g++-10, g++-11, clang++-3.5, clang++-3.6, clang++-3.7, clang++-3.8, clang++-3.9, clang++-4.0, clang++-5.0, clang++-6.0, clang++-7, clang++-8, clang++-9, clang++-10, clang++-11, clang++-12, clang++-13, clang++-14]
+        compiler: ['4.8', '4.9', '5', '6']
+    container: ghcr.io/nlohmann/json-ci:v2.4.0
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Run CMake
+        run: CXX=g++-${{ matrix.compiler }} cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ci_test_compiler_g++-${{ matrix.compiler }}
+
+  ci_test_compilers_gcc:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # older GCC docker images (4, 5, 6) fail to check out code
+        compiler: ['7', '8', '9', '10', '11', '12', '13', '14', '15', 'latest']
+    container: gcc:${{ matrix.compiler }}
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
       - name: Run CMake
         run: cmake -S . -B build -DJSON_CI=On
       - name: Build
-        run: cmake --build build --target ci_test_compiler_${{ matrix.compiler }}
+        run: cmake --build build --target ci_test_compiler_default
 
-  ci_test_standards:
+  ci_test_compilers_clang:
     runs-on: ubuntu-latest
-    container: ghcr.io/nlohmann/json-ci:v2.4.0
     strategy:
       matrix:
-        standard: [11, 14, 17, 20]
-        compiler: [gcc, clang]
+        compiler: ['3.4', '3.5', '3.6', '3.7', '3.8', '3.9', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15-bullseye', '16', '17', '18', '19', '20', 'latest']
+    container: silkeh/clang:${{ matrix.compiler }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
+      - name: Set env FORCE_STDCPPFS_FLAG for clang 7 / 8 / 9 / 10
+        run: echo "JSON_FORCED_GLOBAL_COMPILE_OPTIONS=-DJSON_HAS_FILESYSTEM=0;-DJSON_HAS_EXPERIMENTAL_FILESYSTEM=0" >> "$GITHUB_ENV"
+        if: ${{ matrix.compiler == '7' || matrix.compiler == '8' || matrix.compiler == '9' || matrix.compiler == '10' }}
       - name: Run CMake
         run: cmake -S . -B build -DJSON_CI=On
       - name: Build
-        run: cmake --build build --target ci_test_${{ matrix.compiler }}_cxx${{ matrix.standard }}
+        run: cmake --build build --target ci_test_compiler_default
+
+  ci_test_standards_gcc:
+    runs-on: ubuntu-latest
+    container: gcc:latest
+    strategy:
+      matrix:
+        standard: [11, 14, 17, 20, 23, 26]
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ci_test_gcc_cxx${{ matrix.standard }}
+
+  ci_test_standards_clang:
+    runs-on: ubuntu-latest
+    container: silkeh/clang:latest
+    strategy:
+      matrix:
+        standard: [11, 14, 17, 20, 23, 26]
+        stdlib: [libcxx, libstdcxx]
+    steps:
+      - name: Install git and unzip
+        run: apt-get update ; apt-get install -y git unzip
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build with libc++
+        run: cmake --build build --target ci_test_clang_libcxx_cxx${{ matrix.standard }}
+        if: ${{ matrix.stdlib == 'libcxx' }}
+      - name: Build with libstdc++
+        run: cmake --build build --target ci_test_clang_cxx${{ matrix.standard }}
+        if: ${{ matrix.stdlib == 'libstdcxx' }}
 
   ci_cuda_example:
     runs-on: ubuntu-latest
     container: ghcr.io/nlohmann/json-ci:v2.4.0
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Run CMake
         run: cmake -S . -B build -DJSON_CI=On
       - name: Build
         run: cmake --build build --target ci_cuda_example
 
+  ci_module_cpp20:
+    strategy:
+      matrix:
+        container: ['gcc:latest', 'silkeh/clang:latest']
+    runs-on: ubuntu-latest
+    container: ${{ matrix.container }}
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ci_module_cpp20
+
   ci_icpc:
     runs-on: ubuntu-latest
     container: ghcr.io/nlohmann/json-ci:v2.2.0
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Run CMake
         run: cmake -S . -B build -DJSON_CI=On
       - name: Build
@@ -139,23 +247,36 @@ jobs:
           . /opt/intel/oneapi/setvars.sh
           cmake --build build --target ci_icpc
 
-  ci_reuse_compliance:
+  ci_emscripten:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v3
-      - name: Install REUSE tool
-        run:  python -m pip install reuse
-      - name: Run REUSE lint
-        run: reuse lint
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: Install emscripten
+        uses: mymindstorm/setup-emsdk@6ab9eb1bda2574c4ddb79809fc9247783eaf9021 # v14
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
+      - name: Run CMake
+        run: cmake -S . -B build -DCMAKE_TOOLCHAIN_FILE=$EMSDK/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake -GNinja
+      - name: Build
+        run: cmake --build build
 
   ci_test_documentation:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        target: [ci_test_examples, ci_test_api_documentation]
+        target: [ci_test_examples, ci_test_build_documentation]
     steps:
-      - uses: actions/checkout@v3
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Run CMake
         run: cmake -S . -B build -DJSON_CI=On
       - name: Build

.github/workflows/windows.yml

@@ -9,44 +9,27 @@ on:
   pull_request:
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
   cancel-in-progress: true
 
 jobs:
   mingw:
-    runs-on: windows-latest
+    runs-on: windows-2022
     strategy:
       matrix:
         architecture: [x64, x86]
 
     steps:
-      - uses: actions/checkout@v3
-      - name: Download MinGW 8.1.0
-        run: |
-          $headers = @{Authorization = 'Bearer ${{ secrets.GITHUB_TOKEN }}'}
-          $uri = 'https://nuget.pkg.github.com/falbrechtskirchinger/download/mingw/8.1.0/mingw.8.1.0.nupkg'
-          Invoke-WebRequest -Uri $uri -Headers $headers -OutFile mingw.8.1.0.nupkg
-      - name: Uninstall MinGW
-        continue-on-error: true
-        run: choco uninstall mingw
-      # Based on egor-tensin/setup-mingw
-      - name: Install MinGW 8.1.0
-        run: |
-          choco install mingw.8.1.0.nupkg ${{ matrix.architecture == 'x86' && '--x86' || '' }}
-          $prefix = "${{ matrix.architecture == 'x64' && 'x86_64-w64-mingw32' || 'i686-w64-mingw32' }}"
-          $mingw = "${{ matrix.architecture == 'x64' && 'mingw64' || 'mingw32' }}"
-          $mingw_install = Join-Path C: ProgramData chocolatey lib mingw tools install
-          $mingw_root = Join-Path $mingw_install $mingw
-          $mingw_bin = Join-Path $mingw_root bin
-          $mingw_lib = Join-Path $mingw_root $prefix lib
-          echo $mingw_bin >> $env:GITHUB_PATH
-          Remove-Item (Join-Path $mingw_lib 'libpthread.dll.a')
-          Remove-Item (Join-Path $mingw_lib 'libwinpthread.dll.a')
-      #- name: Set up MinGW
-      #  uses: egor-tensin/setup-mingw@v2
-      #  with:
-      #    platform: ${{ matrix.architecture }}
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Set up MinGW
+        uses: egor-tensin/setup-mingw@41b837e47d7f85214629d255b9c4bc3fcbe9fd63 # v3.0
+        with:
+          platform: ${{ matrix.architecture }}
+          version: 12.2.0 # https://github.com/egor-tensin/setup-mingw/issues/14
       - name: Run CMake
         run: cmake -S . -B build -G "MinGW Makefiles" -DCMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On
       - name: Build
@@ -54,98 +37,88 @@ jobs:
       - name: Test
         run: cd build ; ctest -j 10 -C Debug --output-on-failure
 
-  msvc2019:
-    runs-on: windows-2019
+  msvc:
     strategy:
       matrix:
         build_type: [Debug, Release]
         architecture: [Win32, x64]
+        std_version: [default, latest]
 
-    steps:
-    - uses: actions/checkout@v3
-    - name: Run CMake
-      run: cmake -S . -B build -G "Visual Studio 16 2019" -A ${{ matrix.architecture }} -DJSON_BuildTests=On -DCMAKE_CXX_FLAGS="/W4 /WX"
-      if: matrix.build_type == 'Release'
-    - name: Run CMake
-      run: cmake -S . -B build -G "Visual Studio 16 2019" -A ${{ matrix.architecture }} -DJSON_BuildTests=On -DJSON_FastTests=ON -DCMAKE_CXX_FLAGS="/W4 /WX"
-      if: matrix.build_type == 'Debug'
-    - name: Build
-      run: cmake --build build --config ${{ matrix.build_type }} --parallel 10
-    - name: Test
-      run: cd build ; ctest -j 10 -C ${{ matrix.build_type }} --output-on-failure
-
-  msvc2019_latest:
-    runs-on: windows-2019
-
-    steps:
-    - uses: actions/checkout@v3
-    - name: Run CMake
-      run: cmake -S . -B build -G "Visual Studio 16 2019" -DJSON_BuildTests=On -DCMAKE_CXX_FLAGS="/permissive- /std:c++latest /utf-8 /W4 /WX"
-    - name: Build
-      run: cmake --build build --config Release --parallel 10
-    - name: Test
-      run: cd build ; ctest -j 10 -C Release --output-on-failure
-
-  msvc2022:
-    runs-on: windows-2022
-    strategy:
-      matrix:
-        build_type: [Debug, Release]
-        architecture: [Win32, x64]
-
-    steps:
-    - uses: actions/checkout@v3
-    - name: Run CMake
-      run: cmake -S . -B build -G "Visual Studio 17 2022" -A ${{ matrix.architecture }} -DJSON_BuildTests=On -DCMAKE_CXX_FLAGS="/W4 /WX"
-      if: matrix.build_type == 'Release'
-    - name: Run CMake
-      run: cmake -S . -B build -G "Visual Studio 17 2022" -A ${{ matrix.architecture }} -DJSON_BuildTests=On -DJSON_FastTests=ON -DCMAKE_CXX_FLAGS="/W4 /WX"
-      if: matrix.build_type == 'Debug'
-    - name: Build
-      run: cmake --build build --config ${{ matrix.build_type }} --parallel 10
-    - name: Test
-      run: cd build ; ctest -j 10 -C ${{ matrix.build_type }} --output-on-failure
-
-  msvc2022_latest:
     runs-on: windows-2022
 
     steps:
-    - uses: actions/checkout@v3
-    - name: Run CMake
-      run: cmake -S . -B build -G "Visual Studio 17 2022" -DJSON_BuildTests=On -DCMAKE_CXX_FLAGS="/permissive- /std:c++latest /utf-8 /W4 /WX"
-    - name: Build
-      run: cmake --build build --config Release --parallel 10
-    - name: Test
-      run: cd build ; ctest -j 10 -C Release --output-on-failure
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Set extra CXX_FLAGS for latest std_version
+        id: cxxflags
+        run: |
+          if [ "${{ matrix.std_version }}" = "latest" ]; then
+            echo "flags=/permissive- /std:c++latest /utf-8 /W4 /WX" >> $GITHUB_ENV
+          else
+            echo "flags=/W4 /WX" >> $GITHUB_ENV
+          fi
+        shell: bash
+      - name: Run CMake (Release)
+        run: cmake -S . -B build -G "Visual Studio 17 2022" -A ${{ matrix.architecture }} -DJSON_BuildTests=On -DCMAKE_CXX_FLAGS="$env:flags"
+        if: matrix.build_type == 'Release'
+        shell: pwsh
+      - name: Run CMake (Debug)
+        run: cmake -S . -B build -G "Visual Studio 17 2022" -A ${{ matrix.architecture }} -DJSON_BuildTests=On -DJSON_FastTests=ON -DCMAKE_CXX_FLAGS="$env:flags"
+        if: matrix.build_type == 'Debug'
+        shell: pwsh
+      - name: Build
+        run: cmake --build build --config ${{ matrix.build_type }} --parallel 10
+      - name: Test
+        run: cd build ; ctest -j 10 -C ${{ matrix.build_type }} --output-on-failure
 
   clang:
-    runs-on: windows-2019
+    runs-on: windows-2022
     strategy:
       matrix:
-        version: [11, 12]
+        version: [11.0.1, 12.0.1, 13.0.1, 14.0.6, 15.0.7, 16.0.6, 18.1.8, 19.1.7, 20.1.8]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Install Clang
-        run: curl -fsSL -o LLVM${{ matrix.version }}.exe https://github.com/llvm/llvm-project/releases/download/llvmorg-${{ matrix.version }}.0.0/LLVM-${{ matrix.version }}.0.0-win64.exe ; 7z x LLVM${{ matrix.version }}.exe -y -o"C:/Program Files/LLVM"
+        run: curl -fsSL -o LLVM${{ matrix.version }}.exe https://github.com/llvm/llvm-project/releases/download/llvmorg-${{ matrix.version }}/LLVM-${{ matrix.version }}-win64.exe ; 7z x LLVM${{ matrix.version }}.exe -y -o"C:/Program Files/LLVM"
+      - name: Set up MinGW
+        uses: egor-tensin/setup-mingw@41b837e47d7f85214629d255b9c4bc3fcbe9fd63 # v3.0
+        with:
+          platform: x64
+          version: 12.2.0 # https://github.com/egor-tensin/setup-mingw/issues/14
       - name: Run CMake
-        run: cmake -S . -B build -DCMAKE_CXX_COMPILER="C:/Program Files/LLVM/bin/clang++.exe" -G"MinGW Makefiles" -DCMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On
+        run: cmake -S . -B build ^
+             -DCMAKE_CXX_COMPILER="C:/Program Files/LLVM/bin/clang++.exe" ^
+             -DCMAKE_CXX_FLAGS="--target=x86_64-w64-mingw32 -stdlib=libstdc++ -pthread" ^
+             -DCMAKE_EXE_LINKER_FLAGS="-lwinpthread" ^
+             -G"MinGW Makefiles" ^
+             -DCMAKE_BUILD_TYPE=Debug ^
+             -DJSON_BuildTests=On
       - name: Build
         run: cmake --build build --parallel 10
       - name: Test
         run: cd build ; ctest -j 10 -C Debug --exclude-regex "test-unicode" --output-on-failure
 
-  clang-cl-11:
-    runs-on: windows-2019
+  clang-cl-12:
+    runs-on: windows-2022
     strategy:
       matrix:
         architecture: [Win32, x64]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Run CMake
-        run: cmake -S . -B build -G "Visual Studio 16 2019" -A ${{ matrix.architecture }} -T ClangCL -DJSON_BuildTests=On
+        run: cmake -S . -B build -G "Visual Studio 17 2022" -A ${{ matrix.architecture }} -T ClangCL -DJSON_BuildTests=On
       - name: Build
         run: cmake --build build --config Debug --parallel 10
       - name: Test
         run: cd build ; ctest -j 10 -C Debug --exclude-regex "test-unicode" --output-on-failure
+
+  ci_module_cpp20:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Run CMake (Debug)
+        run: cmake -S . -B build -G "Visual Studio 17 2022" -DJSON_CI=ON -DCMAKE_CXX_FLAGS="/permissive- /std:c++latest /utf-8 /W4 /WX"
+      - name: Build
+        run: cmake --build build --config Debug --target ci_module_cpp20
+        

.gitignore

@@ -4,9 +4,6 @@
 *.gcda
 .DS_Store
 
-.wsjcpp-logs/*
-.wsjcpp/*
-
 /.idea
 /cmake-build-*
 
@@ -26,12 +23,11 @@
 /tests/parse_*_fuzzer
 
 # documentation
-/docs/docset/docSet.dsidx
 /docs/docset/JSON_for_Modern_C++.docset/
 /docs/docset/JSON_for_Modern_C++.tgz
+/docs/docset/docSet.dsidx
+/docs/mkdocs/.cache/
 /docs/mkdocs/docs/__pycache__/
-/docs/mkdocs/docs/examples/
-/docs/mkdocs/docs/images/json.gif
 /docs/mkdocs/site/
 /docs/mkdocs/venv/
 
@@ -39,3 +35,13 @@
 /localhost.pem
 /localhost-key.pem
 /serve_header.yml
+
+# Swift Package Manager build directory
+/.build
+
+venv
+
+nlohmann_json.spdx
+
+# Bazel-related
+MODULE.bazel.lock

.lgtm.yml

@@ -1,4 +0,0 @@
-path_classifiers:
-  thirdparty:
-    - /tools/amalgamate
-    - /tools/cpplint

.reuse/README.md

@@ -1,7 +0,0 @@
-# REUSE Software
-
-This directory contains supporting files to make the project compliant with the REUSE specification.
-
-The root `Makefile` contains a target `reuse` that updates copyright headers and checks for compliance.
-
-See <http://reuse.software> for more information.

.reuse/dep5

@@ -4,11 +4,15 @@ Upstream-Contact: Niels Lohmann <mail@nlohmann.me>
 Source: https://github.com/nlohmann/json
 
 Files: *
-Copyright: 2013-2022 Niels Lohmann <https://nlohmann.me>
+Copyright: 2013-2026 Niels Lohmann <https://nlohmann.me>
 License: MIT
 
+Files: include/nlohmann/thirdparty/hedley.hpp
+Copyright: 2016-2021 Evan Nemerson <evan@nemerson.com>
+License: CC0
+
 Files: tests/thirdparty/doctest/*
-Copyright: 2016-2021 Viktor Kirilov
+Copyright: 2016-2023 Viktor Kirilov
 License: MIT
 
 Files: tests/thirdparty/fifo_map/*
@@ -16,7 +20,7 @@ Copyright: 2015-2017 Niels Lohmann
 License: MIT
 
 Files: tests/thirdparty/Fuzzer/*
-Copyright: 2003-2022, LLVM Project.
+Copyright: 2003-2022 LLVM Project.
 License: Apache-2.0
 
 Files: tests/thirdparty/imapdl/*
@@ -27,10 +31,6 @@ Files: tools/amalgamate/*
 Copyright: 2012 Erik Edlund <erik.edlund@32767.se>
 License: BSD-3-Clause
 
-Files: tools/cpplint/*
-Copyright: 2009 Google Inc. All rights reserved.
-License: BSD-3-Clause
-
-Files: tools/gdb_pretty_printer
+Files: tools/gdb_pretty_printer/*
 Copyright: 2020 Hannes Domani <https://github.com/ssbssa>
 License: MIT

.reuse/templates/json.jinja2

@@ -1,6 +1,6 @@
     __ _____ _____ _____
  __|  |   __|     |   | |  JSON for Modern C++
-|  |  |__   |  |  | | | |  version 3.11.2
+|  |  |__   |  |  | | | |  version 3.12.0
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json
 
 {% for copyright_line in copyright_lines %}

.reuse/templates/json_support.jinja2

@@ -1,6 +1,6 @@
     __ _____ _____ _____
  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
-|  |  |__   |  |  | | | |  version 3.11.2
+|  |  |__   |  |  | | | |  version 3.12.0
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json
 
 {% for copyright_line in copyright_lines %}

BUILD.bazel

@@ -0,0 +1,80 @@
+load("@rules_cc//cc:cc_library.bzl", "cc_library")
+load("@rules_license//rules:license.bzl", "license")
+
+package(
+    default_applicable_licenses = [":license"],
+)
+
+exports_files([
+    "LICENSE.MIT",
+])
+
+license(
+    name = "license",
+    license_kinds = ["@rules_license//licenses/spdx:MIT"],
+    license_text = "LICENSE.MIT",
+)
+
+cc_library(
+    name = "json",
+    hdrs = [
+        "include/nlohmann/adl_serializer.hpp",
+        "include/nlohmann/byte_container_with_subtype.hpp",
+        "include/nlohmann/detail/abi_macros.hpp",
+        "include/nlohmann/detail/conversions/from_json.hpp",
+        "include/nlohmann/detail/conversions/to_chars.hpp",
+        "include/nlohmann/detail/conversions/to_json.hpp",
+        "include/nlohmann/detail/exceptions.hpp",
+        "include/nlohmann/detail/hash.hpp",
+        "include/nlohmann/detail/input/binary_reader.hpp",
+        "include/nlohmann/detail/input/input_adapters.hpp",
+        "include/nlohmann/detail/input/json_sax.hpp",
+        "include/nlohmann/detail/input/lexer.hpp",
+        "include/nlohmann/detail/input/parser.hpp",
+        "include/nlohmann/detail/input/position_t.hpp",
+        "include/nlohmann/detail/iterators/internal_iterator.hpp",
+        "include/nlohmann/detail/iterators/iter_impl.hpp",
+        "include/nlohmann/detail/iterators/iteration_proxy.hpp",
+        "include/nlohmann/detail/iterators/iterator_traits.hpp",
+        "include/nlohmann/detail/iterators/json_reverse_iterator.hpp",
+        "include/nlohmann/detail/iterators/primitive_iterator.hpp",
+        "include/nlohmann/detail/json_custom_base_class.hpp",
+        "include/nlohmann/detail/json_pointer.hpp",
+        "include/nlohmann/detail/json_ref.hpp",
+        "include/nlohmann/detail/macro_scope.hpp",
+        "include/nlohmann/detail/macro_unscope.hpp",
+        "include/nlohmann/detail/meta/call_std/begin.hpp",
+        "include/nlohmann/detail/meta/call_std/end.hpp",
+        "include/nlohmann/detail/meta/cpp_future.hpp",
+        "include/nlohmann/detail/meta/detected.hpp",
+        "include/nlohmann/detail/meta/identity_tag.hpp",
+        "include/nlohmann/detail/meta/is_sax.hpp",
+        "include/nlohmann/detail/meta/std_fs.hpp",
+        "include/nlohmann/detail/meta/type_traits.hpp",
+        "include/nlohmann/detail/meta/void_t.hpp",
+        "include/nlohmann/detail/output/binary_writer.hpp",
+        "include/nlohmann/detail/output/output_adapters.hpp",
+        "include/nlohmann/detail/output/serializer.hpp",
+        "include/nlohmann/detail/string_concat.hpp",
+        "include/nlohmann/detail/string_escape.hpp",
+        "include/nlohmann/detail/string_utils.hpp",
+        "include/nlohmann/detail/value_t.hpp",
+        "include/nlohmann/json.hpp",
+        "include/nlohmann/json_fwd.hpp",
+        "include/nlohmann/ordered_map.hpp",
+        "include/nlohmann/thirdparty/hedley/hedley.hpp",
+        "include/nlohmann/thirdparty/hedley/hedley_undef.hpp",
+    ],
+    includes = ["include"],
+    visibility = ["//visibility:public"],
+    alwayslink = True,
+)
+
+cc_library(
+    name = "singleheader-json",
+    hdrs = [
+        "single_include/nlohmann/json.hpp",
+    ],
+    includes = ["single_include"],
+    visibility = ["//visibility:public"],
+)

CITATION.cff

@@ -7,8 +7,8 @@ authors:
     email: mail@nlohmann.me
     website: https://nlohmann.me
 title: "JSON for Modern C++"
-version: 3.11.2
-date-released: 2022-08-12
+version: 3.12.0
+date-released: 2025-04-07
 license: MIT
 repository-code: "https://github.com/nlohmann"
 url: https://json.nlohmann.me

CMakeLists.txt

@@ -1,10 +1,10 @@
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.5...4.0)
 
 ##
 ## PROJECT
 ## name and version
 ##
-project(nlohmann_json VERSION 3.11.2 LANGUAGES CXX)
+project(nlohmann_json VERSION 3.12.0 LANGUAGES CXX)
 
 ##
 ## MAIN_PROJECT CHECK
@@ -22,6 +22,18 @@ endif()
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH})
 include(ExternalProject)
 
+# ---- C++ Modules Support (optional) ----
+option(NLOHMANN_JSON_BUILD_MODULES "Build C++ modules support" OFF)
+
+if(NLOHMANN_JSON_BUILD_MODULES)
+    if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.28)
+        message(STATUS "Building nlohmann.json C++ module")
+        add_subdirectory(src/modules)
+    else()
+        message(WARNING "Skipping nlohmann.json C++ module (requires CMake 3.28+, found ${CMAKE_VERSION})")
+    endif()
+endif()
+
 ##
 ## OPTIONS
 ##
@@ -40,10 +52,11 @@ endif()
 option(JSON_BuildTests                     "Build the unit tests when BUILD_TESTING is enabled." ${JSON_BuildTests_INIT})
 option(JSON_CI                             "Enable CI build targets." OFF)
 option(JSON_Diagnostics                    "Use extended diagnostic messages." OFF)
-option(JSON_GlobalUDLs                     "Place use-defined string literals in the global namespace." ON)
+option(JSON_Diagnostic_Positions           "Enable diagnostic positions." OFF)
+option(JSON_GlobalUDLs                     "Place user-defined string literals in the global namespace." ON)
 option(JSON_ImplicitConversions            "Enable implicit conversions." ON)
 option(JSON_DisableEnumSerialization       "Disable default integer enum serialization." OFF)
-option(JSON_LegacyDiscardedValueComparison "Enable legacy discarded value comparison." OFF)           
+option(JSON_LegacyDiscardedValueComparison "Enable legacy discarded value comparison." OFF)
 option(JSON_Install                        "Install CMake targets during install step." ${MAIN_PROJECT})
 option(JSON_MultipleHeaders                "Use non-amalgamated version of the library." ON)
 option(JSON_SystemInclude                  "Include as system headers (skip for clang-tidy)." OFF)
@@ -57,7 +70,11 @@ endif ()
 ##
 include(GNUInstallDirs)
 
-set(NLOHMANN_JSON_TARGET_NAME               ${PROJECT_NAME})
+if (NOT DEFINED NLOHMANN_JSON_TARGET_NAME)
+    # Allow overriding the target name when using FetchContent / add_subdirectory.
+    set(NLOHMANN_JSON_TARGET_NAME ${PROJECT_NAME})
+endif()
+
 set(NLOHMANN_JSON_CONFIG_INSTALL_DIR        "${CMAKE_INSTALL_DATADIR}/cmake/${PROJECT_NAME}" CACHE INTERNAL "")
 set(NLOHMANN_JSON_INCLUDE_INSTALL_DIR       "${CMAKE_INSTALL_INCLUDEDIR}")
 set(NLOHMANN_JSON_TARGETS_EXPORT_NAME       "${PROJECT_NAME}Targets")
@@ -77,19 +94,27 @@ else()
 endif()
 
 if (NOT JSON_ImplicitConversions)
-    message(STATUS "Implicit conversions are disabled")
+    message(STATUS "Implicit conversions are disabled (JSON_USE_IMPLICIT_CONVERSIONS=0)")
 endif()
 
 if (JSON_DisableEnumSerialization)
-    message(STATUS "Enum integer serialization is disabled")
+    message(STATUS "Enum integer serialization is disabled (JSON_DISABLE_ENUM_SERIALIZATION=0)")
 endif()
 
 if (JSON_LegacyDiscardedValueComparison)
-    message(STATUS "Legacy discarded value comparison enabled")
+    message(STATUS "Legacy discarded value comparison enabled (JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON=1)")
 endif()
 
 if (JSON_Diagnostics)
-    message(STATUS "Diagnostics enabled")
+    message(STATUS "Diagnostics enabled (JSON_DIAGNOSTICS=1)")
+endif()
+
+if (JSON_Diagnostic_Positions)
+    message(STATUS "Diagnostic positions enabled (JSON_DIAGNOSTIC_POSITIONS=1)")
+endif()
+
+if (NOT JSON_GlobalUDLs)
+    message(STATUS "User-defined string literals are not put in the global namespace (JSON_USE_GLOBAL_UDLS=0)")
 endif()
 
 if (JSON_SystemInclude)
@@ -115,6 +140,7 @@ target_compile_definitions(
     $<$<NOT:$<BOOL:${JSON_ImplicitConversions}>>:JSON_USE_IMPLICIT_CONVERSIONS=0>
     $<$<BOOL:${JSON_DisableEnumSerialization}>:JSON_DISABLE_ENUM_SERIALIZATION=1>
     $<$<BOOL:${JSON_Diagnostics}>:JSON_DIAGNOSTICS=1>
+    $<$<BOOL:${JSON_Diagnostic_Positions}>:JSON_DIAGNOSTIC_POSITIONS=1>
     $<$<BOOL:${JSON_LegacyDiscardedValueComparison}>:JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON=1>
 )
 
@@ -122,7 +148,7 @@ target_include_directories(
     ${NLOHMANN_JSON_TARGET_NAME}
     ${NLOHMANN_JSON_SYSTEM_INCLUDE} INTERFACE
     $<BUILD_INTERFACE:${NLOHMANN_JSON_INCLUDE_BUILD_DIR}>
-    $<INSTALL_INTERFACE:include>
+    $<INSTALL_INTERFACE:${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}>
 )
 
 ## add debug view definition file for msvc (natvis)
@@ -141,6 +167,7 @@ endif()
 CONFIGURE_FILE(
     "${CMAKE_CURRENT_SOURCE_DIR}/cmake/pkg-config.pc.in"
     "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.pc"
+    @ONLY
 )
 
 ##
@@ -206,4 +233,5 @@ if(JSON_Install)
         FILES "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.pc"
         DESTINATION ${NLOHMANN_JSON_PKGCONFIG_INSTALL_DIR}
     )
+    include(CPack)
 endif()

ChangeLog.md

@@ -1,9 +1,340 @@
 # Changelog
 All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org/).
 
-## [3.11.2](https://github.com/nlohmann/json/releases/tag/3.11.2) (2022-08-12)
+## [unreleased](https://github.com/nlohmann/json/releases/tag/unreleased) (2024-12-22)
 
-[Full Changelog](https://github.com/nlohmann/json/compare/v3.11.1...3.11.2)
+[Full Changelog](https://github.com/nlohmann/json/compare/v3.11.3...unreleased)
+
+- Impossible de read json file create with nlohmann::ordered\_json::dump [\#4556](https://github.com/nlohmann/json/issues/4556)
+- Error C2039 : 'json\_sax\_dom\_callback\_parser': is not a member of 'nlohmann::json\_abi\_v3\_11\_3::detail' [\#4529](https://github.com/nlohmann/json/issues/4529)
+- `json_fwd.hpp`  don't define default template arguments for ordered\_map [\#4518](https://github.com/nlohmann/json/issues/4518)
+- new repo version seems stop create any the ingress-nginx controller with opentelemetry-cpp.git [\#4515](https://github.com/nlohmann/json/issues/4515)
+- Error converting to/from scoped enumerations [\#4499](https://github.com/nlohmann/json/issues/4499)
+- Default initialized iterators are not comparable [\#4493](https://github.com/nlohmann/json/issues/4493)
+- Bug json.exception.type\_error.302 [\#4492](https://github.com/nlohmann/json/issues/4492)
+- tests fail to build with clang-19 and libc++ due to unsupported `std::char_traits` [\#4490](https://github.com/nlohmann/json/issues/4490)
+- Brace-Initialization Fails with json::parse and Key Access on Linux [\#4488](https://github.com/nlohmann/json/issues/4488)
+- Crash when parsing nullptr [\#4485](https://github.com/nlohmann/json/issues/4485)
+- Namespace macros are not respected in many instances [\#4484](https://github.com/nlohmann/json/issues/4484)
+- ohos model to json string garbage characters [\#4481](https://github.com/nlohmann/json/issues/4481)
+- Missing newlines in deserialized string [\#4479](https://github.com/nlohmann/json/issues/4479)
+- Latest tag not available on NuGet [\#4478](https://github.com/nlohmann/json/issues/4478)
+- Invalid union access for get\_ref/get\_ptr with unsigned integer [\#4475](https://github.com/nlohmann/json/issues/4475)
+- /accesswallet [\#4469](https://github.com/nlohmann/json/issues/4469)
+- struct reflect json with error C2440 [\#4467](https://github.com/nlohmann/json/issues/4467)
+- Compiler error when using macro NLOHMANN\_DEFINE\_TYPE\_NON\_INTRUSIVE [\#4463](https://github.com/nlohmann/json/issues/4463)
+- Issue when dumping a vector of derived classes [\#4462](https://github.com/nlohmann/json/issues/4462)
+- whit std::wstring compile error [\#4460](https://github.com/nlohmann/json/issues/4460)
+- Inconsisten operator\[\] [\#4458](https://github.com/nlohmann/json/issues/4458)
+- json parse enclosing json object with \[\] [\#4457](https://github.com/nlohmann/json/issues/4457)
+- \[bug\] nlohmann::json constructor behaves improperly [\#4450](https://github.com/nlohmann/json/issues/4450)
+- parse OOM [\#4449](https://github.com/nlohmann/json/issues/4449)
+- Library Cannot Parse JSON File It Wrote [\#4448](https://github.com/nlohmann/json/issues/4448)
+- Unexpected Integer Conversion of JSON Values on ARM64 [\#4447](https://github.com/nlohmann/json/issues/4447)
+- Structure declared in natvis file template doesn't seem to match current structure of `basic_json<>` [\#4438](https://github.com/nlohmann/json/issues/4438)
+- A lot of EOT in json file [\#4436](https://github.com/nlohmann/json/issues/4436)
+- CVE-2024-34062 [\#4429](https://github.com/nlohmann/json/issues/4429)
+- CVE-2024-39689 [\#4428](https://github.com/nlohmann/json/issues/4428)
+- CVE-2024-5569 [\#4427](https://github.com/nlohmann/json/issues/4427)
+- CVE-2024-37891 [\#4426](https://github.com/nlohmann/json/issues/4426)
+- Tornado vulnerabilities [\#4425](https://github.com/nlohmann/json/issues/4425)
+- CVE-2024-35195 [\#4424](https://github.com/nlohmann/json/issues/4424)
+-  CVE-2024-22195, CVE-2024-34064 [\#4423](https://github.com/nlohmann/json/issues/4423)
+- CVE-2024-3651 [\#4422](https://github.com/nlohmann/json/issues/4422)
+- CVE-2024-22190 [\#4421](https://github.com/nlohmann/json/issues/4421)
+- CVE-2024-39705 [\#4420](https://github.com/nlohmann/json/issues/4420)
+- Failing to read complex Unicode string embedded in JSON [\#4417](https://github.com/nlohmann/json/issues/4417)
+- Unable to parse JSON string from snake case to camel case [\#4399](https://github.com/nlohmann/json/issues/4399)
+- Crashes when I try to use ‘json::at\(\)’ on a properly structured, non null, and correctly constructed ‘.json’ file [\#4387](https://github.com/nlohmann/json/issues/4387)
+- JSON\_BuildTests fail when JSON\_DisableEnumSerialization is set to ON [\#4384](https://github.com/nlohmann/json/issues/4384)
+- JSON can't parse a simple data [\#4383](https://github.com/nlohmann/json/issues/4383)
+- json.exception.type\_error.302 [\#4373](https://github.com/nlohmann/json/issues/4373)
+- iteration\_proxy has limited usefulness in C++20 range views [\#4371](https://github.com/nlohmann/json/issues/4371)
+- Clone is long due to large history [\#4370](https://github.com/nlohmann/json/issues/4370)
+- Can't use nlohmann on Linux [\#4363](https://github.com/nlohmann/json/issues/4363)
+- CodeQL suppressions lack justification [\#4361](https://github.com/nlohmann/json/issues/4361)
+- \[json.exception.parse\_error.101\] parse error at line 1, column 4520: syntax error while parsing value - invalid string: forbidden character after backslash; last read: '".\? [\#4352](https://github.com/nlohmann/json/issues/4352)
+- Cannot unflatten json object [\#4349](https://github.com/nlohmann/json/issues/4349)
+- Json parsed from raw string does not interpret lists of objects like json parsed from file [\#4341](https://github.com/nlohmann/json/issues/4341)
+- natvis not updated to 3.11.3 [\#4340](https://github.com/nlohmann/json/issues/4340)
+- Wrong function name in documentation example [\#4334](https://github.com/nlohmann/json/issues/4334)
+- git ref got interpreted as number  [\#4332](https://github.com/nlohmann/json/issues/4332)
+- Is float valid number been limited? [\#4322](https://github.com/nlohmann/json/issues/4322)
+- Crash when construct a new json object [\#4321](https://github.com/nlohmann/json/issues/4321)
+- gdb-pretty-print broken since m\_data added [\#4309](https://github.com/nlohmann/json/issues/4309)
+- Docs have incorrect info for `update()` [\#4307](https://github.com/nlohmann/json/issues/4307)
+- CBOR data cannot be decoded [\#4301](https://github.com/nlohmann/json/issues/4301)
+- Inconsistent behaviour of json construction using `std::initializer_list` [\#4299](https://github.com/nlohmann/json/issues/4299)
+- Assertion failed when accessing non-existing object with const json object [\#4297](https://github.com/nlohmann/json/issues/4297)
+- Validatable release artifacts are not sufficient for packaging \(trying to run tests\) [\#4296](https://github.com/nlohmann/json/issues/4296)
+- ordered json pointer corruption [\#4289](https://github.com/nlohmann/json/issues/4289)
+- Incorrect floating point parsing [\#4285](https://github.com/nlohmann/json/issues/4285)
+- Segfault on parse when using "\#pragma pack \(push, 1\)" [\#4284](https://github.com/nlohmann/json/issues/4284)
+- Simple example with nlohmann::ordered\_json doesn't compile [\#4282](https://github.com/nlohmann/json/issues/4282)
+- Program crashes with ordered\_json, but works fine with json [\#4279](https://github.com/nlohmann/json/issues/4279)
+- JSON parses as array when assigned in initializer list. [\#4278](https://github.com/nlohmann/json/issues/4278)
+- Can't run `make amalgamate` [\#4275](https://github.com/nlohmann/json/issues/4275)
+- Parsing the unicode string got the wrong result [\#4272](https://github.com/nlohmann/json/issues/4272)
+- Issue with including \<version\> [\#4241](https://github.com/nlohmann/json/issues/4241)
+- Exception when trying to insert my json object inside json file [\#4239](https://github.com/nlohmann/json/issues/4239)
+- `to_json` is erroneously converting enums with underlying unsigned types to signed numbers [\#4236](https://github.com/nlohmann/json/issues/4236)
+- Build failure on macOS Sonoma 14.1.1 [\#4228](https://github.com/nlohmann/json/issues/4228)
+- Deprecation warning on save action in check-amalgamation CI step [\#4227](https://github.com/nlohmann/json/issues/4227)
+- 3.11.3: test suite fails in 4 units [\#4224](https://github.com/nlohmann/json/issues/4224)
+- Exception thrown when dumping utf-8 characters when using std::string [\#4213](https://github.com/nlohmann/json/issues/4213)
+- patch\_inplace assumes StringType is std::string [\#4134](https://github.com/nlohmann/json/issues/4134)
+- Getting a weak-vtables warning with clang on ubuntu 22.04 [\#4087](https://github.com/nlohmann/json/issues/4087)
+- SAX interface unexpectedly gets locale-altered float representation. [\#4084](https://github.com/nlohmann/json/issues/4084)
+- Feat: hash pin github workflow dependencies [\#4058](https://github.com/nlohmann/json/issues/4058)
+- compiler error using clang-16.0.5 when using gcc-13.1 standard library [\#4051](https://github.com/nlohmann/json/issues/4051)
+- Missing requirement on `plantuml` binary package [\#4026](https://github.com/nlohmann/json/issues/4026)
+- Compile failure for macos 10.10 SDK + darwin14 [\#3991](https://github.com/nlohmann/json/issues/3991)
+- Test suite does not compile with C++20 and Clang 17 [\#3979](https://github.com/nlohmann/json/issues/3979)
+- `modernize-avoid-c-arrays` clang-tidy warning when using `NLOHMANN_JSON_SERIALIZE_ENUM` macro [\#3924](https://github.com/nlohmann/json/issues/3924)
+- JSON\_DIAGNOSTICS trigger assertion [\#3915](https://github.com/nlohmann/json/issues/3915)
+- Compiler warning 'array-bounds' on g++12.2.0 on Ubuntu 22.10 kinetic with RelWithDebugInfo [\#3808](https://github.com/nlohmann/json/issues/3808)
+- The MSVC team recently test JSON project failed to run test on release configuration on windows\_x64. [\#3542](https://github.com/nlohmann/json/issues/3542)
+- Bad JSON diff when removing object in array of object [\#3146](https://github.com/nlohmann/json/issues/3146)
+- Limit AppVeyor use [\#3089](https://github.com/nlohmann/json/issues/3089)
+- pkgconfig integration wrongly rendered if tests are run [\#2907](https://github.com/nlohmann/json/issues/2907)
+- Compile error for json in template and  variadic macros. [\#2794](https://github.com/nlohmann/json/issues/2794)
+- How to Serialize derived class to JSON object?  [\#2199](https://github.com/nlohmann/json/issues/2199)
+- \[C++17\] Allow std::optional to convert to nlohmann::json [\#1749](https://github.com/nlohmann/json/issues/1749)
+
+- Fix typo in nlohmann\_define\_derived\_type.md [\#4565](https://github.com/nlohmann/json/pull/4565) ([gregmarr](https://github.com/gregmarr))
+- Add ONLY\_SERIALIZE for NLOHMANN\_DEFINE\_DERIVED\_TYPE\_\* macros [\#4562](https://github.com/nlohmann/json/pull/4562) ([EinarsNG](https://github.com/EinarsNG))
+- Suppress modernize-use-integer-sign-comparison [\#4558](https://github.com/nlohmann/json/pull/4558) ([nlohmann](https://github.com/nlohmann))
+- Bump actions/upload-artifact from 4.4.3 to 4.5.0 [\#4557](https://github.com/nlohmann/json/pull/4557) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Clean up CI [\#4553](https://github.com/nlohmann/json/pull/4553) ([nlohmann](https://github.com/nlohmann))
+- \[StepSecurity\] ci: Harden GitHub Actions [\#4551](https://github.com/nlohmann/json/pull/4551) ([step-security-bot](https://github.com/step-security-bot))
+- Fix token permissions warnings [\#4550](https://github.com/nlohmann/json/pull/4550) ([nlohmann](https://github.com/nlohmann))
+- Add step to build the documentation [\#4549](https://github.com/nlohmann/json/pull/4549) ([nlohmann](https://github.com/nlohmann))
+- Bump mkdocs-material from 9.5.48 to 9.5.49 in /docs/mkdocs [\#4548](https://github.com/nlohmann/json/pull/4548) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Move reuse dependency to requirements.txt file [\#4547](https://github.com/nlohmann/json/pull/4547) ([nlohmann](https://github.com/nlohmann))
+- Clean up  [\#4546](https://github.com/nlohmann/json/pull/4546) ([nlohmann](https://github.com/nlohmann))
+- ⬆️ Bump ossf/scorecard-action from 2.3.3 to 2.4.0 [\#4545](https://github.com/nlohmann/json/pull/4545) ([dependabot[bot]](https://github.com/apps/dependabot))
+- ⬆️ Bump lukka/get-cmake from 3.31.0 to 3.31.2 [\#4544](https://github.com/nlohmann/json/pull/4544) ([dependabot[bot]](https://github.com/apps/dependabot))
+- ⬆️ Bump github/codeql-action from 2.27.9 to 3.27.9 [\#4543](https://github.com/nlohmann/json/pull/4543) ([dependabot[bot]](https://github.com/apps/dependabot))
+- ⬆️ Bump watchdog from 2.1.7 to 6.0.0 in /tools/serve\_header [\#4542](https://github.com/nlohmann/json/pull/4542) ([dependabot[bot]](https://github.com/apps/dependabot))
+- ⬆️ Bump pyyaml from 6.0 to 6.0.2 in /tools/serve\_header [\#4541](https://github.com/nlohmann/json/pull/4541) ([dependabot[bot]](https://github.com/apps/dependabot))
+- ⬆️ Bump actions/github-script from 6.4.0 to 7.0.1 [\#4540](https://github.com/nlohmann/json/pull/4540) ([dependabot[bot]](https://github.com/apps/dependabot))
+- \[StepSecurity\] Apply security best practices [\#4539](https://github.com/nlohmann/json/pull/4539) ([step-security-bot](https://github.com/step-security-bot))
+- Set parents after insert call [\#4537](https://github.com/nlohmann/json/pull/4537) ([nlohmann](https://github.com/nlohmann))
+- Allow patch and diff to be used with arbitrary string types [\#4536](https://github.com/nlohmann/json/pull/4536) ([nlohmann](https://github.com/nlohmann))
+- Add more package managers [\#4533](https://github.com/nlohmann/json/pull/4533) ([nlohmann](https://github.com/nlohmann))
+- Replace EOF with char\_traits [\#4532](https://github.com/nlohmann/json/pull/4532) ([nlohmann](https://github.com/nlohmann))
+- Fix return value of get\_ptr for unsigned integers [\#4525](https://github.com/nlohmann/json/pull/4525) ([nlohmann](https://github.com/nlohmann))
+- Add more GCC warning flags [\#4524](https://github.com/nlohmann/json/pull/4524) ([nlohmann](https://github.com/nlohmann))
+- Update licenses [\#4521](https://github.com/nlohmann/json/pull/4521) ([nlohmann](https://github.com/nlohmann))
+- json start/end position implementation [\#4517](https://github.com/nlohmann/json/pull/4517) ([sushshring](https://github.com/sushshring))
+- Overwork documentation [\#4516](https://github.com/nlohmann/json/pull/4516) ([nlohmann](https://github.com/nlohmann))
+- Allow comparing default initialized iterators [\#4512](https://github.com/nlohmann/json/pull/4512) ([nlohmann](https://github.com/nlohmann))
+- fix: integer parsed as float when EINTR set in errno [\#4506](https://github.com/nlohmann/json/pull/4506) ([StuartGorman](https://github.com/StuartGorman))
+- Make SAX output locale-independent [\#4505](https://github.com/nlohmann/json/pull/4505) ([nlohmann](https://github.com/nlohmann))
+- Skip enum tests when JSON\_DisableEnumSerialization=ON [\#4504](https://github.com/nlohmann/json/pull/4504) ([nlohmann](https://github.com/nlohmann))
+- Fix weak-vtables warning [\#4500](https://github.com/nlohmann/json/pull/4500) ([nlohmann](https://github.com/nlohmann))
+- Suppress warnings in NLOHMANN\_JSON\_SERIALIZE\_ENUM [\#4497](https://github.com/nlohmann/json/pull/4497) ([nlohmann](https://github.com/nlohmann))
+- Add comment for \#4494 [\#4496](https://github.com/nlohmann/json/pull/4496) ([nlohmann](https://github.com/nlohmann))
+- Add test for libstdc++ [\#4495](https://github.com/nlohmann/json/pull/4495) ([nlohmann](https://github.com/nlohmann))
+- Another desperate try to fix the CI [\#4489](https://github.com/nlohmann/json/pull/4489) ([nlohmann](https://github.com/nlohmann))
+- Possible fix for \#4485 [\#4487](https://github.com/nlohmann/json/pull/4487) ([jordan-hoang](https://github.com/jordan-hoang))
+- Update CONTRIBUTING.md [\#4486](https://github.com/nlohmann/json/pull/4486) ([zerocukor287](https://github.com/zerocukor287))
+- Allow overriding the CMake target name [\#4483](https://github.com/nlohmann/json/pull/4483) ([iboB](https://github.com/iboB))
+- Update is\_structured.md [\#4472](https://github.com/nlohmann/json/pull/4472) ([thetimr](https://github.com/thetimr))
+- Add CPack support [\#4459](https://github.com/nlohmann/json/pull/4459) ([zjyhjqs](https://github.com/zjyhjqs))
+- CMake: generate a pkg-config file that follow pkg-config conventions [\#4456](https://github.com/nlohmann/json/pull/4456) ([dcbaker](https://github.com/dcbaker))
+- Update natvis to reflect 3.11.3 and the current structure of basic\_json [\#4451](https://github.com/nlohmann/json/pull/4451) ([gmyers18](https://github.com/gmyers18))
+- Docs: fix typos of 'whether' in `operator_{gt,le,lt}.md` [\#4412](https://github.com/nlohmann/json/pull/4412) ([tsnl](https://github.com/tsnl))
+- Remove alwayslink=True Bazel flag [\#4396](https://github.com/nlohmann/json/pull/4396) ([mering](https://github.com/mering))
+- Optimize binary `get_number` implementation by reading multiple bytes at once [\#4391](https://github.com/nlohmann/json/pull/4391) ([TianyiChen](https://github.com/TianyiChen))
+- Make iterator\_proxy\_value a forward\_iterator \(\#4371\) [\#4372](https://github.com/nlohmann/json/pull/4372) ([captaincrutches](https://github.com/captaincrutches))
+- Add lgtm explanation [\#4362](https://github.com/nlohmann/json/pull/4362) ([nlohmann](https://github.com/nlohmann))
+- chore: fix some typos in comments [\#4345](https://github.com/nlohmann/json/pull/4345) ([laterlaugh](https://github.com/laterlaugh))
+- Fix gdb pretty printer [\#4343](https://github.com/nlohmann/json/pull/4343) ([MrJia1997](https://github.com/MrJia1997))
+- Fix for incorrect function name in documentation example [\#4342](https://github.com/nlohmann/json/pull/4342) ([alexprabhat99](https://github.com/alexprabhat99))
+- Fixed an error in the `Custom data source` example. [\#4335](https://github.com/nlohmann/json/pull/4335) ([philip-paul-mueller](https://github.com/philip-paul-mueller))
+- Updated exception handling to catch const reference in out\_of\_range [\#4331](https://github.com/nlohmann/json/pull/4331) ([LeilaShcheglova](https://github.com/LeilaShcheglova))
+- \#4307 Updated docx to 3.10.5 from 3.10.4 [\#4310](https://github.com/nlohmann/json/pull/4310) ([AniketDhemare](https://github.com/AniketDhemare))
+- Align astyle flags in Makefile with CI [\#4277](https://github.com/nlohmann/json/pull/4277) ([serge-s](https://github.com/serge-s))
+- Suppress Clang-Tidy warnings [\#4276](https://github.com/nlohmann/json/pull/4276) ([nlohmann](https://github.com/nlohmann))
+- Remove broken link from CONTRIBUTING.md [\#4274](https://github.com/nlohmann/json/pull/4274) ([serge-s](https://github.com/serge-s))
+- Fix version in json\_has\_static\_rtti.md [\#4269](https://github.com/nlohmann/json/pull/4269) ([ALF-ONE](https://github.com/ALF-ONE))
+- Add support of multi-dim C-style array member of struct. [\#4262](https://github.com/nlohmann/json/pull/4262) ([peng-wang-cn](https://github.com/peng-wang-cn))
+- Docs: Fix wrong code usage in the Value access section of `json_pointer.md` [\#4255](https://github.com/nlohmann/json/pull/4255) ([Fallen-Breath](https://github.com/Fallen-Breath))
+- Fix `to_json` for enums when the enum has an unsigned underlying type. [\#4237](https://github.com/nlohmann/json/pull/4237) ([TheJCAB](https://github.com/TheJCAB))
+- feat: Rebase `feature/optional` to `develop` [\#4036](https://github.com/nlohmann/json/pull/4036) ([fsandhei](https://github.com/fsandhei))
+- Add NLOHMANN\_DEFINE\_DERIVED\_TYPE\_\* macros [\#4033](https://github.com/nlohmann/json/pull/4033) ([rotolof](https://github.com/rotolof))
+
+## [v3.11.3](https://github.com/nlohmann/json/releases/tag/v3.11.3) (2023-11-28)
+
+[Full Changelog](https://github.com/nlohmann/json/compare/v3.11.2...v3.11.3)
+
+- Parser and constructor resolve integer types differently [\#4207](https://github.com/nlohmann/json/issues/4207)
+- README.md overuses `template` keyword before `get` function [\#4205](https://github.com/nlohmann/json/issues/4205)
+- Exception SIGSEGV - Segmentation violation signal on file parsing \(v3.11.2, linux, doctest\) [\#4193](https://github.com/nlohmann/json/issues/4193)
+- In highly nested functions, passing json into a function leads to a segmentation fault/bus error [\#4186](https://github.com/nlohmann/json/issues/4186)
+- why a single-object json file appears in an array [\#4183](https://github.com/nlohmann/json/issues/4183)
+- Initializing `json` by direct initialization and copy initialization invokes different constructors [\#4174](https://github.com/nlohmann/json/issues/4174)
+- Deprecation warning about std::char\_traits\<unsigned char\> [\#4163](https://github.com/nlohmann/json/issues/4163)
+- LLVM 16.0.6 issues warning for literal operators when Wdeprecated-literal-operator [\#4129](https://github.com/nlohmann/json/issues/4129)
+- GCC compiler warning about violating the C++ One Definition Rule \[-Wodr\] [\#4116](https://github.com/nlohmann/json/issues/4116)
+- error: building nlohmann-json:arm64-osx failed with: BUILD\_FAILED [\#4091](https://github.com/nlohmann/json/issues/4091)
+- dump\(\): Non-conforming with JSON-spec escape of strings? [\#4088](https://github.com/nlohmann/json/issues/4088)
+- Compiling in visual studio 2022 gives a warning [\#4081](https://github.com/nlohmann/json/issues/4081)
+- Upgrade CMake minimum version [\#4076](https://github.com/nlohmann/json/issues/4076)
+- \ character in the content of a string cause error in parser.? [\#4067](https://github.com/nlohmann/json/issues/4067)
+- JSON Parsing Freeze Issue on Nintendo Switch [\#4066](https://github.com/nlohmann/json/issues/4066)
+- Clang++ compilation fails on extremely small example [\#4061](https://github.com/nlohmann/json/issues/4061)
+- how about open a new repository for header only version？ [\#4060](https://github.com/nlohmann/json/issues/4060)
+- json::count returns only 0 or 1 [\#4052](https://github.com/nlohmann/json/issues/4052)
+- std::function error  [\#4050](https://github.com/nlohmann/json/issues/4050)
+- Json package not compiling properly  [\#4042](https://github.com/nlohmann/json/issues/4042)
+- Explicit conversion example in docs should use `template get` [\#4038](https://github.com/nlohmann/json/issues/4038)
+- Improve wording of parse\_error exception [\#4037](https://github.com/nlohmann/json/issues/4037)
+- Parse error on valid JSON file  [\#4028](https://github.com/nlohmann/json/issues/4028)
+- Empty JSON object returns size of 1 [\#4027](https://github.com/nlohmann/json/issues/4027)
+- Help needed to fix CI [\#4025](https://github.com/nlohmann/json/issues/4025)
+- Security vulnerabilities detected: CVE-2022-24439, WS-2022-0438, WS-2022-0437 [\#4020](https://github.com/nlohmann/json/issues/4020)
+- multithreading use from\_msgpack  leading very slow [\#4016](https://github.com/nlohmann/json/issues/4016)
+- Error with sol for Lua: items\(\) is not a recognized container [\#4012](https://github.com/nlohmann/json/issues/4012)
+- Parser does not read non ascii characters : ŞÜİĞ [\#4007](https://github.com/nlohmann/json/issues/4007)
+- malloc\(\): unaligned fastbin chunk detected [\#3999](https://github.com/nlohmann/json/issues/3999)
+- try/catch block doesn't work while accessing const json& array. [\#3998](https://github.com/nlohmann/json/issues/3998)
+- a bug about list [\#3995](https://github.com/nlohmann/json/issues/3995)
+- heap corruption when i use nlohmann::json::accept function to check a valid json [\#3994](https://github.com/nlohmann/json/issues/3994)
+- Exception on gcc but not apple clang [\#3986](https://github.com/nlohmann/json/issues/3986)
+- Can't support convert the type?      std::string json\_str = R"\({"value": "3.1415"}\)"; float value = j\["value"\].get\<float\>\(\);   [\#3984](https://github.com/nlohmann/json/issues/3984)
+- `#pragma once` not supported with C++20 modules in clang [\#3974](https://github.com/nlohmann/json/issues/3974)
+- const array\_t::operator\[\] results in buffer overflow / segv on nullptr on out of bounds access [\#3973](https://github.com/nlohmann/json/issues/3973)
+- Set minimal permissions to Github Workflows [\#3971](https://github.com/nlohmann/json/issues/3971)
+- Parsing array error [\#3968](https://github.com/nlohmann/json/issues/3968)
+- why I can return tuple as json? [\#3961](https://github.com/nlohmann/json/issues/3961)
+- type must be number, but is null [\#3956](https://github.com/nlohmann/json/issues/3956)
+- Class Composition of json members produces incorrect json when constructing with initialization list [\#3955](https://github.com/nlohmann/json/issues/3955)
+- exit without error message [\#3948](https://github.com/nlohmann/json/issues/3948)
+- NLOHMANN\_DEFINE\_TYPE\_INTRUSIVE doesn't work with "json\_fwd.hpp" [\#3946](https://github.com/nlohmann/json/issues/3946)
+- Dangerous use of pull\_request\_target [\#3945](https://github.com/nlohmann/json/issues/3945)
+- Test  \#7: test-bjdata\_cpp11 ............................\*\*\*Failed [\#3941](https://github.com/nlohmann/json/issues/3941)
+- Memory leak detection with basic usage of NLOHMANN\_JSON\_SERIALIZE\_ENUM [\#3939](https://github.com/nlohmann/json/issues/3939)
+- Parse doesnt work [\#3936](https://github.com/nlohmann/json/issues/3936)
+- Clean up badges [\#3935](https://github.com/nlohmann/json/issues/3935)
+- \[json.exception.type\_error.305\] cannot use operator\[\] with a string argument with array [\#3931](https://github.com/nlohmann/json/issues/3931)
+- GCC 13 build failures [\#3927](https://github.com/nlohmann/json/issues/3927)
+- Exception throw even though code is inside try/catch [\#3926](https://github.com/nlohmann/json/issues/3926)
+- Please fix failing tests [\#3923](https://github.com/nlohmann/json/issues/3923)
+- Security vulnerability in dependency: future 0.18.2 [\#3922](https://github.com/nlohmann/json/issues/3922)
+- json pretty printer causes python exceptions on non-json types [\#3919](https://github.com/nlohmann/json/issues/3919)
+- how does a normal basic\_json\<\> object cuase  assertion `false` [\#3918](https://github.com/nlohmann/json/issues/3918)
+- The library can not parse JSON generate by Chome DevTools Protocol [\#3903](https://github.com/nlohmann/json/issues/3903)
+- Typo in `cmake/test.cmake` [\#3902](https://github.com/nlohmann/json/issues/3902)
+- Parser adds wrapping array when compiled with GCC [\#3897](https://github.com/nlohmann/json/issues/3897)
+- when i use for\(auto iter& : jsonObject\) it occure some error    [\#3893](https://github.com/nlohmann/json/issues/3893)
+- Check Drone CI [\#3890](https://github.com/nlohmann/json/issues/3890)
+- Json::accept\(std::ifstream\) [\#3884](https://github.com/nlohmann/json/issues/3884)
+- \[json.exception.parse\_error.101\] parse error at line 1, column 1: syntax error while parsing value - unexpected end of input; expected '\[', '{', or a literal [\#3882](https://github.com/nlohmann/json/issues/3882)
+- Memory leak when exception is thrown in adl\_serializer::to\_json [\#3881](https://github.com/nlohmann/json/issues/3881)
+- building with cmake [\#3880](https://github.com/nlohmann/json/issues/3880)
+- \[json.exception.type\_error.316\] invalid UTF-8 byte at index 0: 0xB6 [\#3879](https://github.com/nlohmann/json/issues/3879)
+- Visual Studio 2015 C2664 error std::pair\< [\#3867](https://github.com/nlohmann/json/issues/3867)
+- I want the data field to be empty serialized and deserialized to each other [\#3866](https://github.com/nlohmann/json/issues/3866)
+- Generated natvis is invalid XML [\#3858](https://github.com/nlohmann/json/issues/3858)
+- Json Arrays have inconsistent nesting levels across different OSs [\#3854](https://github.com/nlohmann/json/issues/3854)
+- Occur error when parse character '\'  [\#3844](https://github.com/nlohmann/json/issues/3844)
+- Proccess crash as soon as I parse json [\#3843](https://github.com/nlohmann/json/issues/3843)
+- json::parse and constructor with the same json generates different type [\#3842](https://github.com/nlohmann/json/issues/3842)
+- json::accept return false on valid JSON [\#3838](https://github.com/nlohmann/json/issues/3838)
+- decode\(state, codep, byte\) generates warnings. [\#3837](https://github.com/nlohmann/json/issues/3837)
+- Arithmetic operators are not working as expected [\#3832](https://github.com/nlohmann/json/issues/3832)
+- array\_index does not catch std::invalid\_argument exception from std::stoull [\#3831](https://github.com/nlohmann/json/issues/3831)
+- 3.11.2: test suite is failing in two units [\#3828](https://github.com/nlohmann/json/issues/3828)
+- Compile Error on g++ using get\(\) function [\#3827](https://github.com/nlohmann/json/issues/3827)
+- nlohmann::json::parse can't handle the "€" symbol. [\#3825](https://github.com/nlohmann/json/issues/3825)
+- When reading a non-existent key, I unexpectedly get a value. Is it the wrong way I use it? [\#3811](https://github.com/nlohmann/json/issues/3811)
+- Code analysis warning string\_concat.hpp C26800: Use of a moved from object [\#3805](https://github.com/nlohmann/json/issues/3805)
+- The code used to build with 3.10.2 but fails now [\#3804](https://github.com/nlohmann/json/issues/3804)
+- Inconsistent Behaviour of NaN & Null Values  [\#3799](https://github.com/nlohmann/json/issues/3799)
+- json\_fwd.hpp doesn't work [\#3796](https://github.com/nlohmann/json/issues/3796)
+- Compilation fails in MSVC 22 [\#3787](https://github.com/nlohmann/json/issues/3787)
+- parsing json with missing key throws exception [\#3784](https://github.com/nlohmann/json/issues/3784)
+- Allow to disable inline namespaces completley [\#3746](https://github.com/nlohmann/json/issues/3746)
+- double free or Assertion failed! [\#3729](https://github.com/nlohmann/json/issues/3729)
+- Amalgated json\_fwd.hpp not included in include.zip [\#3727](https://github.com/nlohmann/json/issues/3727)
+- INT64\_MIN/MAX not defined for newer g++ [\#3722](https://github.com/nlohmann/json/issues/3722)
+- Compilation error with JSON\_DIAGNOSTICS enabled [\#3717](https://github.com/nlohmann/json/issues/3717)
+- class-level enum not serialized as string via NLOHMANN\_JSON\_SERIALIZE\_ENUM [\#3715](https://github.com/nlohmann/json/issues/3715)
+- Local copy given by operator\[\] or at\(\)  [\#3704](https://github.com/nlohmann/json/issues/3704)
+- nlohmann::to\_json method not acting as expected with nlohmann::adl\_serializer specialization. [\#3340](https://github.com/nlohmann/json/issues/3340)
+- braced-init-list: array vs other constructor [\#2583](https://github.com/nlohmann/json/issues/2583)
+
+- JSON for Modern C++ 3.11.3 [\#4222](https://github.com/nlohmann/json/pull/4222) ([nlohmann](https://github.com/nlohmann))
+- Update documentation for the next release [\#4216](https://github.com/nlohmann/json/pull/4216) ([nlohmann](https://github.com/nlohmann))
+- Fix failing CI checks [\#4215](https://github.com/nlohmann/json/pull/4215) ([colbychaskell](https://github.com/colbychaskell))
+- Fix CI \(again\) [\#4196](https://github.com/nlohmann/json/pull/4196) ([nlohmann](https://github.com/nlohmann))
+- fix cmake header path in install with custom CMAKE\_INSTALL\_INCLUDEDIR [\#4194](https://github.com/nlohmann/json/pull/4194) ([bebuch](https://github.com/bebuch))
+- Add more specific error message when attempting to parse empty input [\#4180](https://github.com/nlohmann/json/pull/4180) ([colbychaskell](https://github.com/colbychaskell))
+- Fix char\_traits deprecation warning [\#4179](https://github.com/nlohmann/json/pull/4179) ([colbychaskell](https://github.com/colbychaskell))
+- Fix MinGW CI [\#4175](https://github.com/nlohmann/json/pull/4175) ([scribam](https://github.com/scribam))
+- Fix spellcheck issue [\#4173](https://github.com/nlohmann/json/pull/4173) ([mwestphal](https://github.com/mwestphal))
+- Fix source highlighting in user defined type macros docs [\#4169](https://github.com/nlohmann/json/pull/4169) ([ZeronSix](https://github.com/ZeronSix))
+- Fix deprecation warning [\#4161](https://github.com/nlohmann/json/pull/4161) ([nlohmann](https://github.com/nlohmann))
+- Fix CI [\#4160](https://github.com/nlohmann/json/pull/4160) ([nlohmann](https://github.com/nlohmann))
+- Update index.md [\#4159](https://github.com/nlohmann/json/pull/4159) ([miny1233](https://github.com/miny1233))
+- Update index.md [\#4149](https://github.com/nlohmann/json/pull/4149) ([HO-COOH](https://github.com/HO-COOH))
+- Correct a typo in serve\_header/README.md [\#4143](https://github.com/nlohmann/json/pull/4143) ([felixonmars](https://github.com/felixonmars))
+- Fixed init-list construction when size\_type is not int [\#4140](https://github.com/nlohmann/json/pull/4140) ([tomalakgeretkal](https://github.com/tomalakgeretkal))
+- Update CODEOWNERS [\#4126](https://github.com/nlohmann/json/pull/4126) ([tarolling](https://github.com/tarolling))
+- Accept NEW CMake policies up to CMake 3.14 [\#4112](https://github.com/nlohmann/json/pull/4112) ([craigscott-crascit](https://github.com/craigscott-crascit))
+- Fix typo in afl\_driver.cpp [\#4109](https://github.com/nlohmann/json/pull/4109) ([eltociear](https://github.com/eltociear))
+- Capture exceptions by const& in docs. [\#4099](https://github.com/nlohmann/json/pull/4099) ([iwanders](https://github.com/iwanders))
+- Fix CI, again [\#4083](https://github.com/nlohmann/json/pull/4083) ([nlohmann](https://github.com/nlohmann))
+- Fix Clang-Tidy warnings [\#4047](https://github.com/nlohmann/json/pull/4047) ([nlohmann](https://github.com/nlohmann))
+- Fix compile error with \_HAS\_STATIC\_RTTI=0 [\#4046](https://github.com/nlohmann/json/pull/4046) ([ALF-ONE](https://github.com/ALF-ONE))
+- Add to CONTRIBUTING.md that `make pretty` is required for test updates. [\#4045](https://github.com/nlohmann/json/pull/4045) ([gregmarr](https://github.com/gregmarr))
+- Added to tests the file unit-algorithm.cpp \(c++ 11\) functions from algorithm library [\#4044](https://github.com/nlohmann/json/pull/4044) ([Tomerkm](https://github.com/Tomerkm))
+- Use template get instead of get in examples [\#4039](https://github.com/nlohmann/json/pull/4039) ([tusooa](https://github.com/tusooa))
+- Support Apple's Swift Package Manager [\#4010](https://github.com/nlohmann/json/pull/4010) ([aleksproger](https://github.com/aleksproger))
+- Add Vcpkg port version badge [\#3988](https://github.com/nlohmann/json/pull/3988) ([njakob](https://github.com/njakob))
+- Fix CI + new Doctest [\#3985](https://github.com/nlohmann/json/pull/3985) ([nlohmann](https://github.com/nlohmann))
+- Set minimal permissions to Github Workflows [\#3972](https://github.com/nlohmann/json/pull/3972) ([joycebrum](https://github.com/joycebrum))
+- Refactor amalgamation workflow to avoid dangerous use of pull\_request\_target [\#3969](https://github.com/nlohmann/json/pull/3969) ([joycebrum](https://github.com/joycebrum))
+- Fix typo in test.cmake [\#3951](https://github.com/nlohmann/json/pull/3951) ([theevilone45](https://github.com/theevilone45))
+- tests/unit-iterators2: use std::ranges::equals for range comparisons [\#3950](https://github.com/nlohmann/json/pull/3950) ([ArsenArsen](https://github.com/ArsenArsen))
+- 3935, removed lgtm badge and added Cirrus CI badge [\#3937](https://github.com/nlohmann/json/pull/3937) ([haadfida](https://github.com/haadfida))
+- ⬆️ Bump future from 0.18.2 to 0.18.3 in /docs/mkdocs [\#3934](https://github.com/nlohmann/json/pull/3934) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Change 2022 to 2023 [\#3932](https://github.com/nlohmann/json/pull/3932) ([floriansegginger](https://github.com/floriansegginger))
+- PrettyPrinter: Check if match is valid before accessing group [\#3920](https://github.com/nlohmann/json/pull/3920) ([Finkman](https://github.com/Finkman))
+- Fix CI issues [\#3906](https://github.com/nlohmann/json/pull/3906) ([barcode](https://github.com/barcode))
+- Prevent memory leak when exception is thrown in adl\_serializer::to\_json [\#3901](https://github.com/nlohmann/json/pull/3901) ([barcode](https://github.com/barcode))
+- custom allocators: define missing 'rebind' type [\#3895](https://github.com/nlohmann/json/pull/3895) ([trofi](https://github.com/trofi))
+- Try old MinGW script [\#3892](https://github.com/nlohmann/json/pull/3892) ([nlohmann](https://github.com/nlohmann))
+- Upgrade Python packages [\#3891](https://github.com/nlohmann/json/pull/3891) ([nlohmann](https://github.com/nlohmann))
+- Fix warning about moved from object [\#3889](https://github.com/nlohmann/json/pull/3889) ([nlohmann](https://github.com/nlohmann))
+- Remove a magic number [\#3888](https://github.com/nlohmann/json/pull/3888) ([nlohmann](https://github.com/nlohmann))
+- Add migration guide [\#3887](https://github.com/nlohmann/json/pull/3887) ([nlohmann](https://github.com/nlohmann))
+- Clang 15 [\#3876](https://github.com/nlohmann/json/pull/3876) ([nlohmann](https://github.com/nlohmann))
+- Bump certifi from 2022.6.15 to 2022.12.7 in /docs/mkdocs [\#3872](https://github.com/nlohmann/json/pull/3872) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Fix natvis XML [\#3863](https://github.com/nlohmann/json/pull/3863) ([nlohmann](https://github.com/nlohmann))
+- Fix pipeline [\#3862](https://github.com/nlohmann/json/pull/3862) ([nlohmann](https://github.com/nlohmann))
+- Add CIFuzz CI GitHub action [\#3845](https://github.com/nlohmann/json/pull/3845) ([DavidKorczynski](https://github.com/DavidKorczynski))
+- Add serialization-only user defined type macros [\#3816](https://github.com/nlohmann/json/pull/3816) ([ZeronSix](https://github.com/ZeronSix))
+- Bump joblib from 1.1.0 to 1.2.0 in /docs/mkdocs [\#3781](https://github.com/nlohmann/json/pull/3781) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Fix some typos for n-dimensional arrays [\#3767](https://github.com/nlohmann/json/pull/3767) ([striezel](https://github.com/striezel))
+- Fix 'declaration hides global declaration' warning [\#3751](https://github.com/nlohmann/json/pull/3751) ([falbrechtskirchinger](https://github.com/falbrechtskirchinger))
+- Fix typos in .md files [\#3748](https://github.com/nlohmann/json/pull/3748) ([tocic](https://github.com/tocic))
+- Update Codacy link [\#3740](https://github.com/nlohmann/json/pull/3740) ([nlohmann](https://github.com/nlohmann))
+- Add missing files to release artifacts [\#3728](https://github.com/nlohmann/json/pull/3728) ([falbrechtskirchinger](https://github.com/falbrechtskirchinger))
+- Add dark mode toggle to documentation [\#3726](https://github.com/nlohmann/json/pull/3726) ([falbrechtskirchinger](https://github.com/falbrechtskirchinger))
+- Add clang-tools to required tools for ci\_static\_analysis\_clang [\#3724](https://github.com/nlohmann/json/pull/3724) ([nlohmann](https://github.com/nlohmann))
+- Replace limit macros with std::numeric\_limits [\#3723](https://github.com/nlohmann/json/pull/3723) ([falbrechtskirchinger](https://github.com/falbrechtskirchinger))
+- Add missing \<numeric\> include [\#3719](https://github.com/nlohmann/json/pull/3719) ([falbrechtskirchinger](https://github.com/falbrechtskirchinger))
+- Add Bazel build support [\#3709](https://github.com/nlohmann/json/pull/3709) ([Vertexwahn](https://github.com/Vertexwahn))
+- Use official Clang/GCC containers [\#3703](https://github.com/nlohmann/json/pull/3703) ([nlohmann](https://github.com/nlohmann))
+- Add 'Check amalgamation' workflow [\#3693](https://github.com/nlohmann/json/pull/3693) ([falbrechtskirchinger](https://github.com/falbrechtskirchinger))
+- Allow custom base class as node customization point [\#3110](https://github.com/nlohmann/json/pull/3110) ([barcode](https://github.com/barcode))
+
+## [v3.11.2](https://github.com/nlohmann/json/releases/tag/v3.11.2) (2022-08-12)
+
+[Full Changelog](https://github.com/nlohmann/json/compare/v3.11.1...v3.11.2)
 
 - MSVC natvis visualizer does not work after introduction of inline ABI namespace [\#3696](https://github.com/nlohmann/json/issues/3696)
 - The use of parenthesis gives compilation errors in some situations [\#3682](https://github.com/nlohmann/json/issues/3682)
@@ -145,7 +476,7 @@ All notable changes to this project will be documented in this file. This projec
 - Fix warning [\#3634](https://github.com/nlohmann/json/pull/3634) ([nlohmann](https://github.com/nlohmann))
 - Add license header to new files [\#3633](https://github.com/nlohmann/json/pull/3633) ([nlohmann](https://github.com/nlohmann))
 - Add a unit test including windows.h [\#3631](https://github.com/nlohmann/json/pull/3631) ([falbrechtskirchinger](https://github.com/falbrechtskirchinger))
-- Fixed latest build error in msvc platform [\#3630](https://github.com/nlohmann/json/pull/3630) ([KsaNL](https://github.com/KsaNL))
+- Fixed latest build error in msvc platform [\#3630](https://github.com/nlohmann/json/pull/3630) ([Lioncky](https://github.com/Lioncky))
 - Add regression tests for \#3204 and \#3333 [\#3629](https://github.com/nlohmann/json/pull/3629) ([falbrechtskirchinger](https://github.com/falbrechtskirchinger))
 - Fix patch::add creating nonexistent parents [\#3628](https://github.com/nlohmann/json/pull/3628) ([falbrechtskirchinger](https://github.com/falbrechtskirchinger))
 - Adjust JSON Pointer examples [\#3622](https://github.com/nlohmann/json/pull/3622) ([nlohmann](https://github.com/nlohmann))
@@ -178,7 +509,7 @@ All notable changes to this project will be documented in this file. This projec
 - Use REUSE framework [\#3546](https://github.com/nlohmann/json/pull/3546) ([nlohmann](https://github.com/nlohmann))
 - Use `std::iterator_traits` to extract `iterator_category` [\#3544](https://github.com/nlohmann/json/pull/3544) ([Mike-Leo-Smith](https://github.com/Mike-Leo-Smith))
 - BJData dimension length can not be string\_t::npos, fix \#3541 [\#3543](https://github.com/nlohmann/json/pull/3543) ([fangq](https://github.com/fangq))
-- Allow disabling default enum conversions [\#3536](https://github.com/nlohmann/json/pull/3536) ([zxey](https://github.com/zxey))
+- Allow disabling default enum conversions [\#3536](https://github.com/nlohmann/json/pull/3536) ([richardhozak](https://github.com/richardhozak))
 - Add to\_json\(\) for std::vector\<bool\>::reference [\#3534](https://github.com/nlohmann/json/pull/3534) ([falbrechtskirchinger](https://github.com/falbrechtskirchinger))
 - CI: Enable 32bit unit test \(3\) [\#3532](https://github.com/nlohmann/json/pull/3532) ([falbrechtskirchinger](https://github.com/falbrechtskirchinger))
 - Use new CI image [\#3528](https://github.com/nlohmann/json/pull/3528) ([nlohmann](https://github.com/nlohmann))
@@ -639,7 +970,6 @@ All notable changes to this project will be documented in this file. This projec
 - array\_index possible out of range [\#2205](https://github.com/nlohmann/json/issues/2205)
 - Object deserialized as array [\#2204](https://github.com/nlohmann/json/issues/2204)
 - Sending to a function a reference to a sub-branch [\#2200](https://github.com/nlohmann/json/issues/2200)
-- How to Serialize derived class to JSON object?  [\#2199](https://github.com/nlohmann/json/issues/2199)
 - JSON incorrectly serialized [\#2198](https://github.com/nlohmann/json/issues/2198)
 - Exception Unhandled out\_of\_range error [\#2197](https://github.com/nlohmann/json/issues/2197)
 - msgpack serialisation : float is treated as 64bit float, not 32bit float. [\#2196](https://github.com/nlohmann/json/issues/2196)
@@ -672,7 +1002,6 @@ All notable changes to this project will be documented in this file. This projec
 - Compilation failure using Clang on Windows [\#1898](https://github.com/nlohmann/json/issues/1898)
 - Fail to build when including json.hpp as a system include [\#1818](https://github.com/nlohmann/json/issues/1818)
 - Parsing string into json doesn't preserve the order correctly. [\#1817](https://github.com/nlohmann/json/issues/1817)
-- \[C++17\] Allow std::optional to convert to nlohmann::json [\#1749](https://github.com/nlohmann/json/issues/1749)
 - How can I save json object in file in order?  [\#1717](https://github.com/nlohmann/json/issues/1717)
 - Support for Comments [\#1513](https://github.com/nlohmann/json/issues/1513)
 - clang compiler: error : unknown type name 'not' [\#1119](https://github.com/nlohmann/json/issues/1119)
@@ -1692,7 +2021,7 @@ All notable changes to this project will be documented in this file. This projec
 - Use a version check to provide backwards comatible CMake imported target names [\#1245](https://github.com/nlohmann/json/pull/1245) ([chuckatkins](https://github.com/chuckatkins))
 - Fix issue \#1237 [\#1238](https://github.com/nlohmann/json/pull/1238) ([theodelrieu](https://github.com/theodelrieu))
 - Add a get overload taking a parameter. [\#1231](https://github.com/nlohmann/json/pull/1231) ([theodelrieu](https://github.com/theodelrieu))
-- Move lambda out of unevaluated context [\#1230](https://github.com/nlohmann/json/pull/1230) ([mandreyel](https://github.com/mandreyel))
+- Move lambda out of unevaluated context [\#1230](https://github.com/nlohmann/json/pull/1230) ([vimpunk](https://github.com/vimpunk))
 - Remove static asserts [\#1228](https://github.com/nlohmann/json/pull/1228) ([theodelrieu](https://github.com/theodelrieu))
 - Better error 305 [\#1221](https://github.com/nlohmann/json/pull/1221) ([rivertam](https://github.com/rivertam))
 - Fix \#1213 [\#1214](https://github.com/nlohmann/json/pull/1214) ([simnalamburt](https://github.com/simnalamburt))
@@ -1859,8 +2188,8 @@ All notable changes to this project will be documented in this file. This projec
 - Fix unit tests that were silently skipped or crashed \(depending on the compiler\) [\#1176](https://github.com/nlohmann/json/pull/1176) ([grembo](https://github.com/grembo))
 - Refactor/no virtual sax [\#1153](https://github.com/nlohmann/json/pull/1153) ([theodelrieu](https://github.com/theodelrieu))
 - Fixed compiler error in VS 2015 for debug mode [\#1151](https://github.com/nlohmann/json/pull/1151) ([sonulohani](https://github.com/sonulohani))
-- Fix links to cppreference named requirements \(formerly concepts\) [\#1144](https://github.com/nlohmann/json/pull/1144) ([jrakow](https://github.com/jrakow))
-- meson: fix include directory [\#1142](https://github.com/nlohmann/json/pull/1142) ([jrakow](https://github.com/jrakow))
+- Fix links to cppreference named requirements \(formerly concepts\) [\#1144](https://github.com/nlohmann/json/pull/1144) ([ghost](https://github.com/ghost))
+- meson: fix include directory [\#1142](https://github.com/nlohmann/json/pull/1142) ([ghost](https://github.com/ghost))
 - Feature/unordered map conversion [\#1138](https://github.com/nlohmann/json/pull/1138) ([theodelrieu](https://github.com/theodelrieu))
 - fixed compile error for \#1045 [\#1134](https://github.com/nlohmann/json/pull/1134) ([Daniel599](https://github.com/Daniel599))
 -  test \(non\)equality for alt\_string implementation  [\#1130](https://github.com/nlohmann/json/pull/1130) ([agrianius](https://github.com/agrianius))
@@ -1869,7 +2198,7 @@ All notable changes to this project will be documented in this file. This projec
 - fix typo in README [\#1078](https://github.com/nlohmann/json/pull/1078) ([martin-mfg](https://github.com/martin-mfg))
 - Fix typo [\#1058](https://github.com/nlohmann/json/pull/1058) ([dns13](https://github.com/dns13))
 - Misc cmake packaging enhancements [\#1048](https://github.com/nlohmann/json/pull/1048) ([chuckatkins](https://github.com/chuckatkins))
-- Fixed incorrect LLVM version number in README [\#1047](https://github.com/nlohmann/json/pull/1047) ([jammehcow](https://github.com/jammehcow))
+- Fixed incorrect LLVM version number in README [\#1047](https://github.com/nlohmann/json/pull/1047) ([jupjohn](https://github.com/jupjohn))
 - Fix trivial typo in comment. [\#1043](https://github.com/nlohmann/json/pull/1043) ([coryan](https://github.com/coryan))
 - Package Manager: Spack [\#1041](https://github.com/nlohmann/json/pull/1041) ([ax3l](https://github.com/ax3l))
 - CMake: 3.8+ is Sufficient [\#1040](https://github.com/nlohmann/json/pull/1040) ([ax3l](https://github.com/ax3l))
@@ -2398,7 +2727,7 @@ All notable changes to this project will be documented in this file. This projec
 - Fix "not constraint" grammar in docs [\#674](https://github.com/nlohmann/json/pull/674) ([wincent](https://github.com/wincent))
 - Add documentation for integration with CMake and hunter [\#671](https://github.com/nlohmann/json/pull/671) ([dan-42](https://github.com/dan-42))
 - REFACTOR: rewrite CMakeLists.txt for better inlcude and reuse [\#669](https://github.com/nlohmann/json/pull/669) ([dan-42](https://github.com/dan-42))
-- enable\_testing only if the JSON\_BuildTests is ON [\#666](https://github.com/nlohmann/json/pull/666) ([effolkronium](https://github.com/effolkronium))
+- enable\_testing only if the JSON\_BuildTests is ON [\#666](https://github.com/nlohmann/json/pull/666) ([ilqvya](https://github.com/ilqvya))
 - Support moving from rvalues in std::initializer\_list [\#663](https://github.com/nlohmann/json/pull/663) ([himikof](https://github.com/himikof))
 - add ensure\_ascii parameter to dump. \#330 [\#654](https://github.com/nlohmann/json/pull/654) ([ryanjmulder](https://github.com/ryanjmulder))
 - Rename BuildTests to JSON\_BuildTests [\#652](https://github.com/nlohmann/json/pull/652) ([olegendo](https://github.com/olegendo))
@@ -2917,11 +3246,11 @@ All notable changes to this project will be documented in this file. This projec
 - Keyword 'inline' is useless when member functions are defined in headers [\#87](https://github.com/nlohmann/json/pull/87) ([ahamez](https://github.com/ahamez))
 - Remove useless typename [\#86](https://github.com/nlohmann/json/pull/86) ([ahamez](https://github.com/ahamez))
 - Avoid warning with Xcode's clang [\#85](https://github.com/nlohmann/json/pull/85) ([ahamez](https://github.com/ahamez))
--  Fix typos [\#73](https://github.com/nlohmann/json/pull/73) ([aqnouch](https://github.com/aqnouch))
+-  Fix typos [\#73](https://github.com/nlohmann/json/pull/73) ([maqnouch](https://github.com/maqnouch))
 - Replace `default_callback` function with `nullptr` and check for null… [\#72](https://github.com/nlohmann/json/pull/72) ([aburgh](https://github.com/aburgh))
 - support enum [\#71](https://github.com/nlohmann/json/pull/71) ([likebeta](https://github.com/likebeta))
 - Fix performance regression introduced with the parsing callback feature. [\#69](https://github.com/nlohmann/json/pull/69) ([aburgh](https://github.com/aburgh))
-- Improve the implementations of the comparission-operators [\#63](https://github.com/nlohmann/json/pull/63) ([Florianjw](https://github.com/Florianjw))
+- Improve the implementations of the comparission-operators [\#63](https://github.com/nlohmann/json/pull/63) ([Fiona-J-W](https://github.com/Fiona-J-W))
 - Fix compilation of json\_unit with GCC 5 [\#59](https://github.com/nlohmann/json/pull/59) ([dkopecek](https://github.com/dkopecek))
 - Parse streams incrementally. [\#40](https://github.com/nlohmann/json/pull/40) ([aburgh](https://github.com/aburgh))
 - Feature/small float serialization [\#38](https://github.com/nlohmann/json/pull/38) ([jrandall](https://github.com/jrandall))

FILES.md

@@ -0,0 +1,239 @@
+# Supporting files
+
+This file describes the source for supporting files; that is, files that are not part of the library, but define the infrastructure and other aspects of the project.
+
+- [Continuous Integration](#continuous-integration)
+- [GitHub](#github)
+- [REUSE](#reuse)
+- [Package Managers](#package-managers)
+
+## Continuous Integration
+
+### `.cirrus.yml`
+
+Configuration file for the pipeline at [Cirrus CI](https://cirrus-ci.com/github/nlohmann/json).
+
+Further documentation:
+
+- [Writing tasks](https://cirrus-ci.org/guide/writing-tasks/)
+
+> [!IMPORTANT]
+> The filename `.cirrus.yml` and position (root of the repository) are predetermined by Cirrus CI.
+
+### `.github/external_ci/appveyor.yml`
+
+Configuration for the pipelines at [AppVeyor](https://ci.appveyor.com/project/nlohmann/json).
+
+Further documentation:
+
+- [appveyor.yml reference](https://www.appveyor.com/docs/appveyor-yml/)
+
+> [!NOTE]
+> The filename can be freely configured in the AppVeyor project.
+
+## GitHub
+
+### `CITATION.cff`
+
+A file to configure the citation for the repository which is displayed in the sidebar of the project.
+
+Further documentation:
+
+- [About CITATION files](https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-citation-files)
+
+> [!IMPORTANT]
+> The filename `CITATION.cff` and position (root of the repository) are predetermined by GitHub.
+
+### `.github/CODE_OF_CONDUCT.md`
+
+The code of conduct for the project. This is the Markdown version of the [Contributor Covenant Code of Conduct](https://www.contributor-covenant.org/version/2/1/code_of_conduct/). The code of conduct is linked on the [Community Standards](https://github.com/nlohmann/json/community) page and is mentioned by the Sentiment Bot.
+
+Further documentation:
+
+- [Adding a code of conduct to your project](https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/adding-a-code-of-conduct-to-your-project)
+
+> [!IMPORTANT]
+> The filename `.github/CODE_OF_CONDUCT.md` is predetermined by GitHub.
+
+> [!NOTE]
+> The file is part of the documentation and is included in `docs/mkdocs/docs/community/code_of_conduct.md`.
+
+### `.github/CODEOWNERS`
+
+The code owners file for the project which is used to select reviewers for new pull requests.
+
+Further documentation:
+
+- [About code owners](https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners)
+
+> [!IMPORTANT]
+> The filename `.github/CODEOWNERS` is predetermined by GitHub.
+
+### `.github/config.yml`
+
+Configuration file for [probot](https://probot.github.io/apps/), in particular the [Sentiment Bot](https://probot.github.io/apps/sentiment-bot/) and the [Request Info](https://probot.github.io/apps/request-info/).
+
+> [!IMPORTANT]
+> The filename `.github/config.yml` is predetermined by probot.
+
+### `.github/CONTRIBUTING.md`
+
+The contribution guidelines which are linked in the [Community Standards](https://github.com/nlohmann/json/community) and at <https://github.com/nlohmann/json/contribute>.
+
+Further documentation:
+
+- [Setting guidelines for repository contributors](https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/setting-guidelines-for-repository-contributors)
+
+> [!IMPORTANT]
+> The filename `.github/CONTRIBUTING.md` is predetermined by GitHub.
+
+> [!NOTE]
+> The file is part of the documentation and is included in `docs/mkdocs/docs/community/contribution_guidelines.md`.
+
+### `.github/dependabot.yml`
+
+The configuration of [dependabot](https://github.com/dependabot) which ensures the dependencies (GitHub actions and Python packages used in the CI) remain up to date.
+
+Further documentation:
+
+- [Configuring Dependabot security updates](https://docs.github.com/en/code-security/dependabot/dependabot-security-updates/configuring-dependabot-security-updates)
+
+> [!IMPORTANT]
+> The filename `.github/dependabot.yml` is predetermined by GitHub.
+
+### `.github/FUNDING.yml`
+
+A file to configure the sponsor button of the repository which is displayed in the sidebar of the project.
+
+Further documentation:
+
+- [Displaying a sponsor button in your repository](https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/displaying-a-sponsor-button-in-your-repository)
+
+> [!IMPORTANT]
+> The filename `.github/FUNDING.yml` is predetermined by GitHub.
+
+### `.github/ISSUE_TEMPLATE/bug.yaml`
+
+Issue form template for bugs.
+
+Further documentation:
+
+- [Configuring issue templates for your repository](https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository)
+
+> [!IMPORTANT]
+> The folder `.github/ISSUE_TEMPLATE` is predetermined by GitHub.
+
+### `.github/ISSUE_TEMPLATE/config.yaml`
+
+Issue template chooser configuration. The file is used to configure the dialog when a new issue is created.
+
+Further documentation:
+
+- [Configuring issue templates for your repository](https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository)
+
+> [!IMPORTANT]
+> The filename `.github/ISSUE_TEMPLATE/config.yaml` is predetermined by GitHub.
+
+### `.github/labeler.yml`
+
+Configuration file for the "Pull Request Labeler" workflow defined in `workflows/labeler.yml`. This file defines rules how labels are assigned to pull requests based on which files are changed.
+
+Further documentation:
+
+- [Label manager for PRs and issues based on configurable conditions](https://github.com/srvaroa/labeler)
+
+> [!NOTE]
+> The filename defaults to `.github/labeler.yml` and can be configured in the workflow.
+
+### `.github/PULL_REQUEST_TEMPLATE.md`
+
+The pull request template which prefills new pull requests.
+
+Further documentation:
+
+- [Creating a pull request template for your repository](https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/creating-a-pull-request-template-for-your-repository)
+
+> [!IMPORTANT]
+> The filename `.github/PULL_REQUEST_TEMPLATE.md` is predetermined by GitHub.
+
+### `.github/SECURITY.md`
+
+The goal is to describe how to securely report security vulnerabilities for this repository. The security policy is linked at <https://github.com/nlohmann/json/security/policy>.
+
+Further documentation:
+
+- [Adding a security policy to your repository](https://docs.github.com/en/code-security/getting-started/adding-a-security-policy-to-your-repository)
+
+> [!IMPORTANT]
+> The filename `.github/SECURITY.yml` is predetermined by GitHub.
+
+> [!NOTE]
+> The file is part of the documentation and is included in `docs/mkdocs/docs/community/security_policy.md`.
+
+### `LICENSE.MIT`
+
+The license of the project.
+
+Further documentation:
+
+- [Adding a license to a repository](https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/adding-a-license-to-a-repository)
+
+> [!IMPORTANT]
+> The filename `LICENSE.MIT` is partly predetermined by GitHub. The root filename must be `LICENSE`.
+
+## REUSE
+
+### `.reuse/dep5`
+
+The file defines the licenses of certain third-party components in the repository. The root `Makefile` contains a target `reuse` that checks for compliance.
+
+Further documentation:
+
+- [DEP5](https://reuse.software/spec-3.2/#dep5-deprecated)
+- [reuse command-line tool](https://pypi.org/project/reuse/)
+- [documentation of linting](https://reuse.readthedocs.io/en/stable/man/reuse-lint.html)
+- [REUSE](http://reuse.software)
+
+> [!IMPORTANT]
+> The filename `.reuse/dep5` is predetermined by REUSE. Alternatively, a `REUSE.toml` file can be used.
+
+### `.reuse/templates`
+
+Copyright header templates for source files. The root `Makefile` contains a target `reuse` that updates copyright headers with the templates.
+
+Further information:
+
+- [reuse command-line tool](https://pypi.org/project/reuse/)
+- [documentation on templates](https://reuse.readthedocs.io/en/stable/man/reuse-annotate.html#cmdoption-t)
+- [REUSE](http://reuse.software)
+
+> [!IMPORTANT]
+> The folder name `.reuse/templates` is predetermined by REUSE.
+
+### `LICENSES`
+
+A folder that contains every license of all license files (library and third-party code).
+
+Further documentation:
+
+- [REUSE specification](https://reuse.software/spec-3.3/)
+
+> [!IMPORTANT]
+> The folder name `LICENSES` is predetermined by REUSE.
+
+
+## Package Managers
+
+### `BUILD.bazel`
+
+The file can be updated by calling
+
+```shell
+make BUILD.bazel
+```
+
+### `meson.build`
+
+### `Package.swift`
+
+### `WORKSPACE.bazel`

LICENSE.MIT

@@ -1,6 +1,6 @@
 MIT License 
 
-Copyright (c) 2013-2022 Niels Lohmann
+Copyright (c) 2013-2026 Niels Lohmann
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

LICENSES/CC0-1.0.txt

@@ -0,0 +1,121 @@
+Creative Commons Legal Code
+
+CC0 1.0 Universal
+
+    CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE
+    LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN
+    ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS
+    INFORMATION ON AN "AS-IS" BASIS. CREATIVE COMMONS MAKES NO WARRANTIES
+    REGARDING THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS
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MODULE.bazel

@@ -0,0 +1,7 @@
+module(
+    name = "nlohmann_json",
+    compatibility_level = 1,
+)
+
+bazel_dep(name = "rules_cc", version = "0.0.17")
+bazel_dep(name = "rules_license", version = "1.0.0")

Makefile

@@ -43,15 +43,6 @@ all:
 	@echo "run_benchmarks - build and run benchmarks"
 
 
-##########################################################################
-# documentation tests
-##########################################################################
-
-# compile example files and check output
-doctest:
-	$(MAKE) check_output -C docs
-
-
 ##########################################################################
 # benchmarks
 ##########################################################################
@@ -142,32 +133,20 @@ pvs_studio:
 # Code format and source amalgamation
 ##########################################################################
 
+ASTYLE=tools/astyle/venv/bin/astyle
+
+install_astyle:
+	@test -d tools/astyle/venv || python3 -mvenv tools/astyle/venv ; tools/astyle/venv/bin/pip3 install --quiet --upgrade pip
+	@test -f $(ASTYLE) || tools/astyle/venv/bin/pip3 install --quiet -r tools/astyle/requirements.txt
+	@$(ASTYLE) --version
+
 # call the Artistic Style pretty printer on all source files
-pretty:
-	astyle \
-	    --style=allman \
-	    --indent=spaces=4 \
-	    --indent-modifiers \
-	    --indent-switches \
-	    --indent-preproc-block \
-	    --indent-preproc-define \
-	    --indent-col1-comments \
-	    --pad-oper \
-	    --pad-header \
-	    --align-pointer=type \
-	    --align-reference=type \
-	    --add-brackets \
-	    --convert-tabs \
-	    --close-templates \
-	    --lineend=linux \
-	    --preserve-date \
-	    --suffix=none \
-	    --formatted \
-	   $(SRCS) $(TESTS_SRCS) $(AMALGAMATED_FILE) $(AMALGAMATED_FWD_FILE) docs/examples/*.cpp
+pretty: install_astyle
+	$(ASTYLE) --project=tools/astyle/.astylerc $(SRCS) $(TESTS_SRCS) $(AMALGAMATED_FILE) $(AMALGAMATED_FWD_FILE) docs/mkdocs/docs/examples/*.cpp
 
 # call the Clang-Format on all source files
 pretty_format:
-	for FILE in $(SRCS) $(TESTS_SRCS) $(AMALGAMATED_FILE) docs/examples/*.cpp; do echo $$FILE; clang-format -i $$FILE; done
+	for FILE in $(SRCS) $(TESTS_SRCS) $(AMALGAMATED_FILE) docs/mkdocs/docs/examples/*.cpp; do echo $$FILE; clang-format -i $$FILE; done
 
 # create single header files and pretty print
 amalgamate: $(AMALGAMATED_FILE) $(AMALGAMATED_FWD_FILE)
@@ -192,6 +171,8 @@ check-amalgamation:
 	@mv $(AMALGAMATED_FILE)~ $(AMALGAMATED_FILE)
 	@mv $(AMALGAMATED_FWD_FILE)~ $(AMALGAMATED_FWD_FILE)
 
+BUILD.bazel: $(SRCS)
+	cmake -P cmake/scripts/gen_bazel_build_file.cmake
 
 ##########################################################################
 # ChangeLog
@@ -213,7 +194,7 @@ ChangeLog.md:
 # Release files
 ##########################################################################
 
-# Create a tar.gz archive that contains sufficient files to be used as CMake project (e.g., using FetchContent). The
+# Create a tar.xz archive that contains sufficient files to be used as CMake project (e.g., using FetchContent). The
 # archive is created according to the advices of <https://reproducible-builds.org/docs/archives/>.
 json.tar.xz:
 	mkdir json
@@ -223,8 +204,8 @@ json.tar.xz:
 
 # We use `-X` to make the resulting ZIP file reproducible, see
 # <https://content.pivotal.io/blog/barriers-to-deterministic-reproducible-zip-files>.
-include.zip:
-	zip -9 --recurse-paths -X include.zip $(SRCS) $(AMALGAMATED_FILE) meson.build LICENSE.MIT
+include.zip: BUILD.bazel
+	zip -9 --recurse-paths -X include.zip $(SRCS) $(AMALGAMATED_FILE) $(AMALGAMATED_FWD_FILE) BUILD.bazel WORKSPACE.bazel meson.build LICENSE.MIT
 
 # Create the files for a release and add signatures and hashes.
 release: include.zip json.tar.xz
@@ -277,6 +258,9 @@ serve_header:
 ##########################################################################
 
 reuse:
-	pipx run reuse addheader --recursive single_include include -tjson --license MIT --copyright "Niels Lohmann <https://nlohmann.me>" --year "2013-2022"
-	pipx run reuse addheader $(TESTS_SRCS) --style=c -tjson_support --license MIT --copyright "Niels Lohmann <https://nlohmann.me>" --year "2013-2022"
+	pipx run reuse annotate --recursive single_include include -tjson --license MIT --copyright "Niels Lohmann <https://nlohmann.me>" --year "2013-2026" --merge-copyrights
+	pipx run reuse annotate $(TESTS_SRCS) -tjson_support --license MIT --copyright "Niels Lohmann <https://nlohmann.me>" --year "2013-2026" --merge-copyrights
 	pipx run reuse lint
+
+spdx:
+	pipx run reuse spdx --output nlohmann_json.spdx --creator-person "Niels Lohmann" --add-license-concluded

Package.swift

@@ -0,0 +1,22 @@
+// swift-tools-version: 5.9
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "nlohmann-json",
+     platforms: [
+        .iOS(.v12), .macOS(.v10_13), .tvOS(.v12), .watchOS(.v4), .visionOS(.v1)
+    ],
+    products: [
+        .library(name: "json", targets: ["json"])
+    ],
+    targets: [
+        .target(
+            name: "json",
+            path: "single_include/nlohmann",
+            publicHeadersPath: "."
+        )
+    ],
+    cxxLanguageStandard: .cxx11
+)

README.md

@@ -1,4 +1,4 @@
-[![JSON for Modern C++](docs/json.gif)](https://github.com/nlohmann/json/releases)
+[![JSON for Modern C++](docs/mkdocs/docs/images/json.gif)](https://github.com/nlohmann/json/releases)
 
 [![Build Status](https://ci.appveyor.com/api/projects/status/1acb366xfyg3qybk/branch/develop?svg=true)](https://ci.appveyor.com/project/nlohmann/json)
 [![Ubuntu](https://github.com/nlohmann/json/workflows/Ubuntu/badge.svg)](https://github.com/nlohmann/json/actions?query=workflow%3AUbuntu)
@@ -6,8 +6,8 @@
 [![Windows](https://github.com/nlohmann/json/workflows/Windows/badge.svg)](https://github.com/nlohmann/json/actions?query=workflow%3AWindows)
 [![Coverage Status](https://coveralls.io/repos/github/nlohmann/json/badge.svg?branch=develop)](https://coveralls.io/github/nlohmann/json?branch=develop)
 [![Coverity Scan Build Status](https://scan.coverity.com/projects/5550/badge.svg)](https://scan.coverity.com/projects/nlohmann-json)
-[![Codacy Badge](https://app.codacy.com/project/badge/Grade/e0d1a9d5d6fd46fcb655c4cb930bb3e8)](https://www.codacy.com/gh/nlohmann/json/dashboard?utm_source=github.com&utm_medium=referral&utm_content=nlohmann/json&utm_campaign=Badge_Grade)
-[![Language grade: C/C++](https://img.shields.io/lgtm/grade/cpp/g/nlohmann/json.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/nlohmann/json/context:cpp)
+[![Codacy Badge](https://app.codacy.com/project/badge/Grade/e0d1a9d5d6fd46fcb655c4cb930bb3e8)](https://app.codacy.com/gh/nlohmann/json/dashboard?utm_source=gh&utm_medium=referral&utm_content=&utm_campaign=Badge_grade)
+[![Cirrus CI](https://api.cirrus-ci.com/github/nlohmann/json.svg)](https://cirrus-ci.com/github/nlohmann/json)
 [![Fuzzing Status](https://oss-fuzz-build-logs.storage.googleapis.com/badges/json.svg)](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:json)
 [![Try online](https://img.shields.io/badge/try-online-blue.svg)](https://wandbox.org/permlink/1mp10JbaANo6FUc7)
 [![Documentation](https://img.shields.io/badge/docs-mkdocs-blue.svg)](https://json.nlohmann.me)
@@ -18,6 +18,8 @@
 [![GitHub Issues](https://img.shields.io/github/issues/nlohmann/json.svg)](https://github.com/nlohmann/json/issues)
 [![Average time to resolve an issue](https://isitmaintained.com/badge/resolution/nlohmann/json.svg)](https://isitmaintained.com/project/nlohmann/json "Average time to resolve an issue")
 [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/289/badge)](https://bestpractices.coreinfrastructure.org/projects/289)
+[![OpenSSF Scorecard](https://api.scorecard.dev/projects/github.com/nlohmann/json/badge)](https://scorecard.dev/viewer/?uri=github.com/nlohmann/json)
+[![Backup Status](https://app.cloudback.it/badge/nlohmann/json)](https://cloudback.it)
 [![GitHub Sponsors](https://img.shields.io/badge/GitHub-Sponsors-ff69b4)](https://github.com/sponsors/nlohmann)
 [![REUSE status](https://api.reuse.software/badge/github.com/nlohmann/json)](https://api.reuse.software/info/github.com/nlohmann/json)
 [![Discord](https://img.shields.io/discord/1003743314341793913)](https://discord.gg/6mrGXKvX7y)
@@ -25,10 +27,11 @@
 - [Design goals](#design-goals)
 - [Sponsors](#sponsors)
 - [Support](#support) ([documentation](https://json.nlohmann.me), [FAQ](https://json.nlohmann.me/home/faq/), [discussions](https://github.com/nlohmann/json/discussions), [API](https://json.nlohmann.me/api/basic_json/), [bug issues](https://github.com/nlohmann/json/issues))
+- [Quick reference](#quick-reference)
 - [Examples](#examples)
   - [Read JSON from a file](#read-json-from-a-file)
   - [Creating `json` objects from JSON literals](#creating-json-objects-from-json-literals)
-  - [JSON as first-class data type](#json-as-first-class-data-type)
+  - [JSON as a first-class data type](#json-as-a-first-class-data-type)
   - [Serialization / Deserialization](#serialization--deserialization)
   - [STL-like access](#stl-like-access)
   - [Conversion from STL containers](#conversion-from-stl-containers)
@@ -38,6 +41,7 @@
   - [Conversions to/from arbitrary types](#arbitrary-types-conversions)
   - [Specializing enum conversion](#specializing-enum-conversion)
   - [Binary formats (BSON, CBOR, MessagePack, UBJSON, and BJData)](#binary-formats-bson-cbor-messagepack-ubjson-and-bjdata)
+- [Customers](#customers)
 - [Supported compilers](#supported-compilers)
 - [Integration](#integration)
   - [CMake](#cmake)
@@ -47,7 +51,6 @@
 - [Contact](#contact)
 - [Thanks](#thanks)
 - [Used third-party tools](#used-third-party-tools)
-- [Projects using JSON for Modern C++](#projects-using-json-for-modern-c)
 - [Notes](#notes)
 - [Execute unit tests](#execute-unit-tests)
 
@@ -55,11 +58,11 @@
 
 There are myriads of [JSON](https://json.org) libraries out there, and each may even have its reason to exist. Our class had these design goals:
 
-- **Intuitive syntax**. In languages such as Python, JSON feels like a first class data type. We used all the operator magic of modern C++ to achieve the same feeling in your code. Check out the [examples below](#examples) and you'll know what I mean.
+- **Intuitive syntax**. In languages such as Python, JSON feels like a first-class data type. We used all the operator magic of modern C++ to achieve the same feeling in your code. Check out the [examples below](#examples) and you'll know what I mean.
 
-- **Trivial integration**. Our whole code consists of a single header file [`json.hpp`](https://github.com/nlohmann/json/blob/develop/single_include/nlohmann/json.hpp). That's it. No library, no subproject, no dependencies, no complex build system. The class is written in vanilla C++11. All in all, everything should require no adjustment of your compiler flags or project settings.
+- **Trivial integration**. Our whole code consists of a single header file [`json.hpp`](https://github.com/nlohmann/json/blob/develop/single_include/nlohmann/json.hpp). That's it. No library, no subproject, no dependencies, no complex build system. The class is written in vanilla C++11. All in all, everything should require no adjustment of your compiler flags or project settings. The library is also included in all popular [package managers](https://json.nlohmann.me/integration/package_managers/).
 
-- **Serious testing**. Our code is heavily [unit-tested](https://github.com/nlohmann/json/tree/develop/tests/src) and covers [100%](https://coveralls.io/r/nlohmann/json) of the code, including all exceptional behavior. Furthermore, we checked with [Valgrind](https://valgrind.org) and the [Clang Sanitizers](https://clang.llvm.org/docs/index.html) that there are no memory leaks. [Google OSS-Fuzz](https://github.com/google/oss-fuzz/tree/master/projects/json) additionally runs fuzz tests against all parsers 24/7, effectively executing billions of tests so far. To maintain high quality, the project is following the [Core Infrastructure Initiative (CII) best practices](https://bestpractices.coreinfrastructure.org/projects/289).
+- **Serious testing**. Our code is heavily [unit-tested](https://github.com/nlohmann/json/tree/develop/tests/src) and covers [100%](https://coveralls.io/r/nlohmann/json) of the code, including all exceptional behavior. Furthermore, we checked with [Valgrind](https://valgrind.org) and the [Clang Sanitizers](https://clang.llvm.org/docs/index.html) that there are no memory leaks. [Google OSS-Fuzz](https://github.com/google/oss-fuzz/tree/master/projects/json) additionally runs fuzz tests against all parsers 24/7, effectively executing billions of tests so far. To maintain high quality, the project is following the [Core Infrastructure Initiative (CII) best practices](https://bestpractices.coreinfrastructure.org/projects/289). See the [quality assurance](https://json.nlohmann.me/community/quality_assurance) overview documentation.
 
 Other aspects were not so important to us:
 
@@ -69,14 +72,15 @@ Other aspects were not so important to us:
 
 See the [contribution guidelines](https://github.com/nlohmann/json/blob/master/.github/CONTRIBUTING.md#please-dont) for more information.
 
-
 ## Sponsors
 
 You can sponsor this library at [GitHub Sponsors](https://github.com/sponsors/nlohmann).
 
-### :office: Corporate Sponsor
+### :raising_hand: Priority Sponsor
 
-[![](https://upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Codacy-logo-black.svg/320px-Codacy-logo-black.svg.png)](https://github.com/codacy)
+- [Martti Laine](https://github.com/codeclown)
+- [Paul Harrington](https://github.com/phrrngtn)
+- [Mercedes-Benz Group](https://github.com/mercedes-benz)
 
 ### :label: Named Sponsors
 
@@ -85,6 +89,13 @@ You can sponsor this library at [GitHub Sponsors](https://github.com/sponsors/nl
 - [Steve Sperandeo](https://github.com/homer6)
 - [Robert Jefe Lindstädt](https://github.com/eljefedelrodeodeljefe)
 - [Steve Wagner](https://github.com/ciroque)
+- [Lion Yang](https://github.com/LionNatsu)
+
+### Further support
+
+The development of the library is further supported by JetBrains by providing free access to their IDE tools.
+
+[![JetBrains logo.](https://resources.jetbrains.com/storage/products/company/brand/logos/jetbrains.svg)](https://jb.gg/OpenSourceSupport)
 
 Thanks everyone!
 
@@ -92,24 +103,46 @@ Thanks everyone!
 
 :question: If you have a **question**, please check if it is already answered in the [**FAQ**](https://json.nlohmann.me/home/faq/) or the [**Q&A**](https://github.com/nlohmann/json/discussions/categories/q-a) section. If not, please [**ask a new question**](https://github.com/nlohmann/json/discussions/new) there.
 
-:books: If you want to **learn more** about how to use the library, check out the rest of the [**README**](#examples), have a look at [**code examples**](https://github.com/nlohmann/json/tree/develop/docs/examples), or browse through the [**help pages**](https://json.nlohmann.me).
+:books: If you want to **learn more** about how to use the library, check out the rest of the [**README**](#examples), have a look at [**code examples**](https://github.com/nlohmann/json/tree/develop/docs/mkdocs/docs/examples), or browse through the [**help pages**](https://json.nlohmann.me).
 
-:construction: If you want to understand the **API** better, check out the [**API Reference**](https://json.nlohmann.me/api/basic_json/).
+:construction: If you want to understand the **API** better, check out the [**API Reference**](https://json.nlohmann.me/api/basic_json/) or have a look at the [quick reference](#quick-reference) below.
 
 :bug: If you found a **bug**, please check the [**FAQ**](https://json.nlohmann.me/home/faq/) if it is a known issue or the result of a design decision. Please also have a look at the [**issue list**](https://github.com/nlohmann/json/issues) before you [**create a new issue**](https://github.com/nlohmann/json/issues/new/choose). Please provide as much information as possible to help us understand and reproduce your issue.
 
-There is also a [**docset**](https://github.com/Kapeli/Dash-User-Contributions/tree/master/docsets/JSON_for_Modern_C%2B%2B) for the documentation browsers [Dash](https://kapeli.com/dash), [Velocity](https://velocity.silverlakesoftware.com), and [Zeal](https://zealdocs.org) that contains the full [documentation](https://json.nlohmann.me) as offline resource.
+There is also a [**docset**](https://github.com/Kapeli/Dash-User-Contributions/tree/master/docsets/JSON_for_Modern_C%2B%2B) for the documentation browsers [Dash](https://kapeli.com/dash), [Velocity](https://velocity.silverlakesoftware.com), and [Zeal](https://zealdocs.org) that contains the full [documentation](https://json.nlohmann.me) as an offline resource.
+
+## Quick reference
+
+- **Constructors** [basic_json](https://json.nlohmann.me/api/basic_json/basic_json), [array](https://json.nlohmann.me/api/basic_json/array), [binary](https://json.nlohmann.me/api/basic_json/binary), [object](https://json.nlohmann.me/api/basic_json/object)
+- **Object inspection**: [type](https://json.nlohmann.me/api/basic_json/type), [operator value_t](https://json.nlohmann.me/api/basic_json/operator_value_t), [type_name](https://json.nlohmann.me/api/basic_json/type_name), [is_primitive](https://json.nlohmann.me/api/basic_json/is_primitive), [is_structured](https://json.nlohmann.me/api/basic_json/is_structured), [is_null](https://json.nlohmann.me/api/basic_json/is_null), [is_boolean](https://json.nlohmann.me/api/basic_json/is_boolean), [is_number](https://json.nlohmann.me/api/basic_json/is_number), [is_number_integer](https://json.nlohmann.me/api/basic_json/is_number_integer), [is_number_unsigned](https://json.nlohmann.me/api/basic_json/is_number_unsigned), [is_number_float](https://json.nlohmann.me/api/basic_json/is_number_float), [is_object](https://json.nlohmann.me/api/basic_json/is_object), [is_array](https://json.nlohmann.me/api/basic_json/is_array), [is_string](https://json.nlohmann.me/api/basic_json/is_string), [is_binary](https://json.nlohmann.me/api/basic_json/is_binary), [is_discarded](https://json.nlohmann.me/api/basic_json/is_discarded)
+- **Value access**; [get](https://json.nlohmann.me/api/basic_json/get), [get_to](https://json.nlohmann.me/api/basic_json/get_to), [get_ptr](https://json.nlohmann.me/api/basic_json/get_ptr), [get_ref](https://json.nlohmann.me/api/basic_json/get_ref), [operator ValueType](https://json.nlohmann.me/api/basic_json/operator_ValueType), [get_binary](https://json.nlohmann.me/api/basic_json/get_binary)
+- **Element access**: [at](https://json.nlohmann.me/api/basic_json/at), [operator[]](https://json.nlohmann.me/api/basic_json/operator[]), [value](https://json.nlohmann.me/api/basic_json/value), [front](https://json.nlohmann.me/api/basic_json/front), [back](https://json.nlohmann.me/api/basic_json/back)
+- **Lookup**: [find](https://json.nlohmann.me/api/basic_json/find), [count](https://json.nlohmann.me/api/basic_json/count), [contains](https://json.nlohmann.me/api/basic_json/contains)
+- **Iterators**: [begin](https://json.nlohmann.me/api/basic_json/begin), [cbegin](https://json.nlohmann.me/api/basic_json/cbegin), [end](https://json.nlohmann.me/api/basic_json/end), [cend](https://json.nlohmann.me/api/basic_json/cend), [rbegin](https://json.nlohmann.me/api/basic_json/rbegin), [rend](https://json.nlohmann.me/api/basic_json/rend), [crbegin](https://json.nlohmann.me/api/basic_json/crbegin), [crend](https://json.nlohmann.me/api/basic_json/crend), [items](https://json.nlohmann.me/api/basic_json/items)
+- **Capacity**: [empty](https://json.nlohmann.me/api/basic_json/empty), [size](https://json.nlohmann.me/api/basic_json/size), [max_size](https://json.nlohmann.me/api/basic_json/max_size)
+- **Modifiers**: [clear](https://json.nlohmann.me/api/basic_json/clear), [push_back](https://json.nlohmann.me/api/basic_json/push_back), [operator+=](https://json.nlohmann.me/api/basic_json/operator+=), [emplace_back](https://json.nlohmann.me/api/basic_json/emplace_back), [emplace](https://json.nlohmann.me/api/basic_json/emplace), [erase](https://json.nlohmann.me/api/basic_json/erase), [insert](https://json.nlohmann.me/api/basic_json/insert), [update](https://json.nlohmann.me/api/basic_json/update), [swap](https://json.nlohmann.me/api/basic_json/swap)
+- **Lexicographical comparison operators**: [operator==](https://json.nlohmann.me/api/basic_json/operator_eq), [operator!=](https://json.nlohmann.me/api/basic_json/operator_ne), [operator<](https://json.nlohmann.me/api/basic_json/operator_lt), [operator>](https://json.nlohmann.me/api/basic_json/operator_gt), [operator<=](https://json.nlohmann.me/api/basic_json/operator_le), [operator>=](https://json.nlohmann.me/api/basic_json/operator_ge), [operator<=>](https://json.nlohmann.me/api/basic_json/operator_spaceship)
+- **Serialization / Dumping**: [dump](https://json.nlohmann.me/api/basic_json/dump)
+- **Deserialization / Parsing**: [parse](https://json.nlohmann.me/api/basic_json/parse), [accept](https://json.nlohmann.me/api/basic_json/accept), [sax_parse](https://json.nlohmann.me/api/basic_json/sax_parse)
+- **JSON Pointer functions**: [flatten](https://json.nlohmann.me/api/basic_json/flatten), [unflatten](https://json.nlohmann.me/api/basic_json/unflatten)
+- **JSON Patch functions**: [patch](https://json.nlohmann.me/api/basic_json/patch), [patch_inplace](https://json.nlohmann.me/api/basic_json/patch_inplace), [diff](https://json.nlohmann.me/api/basic_json/diff), [merge_patch](https://json.nlohmann.me/api/basic_json/merge_patch)
+- **Static functions**: [meta](https://json.nlohmann.me/api/basic_json/meta), [get_allocator](https://json.nlohmann.me/api/basic_json/get_allocator)
+- **Binary formats**: [from_bjdata](https://json.nlohmann.me/api/basic_json/from_bjdata), [from_bson](https://json.nlohmann.me/api/basic_json/from_bson), [from_cbor](https://json.nlohmann.me/api/basic_json/from_cbor), [from_msgpack](https://json.nlohmann.me/api/basic_json/from_msgpack), [from_ubjson](https://json.nlohmann.me/api/basic_json/from_ubjson), [to_bjdata](https://json.nlohmann.me/api/basic_json/to_bjdata), [to_bson](https://json.nlohmann.me/api/basic_json/to_bson), [to_cbor](https://json.nlohmann.me/api/basic_json/to_cbor), [to_msgpack](https://json.nlohmann.me/api/basic_json/to_msgpack), [to_ubjson](https://json.nlohmann.me/api/basic_json/to_ubjson)
+- **Non-member functions**: [operator<<](https://json.nlohmann.me/api/operator_ltlt/), [operator>>](https://json.nlohmann.me/api/operator_gtgt/), [to_string](https://json.nlohmann.me/api/basic_json/to_string)
+- **Literals**: [operator""_json](https://json.nlohmann.me/api/operator_literal_json)
+- **Helper classes**: [std::hash&lt;basic_json&gt;](https://json.nlohmann.me/api/basic_json/std_hash), [std::swap&lt;basic_json&gt;](https://json.nlohmann.me/api/basic_json/std_swap)
+
+[**Full API documentation**](https://json.nlohmann.me/api/basic_json/)
 
 ## Examples
 
 Here are some examples to give you an idea how to use the class.
 
-Beside the examples below, you may want to:
+Besides the examples below, you may want to:
 
 → Check the [documentation](https://json.nlohmann.me/)\
-→ Browse the [standalone example files](https://github.com/nlohmann/json/tree/develop/docs/examples)
-
-Every API function (documented in the [API Documentation](https://json.nlohmann.me/api/basic_json/)) has a corresponding standalone example file. For example, the [`emplace()`](https://json.nlohmann.me/api/basic_json/emplace/) function has a matching [emplace.cpp](https://github.com/nlohmann/json/blob/develop/docs/examples/emplace.cpp) example file.
+→ Browse the [standalone example files](https://github.com/nlohmann/json/tree/develop/docs/mkdocs/docs/examples)\
+→ Read the full [API Documentation](https://json.nlohmann.me/api/basic_json/) with self-contained examples for every function
 
 ### Read JSON from a file
 
@@ -126,6 +159,19 @@ std::ifstream f("example.json");
 json data = json::parse(f);
 ```
 
+If using modules (enabled with `NLOHMANN_JSON_BUILD_MODULES`), this example becomes:
+```cpp
+import std;
+import nlohmann.json;
+
+using json = nlohmann::json;
+
+// ...
+
+std::ifstream f("example.json");
+json data = json::parse(f);
+```
+
 ### Creating `json` objects from JSON literals
 
 Assume you want to create hard-code this literal JSON value in a file, as a `json` object:
@@ -164,7 +210,7 @@ json ex3 = {
 };
 ```
 
-### JSON as first-class data type
+### JSON as a first-class data type
 
 Here are some examples to give you an idea how to use the class.
 
@@ -193,13 +239,13 @@ With this library, you could write:
 // create an empty structure (null)
 json j;
 
-// add a number that is stored as double (note the implicit conversion of j to an object)
+// add a number stored as double (note the implicit conversion of j to an object)
 j["pi"] = 3.141;
 
-// add a Boolean that is stored as bool
+// add a Boolean stored as bool
 j["happy"] = true;
 
-// add a string that is stored as std::string
+// add a string stored as std::string
 j["name"] = "Niels";
 
 // add another null object by passing nullptr
@@ -208,7 +254,7 @@ j["nothing"] = nullptr;
 // add an object inside the object
 j["answer"]["everything"] = 42;
 
-// add an array that is stored as std::vector (using an initializer list)
+// add an array stored as std::vector (using an initializer list)
 j["list"] = { 1, 0, 2 };
 
 // add another object (using an initializer list of pairs)
@@ -268,7 +314,7 @@ Note that without appending the `_json` suffix, the passed string literal is not
 value. That is, `json j = "{ \"happy\": true, \"pi\": 3.141 }"` would just store the string
 `"{ "happy": true, "pi": 3.141 }"` rather than parsing the actual object.
 
-The string literal should be brought into scope with with `using namespace nlohmann::literals;`
+The string literal should be brought into scope with `using namespace nlohmann::literals;`
 (see [`json::parse()`](https://json.nlohmann.me/api/operator_literal_json/)).
 
 The above example can also be expressed explicitly using [`json::parse()`](https://json.nlohmann.me/api/basic_json/parse/):
@@ -318,7 +364,7 @@ std::cout << j_string << " == " << serialized_string << std::endl;
 
 Note the library only supports UTF-8. When you store strings with different encodings in the library, calling [`dump()`](https://json.nlohmann.me/api/basic_json/dump/) may throw an exception unless `json::error_handler_t::replace` or `json::error_handler_t::ignore` are used as error handlers.
 
-#### To/from streams (e.g. files, string streams)
+#### To/from streams (e.g., files, string streams)
 
 You can also use streams to serialize and deserialize:
 
@@ -351,7 +397,7 @@ Please note that setting the exception bit for `failbit` is inappropriate for th
 
 #### Read from iterator range
 
-You can also parse JSON from an iterator range; that is, from any container accessible by iterators whose `value_type` is an integral type of 1, 2 or 4 bytes, which will be interpreted as UTF-8, UTF-16 and UTF-32 respectively. For instance, a `std::vector<std::uint8_t>`, or a `std::list<std::uint16_t>`:
+You can also parse JSON from an iterator range; that is, from any container accessible by iterators whose `value_type` is an integral type of 1, 2, or 4 bytes, which will be interpreted as UTF-8, UTF-16, and UTF-32 respectively. For instance, a `std::vector<std::uint8_t>`, or a `std::list<std::uint16_t>`:
 
 ```cpp
 std::vector<std::uint8_t> v = {'t', 'r', 'u', 'e'};
@@ -383,7 +429,7 @@ struct MyIterator {
     using iterator_category = std::input_iterator_tag;
 
     MyIterator& operator++() {
-        MyContainer.advance();
+        target->advance();
         return *this;
     }
 
@@ -392,7 +438,7 @@ struct MyIterator {
     }
 
     reference operator*() const {
-        return target.get_current();
+        return target->get_current();
     }
 
     MyContainer* target = nullptr;
@@ -455,7 +501,7 @@ To implement your own SAX handler, proceed as follows:
 2. Create an object of your SAX interface class, e.g. `my_sax`.
 3. Call `bool json::sax_parse(input, &my_sax)`; where the first parameter can be any input like a string or an input stream and the second parameter is a pointer to your SAX interface.
 
-Note the `sax_parse` function only returns a `bool` indicating the result of the last executed SAX event. It does not return a  `json` value - it is up to you to decide what to do with the SAX events. Furthermore, no exceptions are thrown in case of a parse error - it is up to you what to do with the exception object passed to your `parse_error` implementation. Internally, the SAX interface is used for the DOM parser (class `json_sax_dom_parser`) as well as the acceptor (`json_sax_acceptor`), see file [`json_sax.hpp`](https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/input/json_sax.hpp).
+Note the `sax_parse` function only returns a `bool` indicating the result of the last executed SAX event. It does not return a  `json` value - it is up to you to decide what to do with the SAX events. Furthermore, no exceptions are thrown in case of a parse error -- it is up to you what to do with the exception object passed to your `parse_error` implementation. Internally, the SAX interface is used for the DOM parser (class `json_sax_dom_parser`) as well as the acceptor (`json_sax_acceptor`), see file [`json_sax.hpp`](https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/input/json_sax.hpp).
 
 ### STL-like access
 
@@ -545,7 +591,6 @@ int fob_present = o.count("fob"); // 0
 o.erase("foo");
 ```
 
-
 ### Conversion from STL containers
 
 Any sequence container (`std::array`, `std::vector`, `std::deque`, `std::forward_list`, `std::list`) whose values can be used to construct JSON values (e.g., integers, floating point numbers, Booleans, string types, or again STL containers described in this section) can be used to create a JSON array. The same holds for similar associative containers (`std::set`, `std::multiset`, `std::unordered_set`, `std::unordered_multiset`), but in these cases the order of the elements of the array depends on how the elements are ordered in the respective STL container.
@@ -588,7 +633,7 @@ json j_umset(c_umset); // both entries for "one" are used
 // maybe ["one", "two", "one", "four"]
 ```
 
-Likewise, any associative key-value containers (`std::map`, `std::multimap`, `std::unordered_map`, `std::unordered_multimap`) whose keys can construct an `std::string` and whose values can be used to construct JSON values (see examples above) can be used to create a JSON object. Note that in case of multimaps only one key is used in the JSON object and the value depends on the internal order of the STL container.
+Likewise, any associative key-value containers (`std::map`, `std::multimap`, `std::unordered_map`, `std::unordered_multimap`) whose keys can construct an `std::string` and whose values can be used to construct JSON values (see examples above) can be used to create a JSON object. Note that in case of multimaps, only one key is used in the JSON object and the value depends on the internal order of the STL container.
 
 ```cpp
 std::map<std::string, int> c_map { {"one", 1}, {"two", 2}, {"three", 3} };
@@ -610,7 +655,7 @@ json j_ummap(c_ummap); // only one entry for key "three" is used
 
 ### JSON Pointer and JSON Patch
 
-The library supports **JSON Pointer** ([RFC 6901](https://tools.ietf.org/html/rfc6901)) as alternative means to address structured values. On top of this, **JSON Patch** ([RFC 6902](https://tools.ietf.org/html/rfc6902)) allows describing differences between two JSON values - effectively allowing patch and diff operations known from Unix.
+The library supports **JSON Pointer** ([RFC 6901](https://tools.ietf.org/html/rfc6901)) as an alternative means to address structured values. On top of this, **JSON Patch** ([RFC 6902](https://tools.ietf.org/html/rfc6902)) allows describing differences between two JSON values -- effectively allowing patch and diff operations known from Unix.
 
 ```cpp
 // a JSON value
@@ -801,26 +846,21 @@ Likewise, when calling `get<your_type>()` or `get_to(your_type&)`, the `from_jso
 
 Some important things:
 
-* Those methods **MUST** be in your type's namespace (which can be the global namespace), or the library will not be able to locate them (in this example, they are in namespace `ns`, where `person` is defined).
-* Those methods **MUST** be available (e.g., proper headers must be included) everywhere you use these conversions. Look at [issue 1108](https://github.com/nlohmann/json/issues/1108) for errors that may occur otherwise.
-* When using `get<your_type>()`, `your_type` **MUST** be [DefaultConstructible](https://en.cppreference.com/w/cpp/named_req/DefaultConstructible). (There is a way to bypass this requirement described later.)
-* In function `from_json`, use function [`at()`](https://json.nlohmann.me/api/basic_json/at/) to access the object values rather than `operator[]`. In case a key does not exist, `at` throws an exception that you can handle, whereas `operator[]` exhibits undefined behavior.
-* You do not need to add serializers or deserializers for STL types like `std::vector`: the library already implements these.
+- Those methods **MUST** be in your type's namespace (which can be the global namespace), or the library will not be able to locate them (in this example, they are in namespace `ns`, where `person` is defined).
+- Those methods **MUST** be available (e.g., proper headers must be included) everywhere you use these conversions. Look at [issue 1108](https://github.com/nlohmann/json/issues/1108) for errors that may occur otherwise.
+- When using `get<your_type>()`, `your_type` **MUST** be [DefaultConstructible](https://en.cppreference.com/w/cpp/named_req/DefaultConstructible). (There is a way to bypass this requirement described later.)
+- In function `from_json`, use function [`at()`](https://json.nlohmann.me/api/basic_json/at/) to access the object values rather than `operator[]`. In case a key does not exist, `at` throws an exception that you can handle, whereas `operator[]` exhibits undefined behavior.
+- You do not need to add serializers or deserializers for STL types like `std::vector`: the library already implements these.
 
 #### Simplify your life with macros
 
-If you just want to serialize/deserialize some structs, the `to_json`/`from_json` functions can be a lot of boilerplate.
+If you just want to serialize/deserialize some structs, the `to_json`/`from_json` functions can be a lot of boilerplate. There are [**several macros**](https://json.nlohmann.me/features/arbitrary_types/#simplify-your-life-with-macros) to make your life easier as long as you (1) want to use a JSON object as serialization and (2) want to use the member variable names as object keys in that object.
 
-There are two macros to make your life easier as long as you (1) want to use a JSON object as serialization and (2) want to use the member variable names as object keys in that object:
+Which macro to choose depends on whether private member variables need to be accessed, a deserialization is needed, missing values should yield an error or should be replaced by default values, and if derived classes are used. See [this overview to choose the right one for your use case](https://json.nlohmann.me/api/macros/#serializationdeserialization-macros).
 
-- `NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(name, member1, member2, ...)` is to be defined inside the namespace of the class/struct to create code for.
-- `NLOHMANN_DEFINE_TYPE_INTRUSIVE(name, member1, member2, ...)` is to be defined inside the class/struct to create code for. This macro can also access private members.
+##### Example usage of macros
 
-In both macros, the first parameter is the name of the class/struct, and all remaining parameters name the members.
-
-##### Examples
-
-The `to_json`/`from_json` functions for the `person` struct above can be created with:
+The `to_json`/`from_json` functions for the `person` struct above can be created with [`NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE`](https://json.nlohmann.me/api/macros/nlohmann_define_type_non_intrusive/). In all macros, the first parameter is the name of the class/struct, and all remaining parameters name the members.
 
 ```cpp
 namespace ns {
@@ -828,7 +868,7 @@ namespace ns {
 }
 ```
 
-Here is an example with private members, where `NLOHMANN_DEFINE_TYPE_INTRUSIVE` is needed:
+Here is another example with private members, where [`NLOHMANN_DEFINE_TYPE_INTRUSIVE`](https://json.nlohmann.me/api/macros/nlohmann_define_type_intrusive/) is needed:
 
 ```cpp
 namespace ns {
@@ -837,7 +877,7 @@ namespace ns {
         std::string street;
         int housenumber;
         int postcode;
-
+  
       public:
         NLOHMANN_DEFINE_TYPE_INTRUSIVE(address, street, housenumber, postcode)
     };
@@ -848,7 +888,7 @@ namespace ns {
 
 This requires a bit more advanced technique. But first, let's see how this conversion mechanism works:
 
-The library uses **JSON Serializers** to convert types to json.
+The library uses **JSON Serializers** to convert types to JSON.
 The default serializer for `nlohmann::json` is `nlohmann::adl_serializer` (ADL means [Argument-Dependent Lookup](https://en.cppreference.com/w/cpp/language/adl)).
 
 It is implemented like this (simplified):
@@ -898,7 +938,7 @@ namespace nlohmann {
 
 #### How can I use `get()` for non-default constructible/non-copyable types?
 
-There is a way, if your type is [MoveConstructible](https://en.cppreference.com/w/cpp/named_req/MoveConstructible). You will need to specialize the `adl_serializer` as well, but with a special `from_json` overload:
+There is a way if your type is [MoveConstructible](https://en.cppreference.com/w/cpp/named_req/MoveConstructible). You will need to specialize the `adl_serializer` as well, but with a special `from_json` overload:
 
 ```cpp
 struct move_only_type {
@@ -971,23 +1011,23 @@ struct bad_serializer
 {
     template <typename BasicJsonType>
     static void to_json(BasicJsonType& j, const T& value) {
-      // this calls BasicJsonType::json_serializer<T>::to_json(j, value);
+      // this calls BasicJsonType::json_serializer<T>::to_json(j, value)
       // if BasicJsonType::json_serializer == bad_serializer ... oops!
       j = value;
     }
 
     template <typename BasicJsonType>
     static void to_json(const BasicJsonType& j, T& value) {
-      // this calls BasicJsonType::json_serializer<T>::from_json(j, value);
+      // this calls BasicJsonType::json_serializer<T>::from_json(j, value)
       // if BasicJsonType::json_serializer == bad_serializer ... oops!
-      value = j.template get<T>(); // oops!
+      value = j.get<T>(); // oops!
     }
 };
 ```
 
 ### Specializing enum conversion
 
-By default, enum values are serialized to JSON as integers. In some cases this could result in undesired behavior. If an enum is modified or re-ordered after data has been serialized to JSON, the later de-serialized JSON data may be undefined or a different enum value than was originally intended.
+By default, enum values are serialized to JSON as integers. In some cases, this could result in undesired behavior. If an enum is modified or re-ordered after data has been serialized to JSON, the later deserialized JSON data may be undefined or a different enum value than was originally intended.
 
 It is possible to more precisely specify how a given enum is mapped to and from JSON as shown below:
 
@@ -1024,14 +1064,16 @@ assert(j3.get<TaskState>() == TS_RUNNING);
 
 // undefined json value to enum (where the first map entry above is the default)
 json jPi = 3.14;
-assert(jPi.get<TaskState>() == TS_INVALID );
+assert(jPi.get<TaskState>() == TS_INVALID);
 ```
 
 Just as in [Arbitrary Type Conversions](#arbitrary-types-conversions) above,
+
 - `NLOHMANN_JSON_SERIALIZE_ENUM()` MUST be declared in your enum type's namespace (which can be the global namespace), or the library will not be able to locate it, and it will default to integer serialization.
 - It MUST be available (e.g., proper headers must be included) everywhere you use the conversions.
 
 Other Important points:
+
 - When using `get<ENUM_TYPE>()`, undefined JSON values will default to the first pair specified in your map. Select this default pair carefully.
 - If an enum or JSON value is specified more than once in your map, the first matching occurrence from the top of the map will be returned when converting to or from JSON.
 
@@ -1106,14 +1148,19 @@ binary.set_subtype(0x10);
 auto cbor = json::to_msgpack(j); // 0xD5 (fixext2), 0x10, 0xCA, 0xFE
 ```
 
+## Customers
+
+The library is used in multiple projects, applications, operating systems, etc. The list below is not exhaustive, but the result of an internet search. If you know further customers of the library, please let me know, see [contact](#contact).
+
+[![logos of customers using the library](docs/mkdocs/docs/images/customers.png)](https://json.nlohmann.me/home/customers/)
 
 ## Supported compilers
 
-Though it's 2022 already, the support for C++11 is still a bit sparse. Currently, the following compilers are known to work:
+Though it's 2026 already, the support for C++11 is still a bit sparse. Currently, the following compilers are known to work:
 
-- GCC 4.8 - 12.0 (and possibly later)
-- Clang 3.4 - 15.0 (and possibly later)
-- Apple Clang 9.1 - 13.1 (and possibly later)
+- GCC 4.8 - 14.2 (and possibly later)
+- Clang 3.4 - 21.0 (and possibly later)
+- Apple Clang 9.1 - 16.0 (and possibly later)
 - Intel C++ Compiler 17.0.2 (and possibly later)
 - Nvidia CUDA Compiler 11.0.221 (and possibly later)
 - Microsoft Visual C++ 2015 / Build Tools 14.0.25123.0 (and possibly later)
@@ -1125,10 +1172,10 @@ I would be happy to learn about other compilers/versions.
 
 Please note:
 
-- GCC 4.8 has a bug [57824](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57824)): multiline raw strings cannot be the arguments to macros. Don't use multiline raw strings directly in macros with this compiler.
+- GCC 4.8 has a bug [57824](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57824): multiline raw strings cannot be the arguments to macros. Don't use multiline raw strings directly in macros with this compiler.
 - Android defaults to using very old compilers and C++ libraries. To fix this, add the following to your `Application.mk`. This will switch to the LLVM C++ library, the Clang compiler, and enable C++11 and other features disabled by default.
 
-    ```
+    ```makefile
     APP_STL := c++_shared
     NDK_TOOLCHAIN_VERSION := clang3.6
     APP_CPPFLAGS += -frtti -fexceptions
@@ -1136,63 +1183,11 @@ Please note:
 
     The code compiles successfully with [Android NDK](https://developer.android.com/ndk/index.html?hl=ml), Revision 9 - 11 (and possibly later) and [CrystaX's Android NDK](https://www.crystax.net/en/android/ndk) version 10.
 
-- For GCC running on MinGW or Android SDK, the error `'to_string' is not a member of 'std'` (or similarly, for `strtod` or `strtof`) may occur. Note this is not an issue with the code,  but rather with the compiler itself. On Android, see above to build with a newer environment.  For MinGW, please refer to [this site](https://tehsausage.com/mingw-to-string) and [this discussion](https://github.com/nlohmann/json/issues/136) for information on how to fix this bug. For Android NDK using `APP_STL := gnustl_static`, please refer to [this discussion](https://github.com/nlohmann/json/issues/219).
+- For GCC running on MinGW or Android SDK, the error `'to_string' is not a member of 'std'` (or similarly, for `strtod` or `strtof`) may occur. Note this is not an issue with the code, but rather with the compiler itself. On Android, see above to build with a newer environment.  For MinGW, please refer to [this site](https://tehsausage.com/mingw-to-string) and [this discussion](https://github.com/nlohmann/json/issues/136) for information on how to fix this bug. For Android NDK using `APP_STL := gnustl_static`, please refer to [this discussion](https://github.com/nlohmann/json/issues/219).
 
 - Unsupported versions of GCC and Clang are rejected by `#error` directives. This can be switched off by defining `JSON_SKIP_UNSUPPORTED_COMPILER_CHECK`. Note that you can expect no support in this case.
 
-The following compilers are currently used in continuous integration at [AppVeyor](https://ci.appveyor.com/project/nlohmann/json), [Drone CI](https://cloud.drone.io/nlohmann/json), and [GitHub Actions](https://github.com/nlohmann/json/actions):
-
-| Compiler                                                                                               | Operating System   | CI Provider    |
-|--------------------------------------------------------------------------------------------------------|--------------------|----------------|
-| Apple Clang 11.0.3 (clang-1103.0.32.62);  Xcode 11.7                                                   | macOS 11.6.8       | GitHub Actions |
-| Apple Clang 12.0.0 (clang-1200.0.32.29);  Xcode 12.4                                                   | macOS 11.6.8       | GitHub Actions |
-| Apple Clang 12.0.5 (clang-1205.0.22.11);  Xcode 12.5.1                                                 | macOS 11.6.8       | GitHub Actions |
-| Apple Clang 13.0.0 (clang-1300.0.29.3);   Xcode 13.0                                                   | macOS 11.6.8       | GitHub Actions |
-| Apple Clang 13.0.0 (clang-1300.0.29.3);   Xcode 13.1                                                   | macOS 12.4         | GitHub Actions |
-| Apple Clang 13.0.0 (clang-1300.0.29.30);  Xcode 13.2.1                                                 | macOS 12.4         | GitHub Actions |
-| Apple Clang 13.1.6 (clang-1316.0.21.2.3); Xcode 13.3.1                                                 | macOS 12.4         | GitHub Actions |
-| Apple Clang 13.1.6 (clang-1316.0.21.2.5); Xcode 13.4.1                                                 | macOS 12.4         | GitHub Actions |
-| Clang 3.5.2 (3.5.2-3ubuntu1)                                                                           | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 3.6.2 (3.6.2-3ubuntu2)                                                                           | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 3.7.1 (3.7.1-2ubuntu2)                                                                           | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 3.8.0 (3.8.0-2ubuntu4)                                                                           | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 3.9.1 (3.9.1-4ubuntu3\~16.04.2)                                                                  | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 4.0.0 (4.0.0-1ubuntu1\~16.04.2)                                                                  | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 5.0.0 (5.0.0-3\~16.04.1)                                                                         | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 6.0.1 (6.0.1-14)                                                                                 | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 7.0.1 (7.0.1-12)                                                                                 | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 8.0.1 (8.0.1-9)                                                                                  | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 9.0.1 (9.0.1-12)                                                                                 | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 10.0.0 (10.0.0-4ubuntu1)                                                                         | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 10.0.0 with GNU-like command-line                                                                | Windows-10.0.17763 | GitHub Actions |
-| Clang 11.0.0 with GNU-like command-line                                                                | Windows-10.0.17763 | GitHub Actions |
-| Clang 11.0.0 with MSVC-like command-line                                                               | Windows-10.0.17763 | GitHub Actions |
-| Clang 11.0.0 (11.0.0-2~ubuntu20.04.1)                                                                  | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 12.0.0 (12.0.0-3ubuntu1~20.04.3)                                                                 | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 13.0.1 (13.0.1-++20211015123032+cf15ccdeb6d5-1exp120211015003613.5)                              | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 14.0.5-++20220603124341+2f0a69c32a4c-1~exp1~20220603124352.149                                   | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Clang 15.0.0 (15.0.0-++20220530052901+b7d2b160c3ba-1~exp1~20220530172952.268)                          | Ubuntu 20.04.3 LTS | GitHub Actions |
-| GCC 4.8.5 (Ubuntu 4.8.5-4ubuntu2)                                                                      | Ubuntu 20.04.3 LTS | GitHub Actions |
-| GCC 4.9.3 (Ubuntu 4.9.3-13ubuntu2)                                                                     | Ubuntu 20.04.3 LTS | GitHub Actions |
-| GCC 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12)                                                             | Ubuntu 20.04.3 LTS | GitHub Actions |
-| GCC 6.4.0 (Ubuntu 6.4.0-17ubuntu1)                                                                     | Ubuntu 20.04.3 LTS | GitHub Actions |
-| GCC 7.5.0 (Ubuntu 7.5.0-6ubuntu2)                                                                      | Ubuntu 20.04.3 LTS | GitHub Actions |
-| GCC 8.1.0 (i686-posix-dwarf-rev0, Built by MinGW-W64 project)                                          | Windows-10.0.17763 | GitHub Actions |
-| GCC 8.1.0 (x86_64-posix-seh-rev0, Built by MinGW-W64 project)                                          | Windows-10.0.17763 | GitHub Actions |
-| GCC 8.4.0 (Ubuntu 8.4.0-3ubuntu2)                                                                      | Ubuntu 20.04.3 LTS | GitHub Actions |
-| GCC 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)                                                               | Ubuntu 20.04.3 LTS | GitHub Actions |
-| GCC 10.2.0 (Ubuntu 10.2.0-5ubuntu1~20.04)                                                              | Ubuntu 20.04.3 LTS | GitHub Actions |
-| GCC 11.1.0                                                                                             | Ubuntu (aarch64)   | Drone CI       |
-| GCC 11.1.0 (Ubuntu 11.1.0-1ubuntu1~20.04)                                                              | Ubuntu 20.04.3 LTS | GitHub Actions |
-| GCC 13.0.0 13.0.0 20220605 (experimental)                                                              | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Intel C++ Compiler 2021.5.0.20211109                                                                   | Ubuntu 20.04.3 LTS | GitHub Actions |
-| NVCC 11.0.221                                                                                          | Ubuntu 20.04.3 LTS | GitHub Actions |
-| Visual Studio 14 2015 MSVC 19.0.24241.7 (Build Engine version 14.0.25420.1)                            | Windows-6.3.9600   | AppVeyor       |
-| Visual Studio 15 2017 MSVC 19.16.27035.0 (Build Engine version 15.9.21+g9802d43bc3 for .NET Framework) | Windows-10.0.14393 | AppVeyor       |
-| Visual Studio 16 2019 MSVC 19.28.29912.0 (Build Engine version 16.9.0+57a23d249 for .NET Framework)    | Windows-10.0.17763 | GitHub Actions |
-| Visual Studio 16 2019 MSVC 19.28.29912.0 (Build Engine version 16.9.0+57a23d249 for .NET Framework)    | Windows-10.0.17763 | AppVeyor       |
-| Visual Studio 17 2022 MSVC 19.30.30709.0 (Build Engine version 17.0.31804.368 for .NET Framework)      | Windows-10.0.20348 | GitHub Actions |
-
+See the page [quality assurance](https://json.nlohmann.me/community/quality_assurance) on the compilers used to check the library in the CI.
 
 ## Integration
 
@@ -1207,7 +1202,7 @@ using json = nlohmann::json;
 
 to the files you want to process JSON and set the necessary switches to enable C++11 (e.g., `-std=c++11` for GCC and Clang).
 
-You can further use file [`include/nlohmann/json_fwd.hpp`](https://github.com/nlohmann/json/blob/develop/include/nlohmann/json_fwd.hpp) for forward-declarations. The installation of json_fwd.hpp (as part of cmake's install step), can be achieved by setting `-DJSON_MultipleHeaders=ON`.
+You can further use file [`include/nlohmann/json_fwd.hpp`](https://github.com/nlohmann/json/blob/develop/include/nlohmann/json_fwd.hpp) for forward-declarations. The installation of `json_fwd.hpp` (as part of cmake's install step) can be achieved by setting `-DJSON_MultipleHeaders=ON`.
 
 ### CMake
 
@@ -1219,7 +1214,7 @@ To use this library from a CMake project, you can locate it directly with `find_
 
 ```cmake
 # CMakeLists.txt
-find_package(nlohmann_json 3.2.0 REQUIRED)
+find_package(nlohmann_json 3.12.0 REQUIRED)
 ...
 add_library(foo ...)
 ...
@@ -1259,16 +1254,17 @@ Since CMake v3.11,
 be used to automatically download a release as a dependency at configure time.
 
 Example:
+
 ```cmake
 include(FetchContent)
 
-FetchContent_Declare(json URL https://github.com/nlohmann/json/releases/download/v3.11.2/json.tar.xz)
+FetchContent_Declare(json URL https://github.com/nlohmann/json/releases/download/v3.12.0/json.tar.xz)
 FetchContent_MakeAvailable(json)
 
 target_link_libraries(foo PRIVATE nlohmann_json::nlohmann_json)
 ```
 
-**Note**: It is recommended to use the URL approach described above which is supported as of version 3.10.0. See
+**Note**: It is recommended to use the URL approach described above, which is supported as of version 3.10.0. See
 <https://json.nlohmann.me/integration/cmake/#fetchcontent> for more information.
 
 #### Supporting Both
@@ -1289,11 +1285,12 @@ add_library(foo ...)
 # import method
 target_link_libraries(foo PRIVATE nlohmann_json::nlohmann_json)
 ```
+
 ```cmake
 # thirdparty/CMakeLists.txt
 ...
 if(FOO_USE_EXTERNAL_JSON)
-  find_package(nlohmann_json 3.2.0 REQUIRED)
+  find_package(nlohmann_json 3.12.0 REQUIRED)
 else()
   set(JSON_BuildTests OFF CACHE INTERNAL "")
   add_subdirectory(nlohmann_json)
@@ -1305,47 +1302,24 @@ endif()
 
 ### Package Managers
 
-:beer: If you are using OS X and [Homebrew](https://brew.sh), just type `brew install nlohmann-json` and you're set. If you want the bleeding edge rather than the latest release, use `brew install nlohmann-json --HEAD`. See [nlohmann-json](https://formulae.brew.sh/formula/nlohmann-json) for more information.
+Use your favorite [**package manager**](https://json.nlohmann.me/integration/package_managers/) to use the library.
 
-If you are using the [Meson Build System](https://mesonbuild.com), add this source tree as a [meson subproject](https://mesonbuild.com/Subprojects.html#using-a-subproject). You may also use the `include.zip` published in this project's [Releases](https://github.com/nlohmann/json/releases) to reduce the size of the vendored source tree. Alternatively, you can get a wrap file by downloading it from [Meson WrapDB](https://wrapdb.mesonbuild.com/nlohmann_json), or simply use `meson wrap install nlohmann_json`. Please see the meson project for any issues regarding the packaging.
+- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/homebrew.svg" height="20">&nbsp;[**Homebrew**](https://json.nlohmann.me/integration/package_managers/#homebrew) `nlohmann-json`
+- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/meson.svg" height="20">&nbsp;[**Meson**](https://json.nlohmann.me/integration/package_managers/#meson) `nlohmann_json`
+- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/bazel.svg" height="20">&nbsp;[**Bazel**](https://json.nlohmann.me/integration/package_managers/#bazel) `nlohmann_json`
+- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/conan.svg" height="20">&nbsp;[**Conan**](https://json.nlohmann.me/integration/package_managers/#conan) `nlohmann_json`
+- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/spack.svg" height="20">&nbsp;[**Spack**](https://json.nlohmann.me/integration/package_managers/#spack) `nlohmann-json`
+- [**Hunter**](https://json.nlohmann.me/integration/package_managers/#hunter) `nlohmann_json`
+- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/vcpkg.png" height="20">&nbsp;[**vcpkg**](https://json.nlohmann.me/integration/package_managers/#vcpkg) `nlohmann-json`
+- [**cget**](https://json.nlohmann.me/integration/package_managers/#cget) `nlohmann/json`
+- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/swift.svg" height="20">&nbsp;[**Swift Package Manager**](https://json.nlohmann.me/integration/package_managers/#swift-package-manager) `nlohmann/json`
+- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/nuget.svg" height="20">&nbsp;[**Nuget**](https://json.nlohmann.me/integration/package_managers/#nuget) `nlohmann.json`
+- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/conda.svg" height="20">&nbsp;[**Conda**](https://json.nlohmann.me/integration/package_managers/#conda) `nlohmann_json`
+- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/macports.svg" height="20">&nbsp;[**MacPorts**](https://json.nlohmann.me/integration/package_managers/#macports) `nlohmann-json`
+- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/CPM.png" height="20">&nbsp;[**cpm.cmake**](https://json.nlohmann.me/integration/package_managers/#cpmcmake) `gh:nlohmann/json`
+- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/xmake.svg" height="20">&nbsp;[**xmake**](https://json.nlohmann.me/integration/package_managers/#xmake) `nlohmann_json`
 
-The provided `meson.build` can also be used as an alternative to cmake for installing `nlohmann_json` system-wide in which case a pkg-config file is installed. To use it, simply have your build system require the `nlohmann_json` pkg-config dependency. In Meson, it is preferred to use the [`dependency()`](https://mesonbuild.com/Reference-manual.html#dependency) object with a subproject fallback, rather than using the subproject directly.
-
-If you are using [Conan](https://www.conan.io/) to manage your dependencies, merely add [`nlohmann_json/x.y.z`](https://conan.io/center/nlohmann_json) to your `conanfile`'s requires, where `x.y.z` is the release version you want to use. Please file issues [here](https://github.com/conan-io/conan-center-index/issues) if you experience problems with the packages.
-
-If you are using [Spack](https://www.spack.io/) to manage your dependencies, you can use the [`nlohmann-json` package](https://spack.readthedocs.io/en/latest/package_list.html#nlohmann-json). Please see the [spack project](https://github.com/spack/spack) for any issues regarding the packaging.
-
-If you are using [hunter](https://github.com/cpp-pm/hunter) on your project for external dependencies, then you can use the [nlohmann_json package](https://hunter.readthedocs.io/en/latest/packages/pkg/nlohmann_json.html). Please see the hunter project for any issues regarding the packaging.
-
-If you are using [Buckaroo](https://buckaroo.pm), you can install this library's module with `buckaroo add github.com/buckaroo-pm/nlohmann-json`. Please file issues [here](https://github.com/buckaroo-pm/nlohmann-json). There is a demo repo [here](https://github.com/njlr/buckaroo-nholmann-json-example).
-
-If you are using [vcpkg](https://github.com/Microsoft/vcpkg/) on your project for external dependencies, then you can install the [nlohmann-json package](https://github.com/Microsoft/vcpkg/tree/master/ports/nlohmann-json) with `vcpkg install nlohmann-json` and follow the then displayed descriptions. Please see the vcpkg project for any issues regarding the packaging.
-
-If you are using [cget](https://cget.readthedocs.io/en/latest/), you can install the latest development version with `cget install nlohmann/json`. A specific version can be installed with `cget install nlohmann/json@v3.1.0`. Also, the multiple header version can be installed by adding the `-DJSON_MultipleHeaders=ON` flag (i.e., `cget install nlohmann/json -DJSON_MultipleHeaders=ON`).
-
-If you are using [CocoaPods](https://cocoapods.org), you can use the library by adding pod `"nlohmann_json", '~>3.1.2'` to your podfile (see [an example](https://bitbucket.org/benman/nlohmann_json-cocoapod/src/master/)). Please file issues [here](https://bitbucket.org/benman/nlohmann_json-cocoapod/issues?status=new&status=open).
-
-If you are using [NuGet](https://www.nuget.org), you can use the package [nlohmann.json](https://www.nuget.org/packages/nlohmann.json/). Please check [this extensive description](https://github.com/nlohmann/json/issues/1132#issuecomment-452250255) on how to use the package. Please file issues [here](https://github.com/hnkb/nlohmann-json-nuget/issues).
-
-If you are using [conda](https://conda.io/), you can use the package [nlohmann_json](https://github.com/conda-forge/nlohmann_json-feedstock) from [conda-forge](https://conda-forge.org) executing `conda install -c conda-forge nlohmann_json`. Please file issues [here](https://github.com/conda-forge/nlohmann_json-feedstock/issues).
-
-If you are using [MSYS2](https://www.msys2.org/), you can use the [mingw-w64-nlohmann-json](https://packages.msys2.org/base/mingw-w64-nlohmann-json) package, just type `pacman -S mingw-w64-i686-nlohmann-json` or `pacman -S mingw-w64-x86_64-nlohmann-json` for installation. Please file issues [here](https://github.com/msys2/MINGW-packages/issues/new?title=%5Bnlohmann-json%5D) if you experience problems with the packages.
-
-If you are using [MacPorts](https://ports.macports.org), execute `sudo port install nlohmann-json` to install the [nlohmann-json](https://ports.macports.org/port/nlohmann-json/) package.
-
-If you are using [`build2`](https://build2.org), you can use the [`nlohmann-json`](https://cppget.org/nlohmann-json) package from the public repository https://cppget.org or directly from the [package's sources repository](https://github.com/build2-packaging/nlohmann-json). In your project's `manifest` file, just add `depends: nlohmann-json` (probably with some [version constraints](https://build2.org/build2-toolchain/doc/build2-toolchain-intro.xhtml#guide-add-remove-deps)). If you are not familiar with using dependencies in `build2`, [please read this introduction](https://build2.org/build2-toolchain/doc/build2-toolchain-intro.xhtml).
-Please file issues [here](https://github.com/build2-packaging/nlohmann-json) if you experience problems with the packages.
-
-If you are using [`wsjcpp`](https://wsjcpp.org), you can use the command `wsjcpp install "https://github.com/nlohmann/json:develop"` to get the latest version. Note you can change the branch ":develop" to an existing tag or another branch.
-
-If you are using [`CPM.cmake`](https://github.com/TheLartians/CPM.cmake), you can check this [`example`](https://github.com/TheLartians/CPM.cmake/tree/master/examples/json). After [adding CPM script](https://github.com/TheLartians/CPM.cmake#adding-cpm) to your project, implement the following snippet to your CMake:
-
-```cmake
-CPMAddPackage(
-    NAME nlohmann_json
-    GITHUB_REPOSITORY nlohmann/json
-    VERSION 3.9.1)
-```
+The library is part of many package managers. See the [**documentation**](https://json.nlohmann.me/integration/package_managers/) for detailed descriptions and examples.
 
 ### Pkg-config
 
@@ -1355,20 +1329,13 @@ If you are using bare Makefiles, you can use `pkg-config` to generate the includ
 pkg-config nlohmann_json --cflags
 ```
 
-Users of the Meson build system will also be able to use a system-wide library, which will be found by `pkg-config`:
-
-```meson
-json = dependency('nlohmann_json', required: true)
-```
-
-
 ## License
 
-<img align="right" src="https://opensource.org/trademarks/opensource/OSI-Approved-License-100x137.png">
+<img align="right" src="https://149753425.v2.pressablecdn.com/wp-content/uploads/2009/06/OSIApproved_100X125.png" alt="OSI approved license">
 
 The class is licensed under the [MIT License](https://opensource.org/licenses/MIT):
 
-Copyright &copy; 2013-2022 [Niels Lohmann](https://nlohmann.me)
+Copyright &copy; 2013-2026 [Niels Lohmann](https://nlohmann.me)
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 
@@ -1378,13 +1345,19 @@ THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR I
 
 * * *
 
-The class contains the UTF-8 Decoder from Bjoern Hoehrmann which is licensed under the [MIT License](https://opensource.org/licenses/MIT) (see above). Copyright &copy; 2008-2009 [Björn Hoehrmann](https://bjoern.hoehrmann.de/) <bjoern@hoehrmann.de>
+- The class contains the UTF-8 Decoder from Bjoern Hoehrmann which is licensed under the [MIT License](https://opensource.org/licenses/MIT) (see above). Copyright &copy; 2008-2009 [Björn Hoehrmann](https://bjoern.hoehrmann.de/) <bjoern@hoehrmann.de>
+- The class contains a slightly modified version of the Grisu2 algorithm from Florian Loitsch which is licensed under the [MIT License](https://opensource.org/licenses/MIT) (see above). Copyright &copy; 2009 [Florian Loitsch](https://florian.loitsch.com/)
+- The class contains a copy of [Hedley](https://nemequ.github.io/hedley/) from Evan Nemerson which is licensed as [CC0-1.0](https://creativecommons.org/publicdomain/zero/1.0/).
+- The class contains parts of [Google Abseil](https://github.com/abseil/abseil-cpp) which is licensed under the [Apache 2.0 License](https://opensource.org/licenses/Apache-2.0).
 
-The class contains a slightly modified version of the Grisu2 algorithm from Florian Loitsch which is licensed under the [MIT License](https://opensource.org/licenses/MIT) (see above). Copyright &copy; 2009 [Florian Loitsch](https://florian.loitsch.com/)
+<img align="right" src="https://git.fsfe.org/reuse/reuse-ci/raw/branch/master/reuse-horizontal.png" alt="REUSE Software">
 
-The class contains a copy of [Hedley](https://nemequ.github.io/hedley/) from Evan Nemerson which is licensed as [CC0-1.0](https://creativecommons.org/publicdomain/zero/1.0/).
+The library is compliant to version 3.3 of the [**REUSE specification**](https://reuse.software):
 
-The class contains parts of [Google Abseil](https://github.com/abseil/abseil-cpp) which is licensed under the [Apache 2.0 License](https://opensource.org/licenses/Apache-2.0).
+- Every source file contains an SPDX copyright header.
+- The full text of all licenses used in the repository can be found in the `LICENSES` folder.
+- File `.reuse/dep5` contains an overview of all files' copyrights and licenses.
+- Run `pipx run reuse lint` to verify the project's REUSE compliance and `pipx run reuse spdx` to generate a SPDX SBOM.
 
 ## Contact
 
@@ -1400,7 +1373,7 @@ Only if your request would contain confidential information, please [send me an
 
 I deeply appreciate the help of the following people.
 
-<img src="https://raw.githubusercontent.com/nlohmann/json/develop/docs/avatars.png" align="right">
+<img src="https://raw.githubusercontent.com/nlohmann/json/develop/docs/avatars.png" align="right" alt="GitHub avatars of the contributors">
 
 1. [Teemperor](https://github.com/Teemperor) implemented CMake support and lcov integration, realized escape and Unicode handling in the string parser, and fixed the JSON serialization.
 2. [elliotgoodrich](https://github.com/elliotgoodrich) fixed an issue with double deletion in the iterator classes.
@@ -1413,13 +1386,13 @@ I deeply appreciate the help of the following people.
 9. [Florian Weber](https://github.com/Florianjw) fixed a bug in and improved the performance of the comparison operators.
 10. [Eric Cornelius](https://github.com/EricMCornelius) pointed out a bug in the handling with NaN and infinity values. He also improved the performance of the string escaping.
 11. [易思龙](https://github.com/likebeta) implemented a conversion from anonymous enums.
-12. [kepkin](https://github.com/kepkin) patiently pushed forward the support for Microsoft Visual studio.
+12. [kepkin](https://github.com/kepkin) patiently pushed forward the support for Microsoft Visual Studio.
 13. [gregmarr](https://github.com/gregmarr) simplified the implementation of reverse iterators and helped with numerous hints and improvements. In particular, he pushed forward the implementation of user-defined types.
 14. [Caio Luppi](https://github.com/caiovlp) fixed a bug in the Unicode handling.
 15. [dariomt](https://github.com/dariomt) fixed some typos in the examples.
 16. [Daniel Frey](https://github.com/d-frey) cleaned up some pointers and implemented exception-safe memory allocation.
 17. [Colin Hirsch](https://github.com/ColinH) took care of a small namespace issue.
-18. [Huu Nguyen](https://github.com/whoshuu) correct a variable name in the documentation.
+18. [Huu Nguyen](https://github.com/whoshuu) corrected a variable name in the documentation.
 19. [Silverweed](https://github.com/silverweed) overloaded `parse()` to accept an rvalue reference.
 20. [dariomt](https://github.com/dariomt) fixed a subtlety in MSVC type support and implemented the `get_ref()` function to get a reference to stored values.
 21. [ZahlGraf](https://github.com/ZahlGraf) added a workaround that allows compilation using Android NDK.
@@ -1454,7 +1427,7 @@ I deeply appreciate the help of the following people.
 50. [Jared Grubb](https://github.com/jaredgrubb) silenced a nasty documentation warning.
 51. [Yixin Zhang](https://github.com/qwename) fixed an integer overflow check.
 52. [Bosswestfalen](https://github.com/Bosswestfalen) merged two iterator classes into a smaller one.
-53. [Daniel599](https://github.com/Daniel599) helped to get Travis execute the tests with Clang's sanitizers.
+53. [Daniel599](https://github.com/Daniel599) helped to get Travis to execute the tests with Clang's sanitizers.
 54. [Jonathan Lee](https://github.com/vjon) fixed an example in the README file.
 55. [gnzlbg](https://github.com/gnzlbg) supported the implementation of user-defined types.
 56. [Alexej Harm](https://github.com/qis) helped to get the user-defined types working with Visual Studio.
@@ -1475,7 +1448,7 @@ I deeply appreciate the help of the following people.
 71. [Vincent Thiery](https://github.com/vthiery) maintains a package for the Conan package manager.
 72. [Steffen](https://github.com/koemeet) fixed a potential issue with MSVC and `std::min`.
 73. [Mike Tzou](https://github.com/Chocobo1) fixed some typos.
-74. [amrcode](https://github.com/amrcode) noted a misleading documentation about comparison of floats.
+74. [amrcode](https://github.com/amrcode) noted misleading documentation about comparison of floats.
 75. [Oleg Endo](https://github.com/olegendo) reduced the memory consumption by replacing `<iostream>` with `<iosfwd>`.
 76. [dan-42](https://github.com/dan-42) cleaned up the CMake files to simplify including/reusing of the library.
 77. [Nikita Ofitserov](https://github.com/himikof) allowed for moving values from initializer lists.
@@ -1502,13 +1475,13 @@ I deeply appreciate the help of the following people.
 98. [Vadim Evard](https://github.com/Pipeliner) fixed a Markdown issue in the README.
 99. [zerodefect](https://github.com/zerodefect) fixed a compiler warning.
 100. [Kert](https://github.com/kaidokert) allowed to template the string type in the serialization and added the possibility to override the exceptional behavior.
-101. [mark-99](https://github.com/mark-99) helped fixing an ICC error.
+101. [mark-99](https://github.com/mark-99) helped fix an ICC error.
 102. [Patrik Huber](https://github.com/patrikhuber) fixed links in the README file.
 103. [johnfb](https://github.com/johnfb) found a bug in the implementation of CBOR's indefinite length strings.
 104. [Paul Fultz II](https://github.com/pfultz2) added a note on the cget package manager.
 105. [Wilson Lin](https://github.com/wla80) made the integration section of the README more concise.
 106. [RalfBielig](https://github.com/ralfbielig) detected and fixed a memory leak in the parser callback.
-107. [agrianius](https://github.com/agrianius) allowed to dump JSON to an alternative string type.
+107. [agrianius](https://github.com/agrianius) allowed dumping JSON to an alternative string type.
 108. [Kevin Tonon](https://github.com/ktonon) overworked the C++11 compiler checks in CMake.
 109. [Axel Huebl](https://github.com/ax3l) simplified a CMake check and added support for the [Spack package manager](https://spack.io).
 110. [Carlos O'Ryan](https://github.com/coryan) fixed a typo.
@@ -1519,7 +1492,7 @@ I deeply appreciate the help of the following people.
 115. [Matthias Möller](https://github.com/TinyTinni) removed the dependency from `std::stringstream`.
 116. [agrianius](https://github.com/agrianius) added code to use alternative string implementations.
 117. [Daniel599](https://github.com/Daniel599) allowed to use more algorithms with the `items()` function.
-118. [Julius Rakow](https://github.com/jrakow) fixed the Meson include directory and fixed the links to [cppreference.com](cppreference.com).
+118. [Julius Rakow](https://github.com/jrakow) fixed the Meson include directory and fixed the links to [cppreference.com](https://cppreference.com).
 119. [Sonu Lohani](https://github.com/sonulohani) fixed the compilation with MSVC 2015 in debug mode.
 120. [grembo](https://github.com/grembo) fixed the test suite and re-enabled several test cases.
 121. [Hyeon Kim](https://github.com/simnalamburt) introduced the macro `JSON_INTERNAL_CATCH` to control the exception handling inside the library.
@@ -1557,12 +1530,12 @@ I deeply appreciate the help of the following people.
 153. [Ivor Wanders](https://github.com/iwanders) helped to reduce the CMake requirement to version 3.1.
 154. [njlr](https://github.com/njlr) updated the Buckaroo instructions.
 155. [Lion](https://github.com/lieff) fixed a compilation issue with GCC 7 on CentOS.
-156. [Isaac Nickaein](https://github.com/nickaein) improved the integer serialization performance and  implemented the `contains()` function.
+156. [Isaac Nickaein](https://github.com/nickaein) improved the integer serialization performance and implemented the `contains()` function.
 157. [past-due](https://github.com/past-due) suppressed an unfixable warning.
 158. [Elvis Oric](https://github.com/elvisoric) improved Meson support.
 159. [Matěj Plch](https://github.com/Afforix) fixed an example in the README.
 160. [Mark Beckwith](https://github.com/wythe) fixed a typo.
-161. [scinart](https://github.com/scinart) fixed bug in the serializer.
+161. [scinart](https://github.com/scinart) fixed a bug in the serializer.
 162. [Patrick Boettcher](https://github.com/pboettch) implemented `push_back()` and `pop_back()` for JSON Pointers.
 163. [Bruno Oliveira](https://github.com/nicoddemus) added support for Conda.
 164. [Michele Caini](https://github.com/skypjack) fixed links in the README.
@@ -1604,7 +1577,7 @@ I deeply appreciate the help of the following people.
 200. [Alexander “weej” Jones](https://github.com/alex-weej) fixed an example in the README.
 201. [Antoine Cœur](https://github.com/Coeur) fixed some typos in the documentation.
 202. [jothepro](https://github.com/jothepro) updated links to the Hunter package.
-203. [Dave Lee](https://github.com/kastiglione) fixed link in the README.
+203. [Dave Lee](https://github.com/kastiglione) fixed a link in the README.
 204. [Joël Lamotte](https://github.com/Klaim) added instruction for using Build2's package manager.
 205. [Paul Jurczak](https://github.com/pauljurczak) fixed an example in the README.
 206. [Sonu Lohani](https://github.com/sonulohani) fixed a warning.
@@ -1647,7 +1620,7 @@ I deeply appreciate the help of the following people.
 243. [raduteo](https://github.com/raduteo) fixed a warning.
 244. [David Pfahler](https://github.com/theShmoo) added the possibility to compile the library without I/O support.
 245. [Morten Fyhn Amundsen](https://github.com/mortenfyhn) fixed a typo.
-246. [jpl-mac](https://github.com/jpl-mac) allowed to treat the library as a system header in CMake.
+246. [jpl-mac](https://github.com/jpl-mac) allowed treating the library as a system header in CMake.
 247. [Jason Dsouza](https://github.com/jasmcaus) fixed the indentation of the CMake file.
 248. [offa](https://github.com/offa) added a link to Conan Center to the documentation.
 249. [TotalCaesar659](https://github.com/TotalCaesar659) updated the links in the documentation to use HTTPS.
@@ -1689,7 +1662,7 @@ I deeply appreciate the help of the following people.
 285. [Wolf Vollprecht](https://github.com/wolfv) added the `patch_inplace` function.
 286. [Jake Zimmerman](https://github.com/jez) highlighted common usage patterns in the README file.
 287. [NN](https://github.com/NN---) added the Visual Studio output directory to `.gitignore`.
-288. [Romain Reignier](https://github.com/romainreignier) improved the performance the vector output adapter.
+288. [Romain Reignier](https://github.com/romainreignier) improved the performance of the vector output adapter.
 289. [Mike](https://github.com/Mike-Leo-Smith) fixed the `std::iterator_traits`.
 290. [Richard Hozák](https://github.com/zxey) added macro `JSON_NO_ENUM` to disable default enum conversions.
 291. [vakokako](https://github.com/vakokako) fixed tests when compiling with C++20.
@@ -1718,10 +1691,77 @@ I deeply appreciate the help of the following people.
 314. [Berkus Decker](https://github.com/berkus) fixed a typo in the README.
 315. [Illia Polishchuk](https://github.com/effolkronium) improved the CMake testing.
 316. [Ikko Ashimine](https://github.com/eltociear) fixed a typo.
+317. [Raphael Grimm](https://github.com/barcode) added the possibility to define a custom base class.
+318. [tocic](https://github.com/tocic) fixed typos in the documentation.
+319. [Vertexwahn](https://github.com/Vertexwahn) added Bazel build support.
+320. [Dirk Stolle](https://github.com/striezel) fixed typos in the documentation.
+321. [DavidKorczynski](https://github.com/DavidKorczynski) added a CIFuzz CI GitHub action.
+322. [Finkman](https://github.com/Finkman) fixed the debug pretty-printer.
+323. [Florian Segginger](https://github.com/floriansegginger) bumped the years in the README.
+324. [haadfida](https://github.com/haadfida) cleaned up the badges of used services.
+325. [Arsen Arsenović](https://github.com/ArsenArsen) fixed a build error.
+326. [theevilone45](https://github.com/theevilone45) fixed a typo in a CMake file.
+327. [Sergei Trofimovich](https://github.com/trofi) fixed the custom allocator support.
+328. [Joyce](https://github.com/joycebrum) fixed some security issues in the GitHub workflows.
+329. [Nicolas Jakob](https://github.com/njakob) add vcpkg version badge.
+330. [Tomerkm](https://github.com/Tomerkm) added tests.
+331. [No.](https://github.com/tusooa) fixed the use of `get<>` calls.
+332. [taro](https://github.com/tarolling) fixed a typo in the `CODEOWNERS` file.
+333. [Ikko Eltociear Ashimine](https://github.com/eltociear) fixed a typo.
+334. [Felix Yan](https://github.com/felixonmars) fixed a typo in the README.
+335. [HO-COOH](https://github.com/HO-COOH) fixed a parenthesis in the documentation.
+336. [Ivor Wanders](https://github.com/iwanders) fixed the examples to catch exception by `const&`.
+337. [miny1233](https://github.com/miny1233) fixed a parenthesis in the documentation.
+338. [tomalakgeretkal](https://github.com/tomalakgeretkal) fixed a compilation error.
+339. [alferov](https://github.com/ALF-ONE) fixed a compilation error.
+340. [Craig Scott](https://github.com/craigscott-crascit) fixed a deprecation warning in CMake.
+341. [Vyacheslav Zhdanovskiy](https://github.com/ZeronSix) added macros for serialization-only types.
+342. [Mathieu Westphal](https://github.com/mwestphal) fixed typos.
+343. [scribam](https://github.com/scribam) fixed the MinGW workflow.
+344. [Aleksei Sapitskii](https://github.com/aleksproger) added support for Apple's Swift Package Manager.
+345. [Benjamin Buch](https://github.com/bebuch) fixed the installation path in CMake.
+346. [Colby Haskell](https://github.com/colbychaskell) clarified the parse error message in case a file cannot be opened.
+347. [Juan Carlos Arevalo Baeza](https://github.com/TheJCAB) fixed the enum conversion.
+348. [alferov](https://github.com/ALF-ONE) fixed a version in the documentation.
+349. [ss](https://github.com/serge-s) fixed the amalgamation call.
+350. [AniketDhemare](https://github.com/AniketDhemare) fixed a version in the documentation.
+351. [Philip Müller](https://github.com/philip-paul-mueller) fixed an example.
+352. [Leila Shcheglova](https://github.com/LeilaShcheglova) fixed a warning in a test.
+353. [Alex Prabhat Bara](https://github.com/alexprabhat99) fixed a function name in the documentation.
+354. [laterlaugh](https://github.com/laterlaugh) fixed some typos.
+355. [Yuanhao Jia](https://github.com/MrJia1997) fixed the GDB pretty printer.
+356. [Fallen_Breath](https://github.com/Fallen-Breath) fixed an example for JSON Pointer.
+357. [Nikhil Idiculla](https://github.com/tsnl) fixed some typos.
+358. [Griffin Myers](https://github.com/gmyers18) updated the Natvis file.
+359. [thetimr](https://github.com/thetimr) fixed a typo in the documentation.
+360. [Balazs Erseki](https://github.com/zerocukor287) fixed a URL in the contribution guidelines.
+361. [Niccolò Iardella](https://github.com/rotolof) added `NLOHMANN_DEFINE_DERIVED_TYPE_*` macros.
+362. [Borislav Stanimirov](https://github.com/iboB) allowed overriding the CMake target name.
+363. [Captain Crutches](https://github.com/captaincrutches) made `iterator_proxy_value` a `std::forward_iterator`.
+364. [Fredrik Sandhei](https://github.com/fsandhei) added type conversion support for `std::optional`.
+365. [jh96](https://github.com/jordan-hoang) added exceptions when `nullptr` is passed to `parse`.
+366. [Stuart Gorman](https://github.com/StuartGorman) fixed number parsing when `EINTR` set in `errno`.
+367. [Dylan Baker](https://github.com/dcbaker) generated a pkg-config file that follows the pkg-config conventions.
+368. [Tianyi Chen](https://github.com/TianyiChen) optimized the binary `get_number` implementation.
+369. [peng-wang-cn](https://github.com/peng-wang-cn) added type conversion support for multidimensional arrays.
+370. [Einars Netlis-Galejs](https://github.com/EinarsNG) added `ONLY_SERIALIZE` for `NLOHMANN_DEFINE_DERIVED_TYPE_*` macros.
+371. [Marcel](https://github.com/mering) removed `alwayslink=True` Bazel flag.
+372. [Harinath Nampally](https://github.com/hnampally) added diagnostic positions to exceptions.
+373. [Nissim Armand Ben Danan](https://github.com/NissimBendanan) fixed `NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT` with an empty JSON instance.
+374. [Michael Valladolid](https://github.com/codenut) added support for BSON uint64 serialization/deserialization.
+375. [Nikhil](https://github.com/nikhilreddydev) updated the documentation.
+376. [Nebojša Cvetković](https://github.com/nebkat) added support for BJDATA optimized binary array type.
+377. [Sushrut Shringarputale](https://github.com/sushshring) added support for diagnostic positions. 
+378. [kimci86](https://github.com/kimci86) templated to `NLOHMANN_DEFINE_TYPE` macros to also support `ordered_json`.
+379. [Richard Topchii](https://github.com/richardtop) added support for VisionOS in the Swift Package Manager.
+380. [Robert Chisholm](https://github.com/Robadob) fixed a typo.
+381. [zjyhjqs](https://github.com/zjyhjqs) added CPack support.
+382. [bitFiedler](https://github.com/bitFiedler) made GDB pretty printer work with Python 3.8.
+383. [Gianfranco Costamagna](https://github.com/LocutusOfBorg) fixed a compiler warning.
+384. [risa2000](https://github.com/risa2000) made `std::filesystem::path` conversion to/from UTF-8 encoded string explicit.
 
 Thanks a lot for helping out! Please [let me know](mailto:mail@nlohmann.me) if I forgot someone.
 
-
 ## Used third-party tools
 
 The library itself consists of a single header file licensed under the MIT license. However, it is built, tested, documented, and whatnot using a lot of third-party tools and services. Thanks a lot!
@@ -1732,16 +1772,15 @@ The library itself consists of a single header file licensed under the MIT licen
 - [**Artistic Style**](http://astyle.sourceforge.net) for automatic source code indentation
 - [**Clang**](https://clang.llvm.org) for compilation with code sanitizers
 - [**CMake**](https://cmake.org) for build automation
-- [**Codacy**](https://www.codacy.com) for further [code analysis](https://www.codacy.com/app/nlohmann/json)
+- [**Codacy**](https://www.codacy.com) for further [code analysis](https://app.codacy.com/gh/nlohmann/json/dashboard)
 - [**Coveralls**](https://coveralls.io) to measure [code coverage](https://coveralls.io/github/nlohmann/json)
 - [**Coverity Scan**](https://scan.coverity.com) for [static analysis](https://scan.coverity.com/projects/nlohmann-json)
 - [**cppcheck**](http://cppcheck.sourceforge.net) for static analysis
 - [**doctest**](https://github.com/onqtam/doctest) for the unit tests
-- [**git-update-ghpages**](https://github.com/rstacruz/git-update-ghpages) to upload the documentation to gh-pages
 - [**GitHub Changelog Generator**](https://github.com/skywinder/github-changelog-generator) to generate the [ChangeLog](https://github.com/nlohmann/json/blob/develop/ChangeLog.md)
 - [**Google Benchmark**](https://github.com/google/benchmark) to implement the benchmarks
 - [**Hedley**](https://nemequ.github.io/hedley/) to avoid re-inventing several compiler-agnostic feature macros
-- [**lcov**](http://ltp.sourceforge.net/coverage/lcov.php) to process coverage information and create an HTML view
+- [**lcov**](https://github.com/linux-test-project/lcov) to process coverage information and create an HTML view
 - [**libFuzzer**](https://llvm.org/docs/LibFuzzer.html) to implement fuzz testing for OSS-Fuzz
 - [**Material for MkDocs**](https://squidfunk.github.io/mkdocs-material/) for the style of the documentation site
 - [**MkDocs**](https://www.mkdocs.org) for the documentation site
@@ -1749,19 +1788,13 @@ The library itself consists of a single header file licensed under the MIT licen
 - [**Probot**](https://probot.github.io) for automating maintainer tasks such as closing stale issues, requesting missing information, or detecting toxic comments.
 - [**Valgrind**](https://valgrind.org) to check for correct memory management
 
-
-## Projects using JSON for Modern C++
-
-The library is currently used in Apple macOS Sierra-Monterey and iOS 10-15. I am not sure what they are using the library for, but I am happy that it runs on so many devices.
-
-
 ## Notes
 
 ### Character encoding
 
 The library supports **Unicode input** as follows:
 
-- Only **UTF-8** encoded input is supported which is the default encoding for JSON according to [RFC 8259](https://tools.ietf.org/html/rfc8259.html#section-8.1).
+- Only **UTF-8** encoded input is supported, which is the default encoding for JSON according to [RFC 8259](https://tools.ietf.org/html/rfc8259.html#section-8.1).
 - `std::u16string` and `std::u32string` can be parsed, assuming UTF-16 and UTF-32 encoding, respectively. These encodings are not supported when reading from files or other input containers.
 - Other encodings such as Latin-1 or ISO 8859-1 are **not** supported and will yield parse or serialization errors.
 - [Unicode noncharacters](https://www.unicode.org/faq/private_use.html#nonchar1) will not be replaced by the library.
@@ -1776,14 +1809,24 @@ This library does not support comments by default. It does so for three reasons:
 
 1. Comments are not part of the [JSON specification](https://tools.ietf.org/html/rfc8259). You may argue that `//` or `/* */` are allowed in JavaScript, but JSON is not JavaScript.
 2. This was not an oversight: Douglas Crockford [wrote on this](https://plus.google.com/118095276221607585885/posts/RK8qyGVaGSr) in May 2012:
-
-	> I removed comments from JSON because I saw people were using them to hold parsing directives, a practice which would have destroyed interoperability.  I know that the lack of comments makes some people sad, but it shouldn't.
-
-	> Suppose you are using JSON to keep configuration files, which you would like to annotate. Go ahead and insert all the comments you like. Then pipe it through JSMin before handing it to your JSON parser.
-
+  
+    > I removed comments from JSON because I saw people were using them to hold parsing directives, a practice which would have destroyed interoperability.  I know that the lack of comments makes some people sad, but it shouldn't.
+    >
+    > Suppose you are using JSON to keep configuration files, which you would like to annotate. Go ahead and insert all the comments you like. Then pipe it through JSMin before handing it to your JSON parser.
+  
 3. It is dangerous for interoperability if some libraries would add comment support while others don't. Please check [The Harmful Consequences of the Robustness Principle](https://tools.ietf.org/html/draft-iab-protocol-maintenance-01) on this.
 
-However, you can pass set parameter `ignore_comments` to true in the `parse` function to ignore `//` or `/* */` comments. Comments will then be treated as whitespace.
+However, you can set set parameter `ignore_comments` to true in the `parse` function to ignore `//` or `/* */` comments. Comments will then be treated as whitespace.
+
+### Trailing commas
+
+The JSON specification does not allow trailing commas in arrays and objects, and hence this library is treating them as parsing errors by default.
+
+Like comments, you can set parameter `ignore_trailing_commas` to true in the `parse` function to ignore trailing commas in arrays and objects. Note that a single comma as the only content of the array or object (`[,]` or `{,}`) is not allowed, and multiple trailing commas (`[1,,]`) are not allowed either.
+
+This library does not add trailing commas when serializing JSON data.
+
+For more information, see [JSON With Commas and Comments (JWCC)](https://nigeltao.github.io/blog/2021/json-with-commas-comments.html).
 
 ### Order of object keys
 
@@ -1791,6 +1834,8 @@ By default, the library does not preserve the **insertion order of object elemen
 
 If you do want to preserve the insertion order, you can try the type [`nlohmann::ordered_json`](https://github.com/nlohmann/json/issues/2179). Alternatively, you can use a more sophisticated ordered map like [`tsl::ordered_map`](https://github.com/Tessil/ordered-map) ([integration](https://github.com/nlohmann/json/issues/546#issuecomment-304447518)) or [`nlohmann::fifo_map`](https://github.com/nlohmann/fifo_map) ([integration](https://github.com/nlohmann/json/issues/485#issuecomment-333652309)).
 
+See the [**documentation on object order**](https://json.nlohmann.me/features/object_order/) for more information.
+
 ### Memory Release
 
 We checked with Valgrind and the Address Sanitizer (ASAN) that there are no memory leaks.
@@ -1802,26 +1847,26 @@ Here is a related issue [#1924](https://github.com/nlohmann/json/issues/1924).
 
 ### Further notes
 
-- The code contains numerous debug **assertions** which can be switched off by defining the preprocessor macro `NDEBUG`, see the [documentation of `assert`](https://en.cppreference.com/w/cpp/error/assert). In particular, note [`operator[]`](https://json.nlohmann.me/api/basic_json/operator%5B%5D/) implements **unchecked access** for const objects: If the given key is not present, the behavior is undefined (think of a dereferenced null pointer) and yields an [assertion failure](https://github.com/nlohmann/json/issues/289) if assertions are switched on. If you are not sure whether an element in an object exists, use checked access with the [`at()` function](https://json.nlohmann.me/api/basic_json/at/). Furthermore, you can define `JSON_ASSERT(x)` to replace calls to `assert(x)`.
+- The code contains numerous debug **assertions** which can be switched off by defining the preprocessor macro `NDEBUG`, see the [documentation of `assert`](https://en.cppreference.com/w/cpp/error/assert). In particular, note [`operator[]`](https://json.nlohmann.me/api/basic_json/operator%5B%5D/) implements **unchecked access** for const objects: If the given key is not present, the behavior is undefined (think of a dereferenced null pointer) and yields an [assertion failure](https://github.com/nlohmann/json/issues/289) if assertions are switched on. If you are not sure whether an element in an object exists, use checked access with the [`at()` function](https://json.nlohmann.me/api/basic_json/at/). Furthermore, you can define `JSON_ASSERT(x)` to replace calls to `assert(x)`. See the [**documentation on runtime assertions**](https://json.nlohmann.me/features/assertions/) for more information.
 - As the exact number type is not defined in the [JSON specification](https://tools.ietf.org/html/rfc8259.html), this library tries to choose the best fitting C++ number type automatically. As a result, the type `double` may be used to store numbers which may yield [**floating-point exceptions**](https://github.com/nlohmann/json/issues/181) in certain rare situations if floating-point exceptions have been unmasked in the calling code. These exceptions are not caused by the library and need to be fixed in the calling code, such as by re-masking the exceptions prior to calling library functions.
 - The code can be compiled without C++ **runtime type identification** features; that is, you can use the `-fno-rtti` compiler flag.
-- **Exceptions** are used widely within the library. They can, however, be switched off with either using the compiler flag `-fno-exceptions` or by defining the symbol `JSON_NOEXCEPTION`. In this case, exceptions are replaced by `abort()` calls. You can further control this behavior by defining `JSON_THROW_USER` (overriding `throw`), `JSON_TRY_USER` (overriding `try`), and `JSON_CATCH_USER` (overriding `catch`). Note that `JSON_THROW_USER` should leave the current scope (e.g., by throwing or aborting), as continuing after it may yield undefined behavior. Note the explanatory [`what()`](https://en.cppreference.com/w/cpp/error/exception/what) string of exceptions is not available for MSVC if exceptions are disabled, see [#2824](https://github.com/nlohmann/json/discussions/2824).
+- **Exceptions** are used widely within the library. They can, however, be switched off with either using the compiler flag `-fno-exceptions` or by defining the symbol `JSON_NOEXCEPTION`. In this case, exceptions are replaced by `abort()` calls. You can further control this behavior by defining `JSON_THROW_USER` (overriding `throw`), `JSON_TRY_USER` (overriding `try`), and `JSON_CATCH_USER` (overriding `catch`). Note that `JSON_THROW_USER` should leave the current scope (e.g., by throwing or aborting), as continuing after it may yield undefined behavior. Note the explanatory [`what()`](https://en.cppreference.com/w/cpp/error/exception/what) string of exceptions is not available for MSVC if exceptions are disabled, see [#2824](https://github.com/nlohmann/json/discussions/2824). See the [**documentation of exceptions**](https://json.nlohmann.me/home/exceptions/) for more information.
 
 ## Execute unit tests
 
 To compile and run the tests, you need to execute
 
-```sh
-$ mkdir build
-$ cd build
-$ cmake .. -DJSON_BuildTests=On
-$ cmake --build .
-$ ctest --output-on-failure
+```shell
+mkdir build
+cd build
+cmake .. -DJSON_BuildTests=On
+cmake --build .
+ctest --output-on-failure
 ```
 
 Note that during the `ctest` stage, several JSON test files are downloaded from an [external repository](https://github.com/nlohmann/json_test_data). If policies forbid downloading artifacts during testing, you can download the files yourself and pass the directory with the test files via `-DJSON_TestDataDirectory=path` to CMake. Then, no Internet connectivity is required. See [issue #2189](https://github.com/nlohmann/json/issues/2189) for more information.
 
-If the test suite is not found, several test suites will fail like this:
+If the testdata is not found, several test suites will fail like this:
 
 ```
 ===============================================================================
@@ -1839,8 +1884,10 @@ json/tests/src/make_test_data_available.hpp:23: FATAL ERROR: REQUIRE( utils::che
 
 In case you have downloaded the library rather than checked out the code via Git, test `cmake_fetch_content_configure` will fail. Please execute `ctest -LE git_required` to skip these tests. See [issue #2189](https://github.com/nlohmann/json/issues/2189) for more information.
 
-Some tests change the installed files and hence make the whole process not reproducible. Please execute `ctest -LE not_reproducible` to skip these tests. See [issue #2324](https://github.com/nlohmann/json/issues/2324) for more information.
+Some tests are requiring network to be properly execute. They are labeled as `git_required`. Please execute `ctest -LE git_required` to skip these tests. See [issue #4851](https://github.com/nlohmann/json/issues/4851) for more information.
+
+Some tests change the installed files and hence make the whole process not reproducible. Please execute `ctest -LE not_reproducible` to skip these tests. See [issue #2324](https://github.com/nlohmann/json/issues/2324) for more information. Furthermore, assertions must be switched off to ensure reproducible builds (see [discussion 4494](https://github.com/nlohmann/json/discussions/4494)).
 
 Note you need to call `cmake -LE "not_reproducible|git_required"` to exclude both labels. See [issue #2596](https://github.com/nlohmann/json/issues/2596) for more information.
 
-As Intel compilers use unsafe floating point optimization by default, the unit tests may fail. Use flag [`/fp:precise`](https://software.intel.com/content/www/us/en/develop/documentation/cpp-compiler-developer-guide-and-reference/top/compiler-reference/compiler-options/compiler-option-details/floating-point-options/fp-model-fp.html) then.
+As Intel compilers use unsafe floating point optimization by default, the unit tests may fail. Use flag [`/fp:precise`](https://www.intel.com/content/www/us/en/docs/cpp-compiler/developer-guide-reference/2021-8/fp-model-fp.html) then.

cmake/ci.cmake

@@ -8,34 +8,24 @@ set(N 10)
 include(FindPython3)
 find_package(Python3 COMPONENTS Interpreter)
 
-find_program(ASTYLE_TOOL NAMES astyle)
-execute_process(COMMAND ${ASTYLE_TOOL} --version OUTPUT_VARIABLE ASTYLE_TOOL_VERSION ERROR_VARIABLE ASTYLE_TOOL_VERSION)
-string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" ASTYLE_TOOL_VERSION "${ASTYLE_TOOL_VERSION}")
-message(STATUS "🔖 Artistic Style ${ASTYLE_TOOL_VERSION} (${ASTYLE_TOOL})")
-
-find_program(CLANG_TOOL NAMES clang++-HEAD clang++-15 clang++-14 clang++-13 clang++-12 clang++-11 clang++)
+find_program(CLANG_TOOL NAMES clang++-HEAD clang++ clang++-20 clang++-19 clang++-18 clang++-17 clang++-16 clang++-15 clang++-14 clang++-13 clang++-12 clang++-11 clang++)
 execute_process(COMMAND ${CLANG_TOOL} --version OUTPUT_VARIABLE CLANG_TOOL_VERSION ERROR_VARIABLE CLANG_TOOL_VERSION)
 string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" CLANG_TOOL_VERSION "${CLANG_TOOL_VERSION}")
 message(STATUS "🔖 Clang ${CLANG_TOOL_VERSION} (${CLANG_TOOL})")
 
-find_program(CLANG_TIDY_TOOL NAMES clang-tidy-15 clang-tidy-14 clang-tidy-13 clang-tidy-12 clang-tidy-11 clang-tidy)
+find_program(CLANG_TIDY_TOOL NAMES clang-tidy-20 clang-tidy-19 clang-tidy-18 clang-tidy-17 clang-tidy-16 clang-tidy-15 clang-tidy-14 clang-tidy-13 clang-tidy-12 clang-tidy-11 clang-tidy)
 execute_process(COMMAND ${CLANG_TIDY_TOOL} --version OUTPUT_VARIABLE CLANG_TIDY_TOOL_VERSION ERROR_VARIABLE CLANG_TIDY_TOOL_VERSION)
 string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" CLANG_TIDY_TOOL_VERSION "${CLANG_TIDY_TOOL_VERSION}")
 message(STATUS "🔖 Clang-Tidy ${CLANG_TIDY_TOOL_VERSION} (${CLANG_TIDY_TOOL})")
 
 message(STATUS "🔖 CMake ${CMAKE_VERSION} (${CMAKE_COMMAND})")
 
-find_program(CPPCHECK_TOOL NAMES cppcheck)
-execute_process(COMMAND ${CPPCHECK_TOOL} --version OUTPUT_VARIABLE CPPCHECK_TOOL_VERSION ERROR_VARIABLE CPPCHECK_TOOL_VERSION)
-string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" CPPCHECK_TOOL_VERSION "${CPPCHECK_TOOL_VERSION}")
-message(STATUS "🔖 Cppcheck ${CPPCHECK_TOOL_VERSION} (${CPPCHECK_TOOL})")
-
-find_program(GCC_TOOL NAMES g++-latest g++-HEAD g++-11 g++-10)
+find_program(GCC_TOOL NAMES g++-latest g++-HEAD g++ g++-15 g++-14 g++-13 g++-12 g++-11 g++-10)
 execute_process(COMMAND ${GCC_TOOL} --version OUTPUT_VARIABLE GCC_TOOL_VERSION ERROR_VARIABLE GCC_TOOL_VERSION)
 string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" GCC_TOOL_VERSION "${GCC_TOOL_VERSION}")
 message(STATUS "🔖 GCC ${GCC_TOOL_VERSION} (${GCC_TOOL})")
 
-find_program(GCOV_TOOL NAMES gcov-HEAD gcov-11 gcov-10 gcov)
+find_program(GCOV_TOOL NAMES gcov-HEAD gcov gcov-15 gcov-14 gcov-13 gcov-12 gcov-11 gcov-10)
 execute_process(COMMAND ${GCOV_TOOL} --version OUTPUT_VARIABLE GCOV_TOOL_VERSION ERROR_VARIABLE GCOV_TOOL_VERSION)
 string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" GCOV_TOOL_VERSION "${GCOV_TOOL_VERSION}")
 message(STATUS "🔖 GCOV ${GCOV_TOOL_VERSION} (${GCOV_TOOL})")
@@ -88,330 +78,8 @@ file(GLOB_RECURSE SRC_FILES ${PROJECT_SOURCE_DIR}/include/nlohmann/*.hpp)
 # Thorough check with recent compilers
 ###############################################################################
 
-# Ignored Clang warnings:
-# -Wno-c++98-compat               The library targets C++11.
-# -Wno-c++98-compat-pedantic      The library targets C++11.
-# -Wno-deprecated-declarations    The library contains annotations for deprecated functions.
-# -Wno-extra-semi-stmt            The library uses std::assert which triggers this warning.
-# -Wno-padded                     We do not care about padding warnings.
-# -Wno-covered-switch-default     All switches list all cases and a default case.
-# -Wno-weak-vtables               The library is header-only.
-# -Wreserved-identifier           See https://github.com/onqtam/doctest/issues/536.
-
-set(CLANG_CXXFLAGS
-    -Werror
-    -Weverything
-    -Wno-c++98-compat
-    -Wno-c++98-compat-pedantic
-    -Wno-deprecated-declarations
-    -Wno-extra-semi-stmt
-    -Wno-padded
-    -Wno-covered-switch-default
-    -Wno-weak-vtables
-    -Wno-reserved-identifier
-)
-
-# Warning flags determined for GCC 13.0 (experimental) with https://github.com/nlohmann/gcc_flags:
-# Ignored GCC warnings:
-# -Wno-abi-tag                    We do not care about ABI tags.
-# -Wno-aggregate-return           The library uses aggregate returns.
-# -Wno-long-long                  The library uses the long long type to interface with system functions.
-# -Wno-namespaces                 The library uses namespaces.
-# -Wno-padded                     We do not care about padding warnings.
-# -Wno-system-headers             We do not care about warnings in system headers.
-# -Wno-templates                  The library uses templates.
-
-set(GCC_CXXFLAGS
-    -pedantic
-    -Werror
-    --all-warnings
-    --extra-warnings
-    -W
-    -WNSObject-attribute
-    -Wno-abi-tag
-    -Waddress
-    -Waddress-of-packed-member
-    -Wno-aggregate-return
-    -Waggressive-loop-optimizations
-    -Waligned-new=all
-    -Wall
-    -Walloc-zero
-    -Walloca
-    -Wanalyzer-double-fclose
-    -Wanalyzer-double-free
-    -Wanalyzer-exposure-through-output-file
-    -Wanalyzer-file-leak
-    -Wanalyzer-free-of-non-heap
-    -Wanalyzer-malloc-leak
-    -Wanalyzer-mismatching-deallocation
-    -Wanalyzer-null-argument
-    -Wanalyzer-null-dereference
-    -Wanalyzer-possible-null-argument
-    -Wanalyzer-possible-null-dereference
-    -Wanalyzer-shift-count-negative
-    -Wanalyzer-shift-count-overflow
-    -Wanalyzer-stale-setjmp-buffer
-    -Wanalyzer-tainted-allocation-size
-    -Wanalyzer-tainted-array-index
-    -Wanalyzer-tainted-divisor
-    -Wanalyzer-tainted-offset
-    -Wanalyzer-tainted-size
-    -Wanalyzer-too-complex
-    -Wanalyzer-unsafe-call-within-signal-handler
-    -Wanalyzer-use-after-free
-    -Wanalyzer-use-of-pointer-in-stale-stack-frame
-    -Wanalyzer-use-of-uninitialized-value
-    -Wanalyzer-va-arg-type-mismatch
-    -Wanalyzer-va-list-exhausted
-    -Wanalyzer-va-list-leak
-    -Wanalyzer-va-list-use-after-va-end
-    -Wanalyzer-write-to-const
-    -Wanalyzer-write-to-string-literal
-    -Warith-conversion
-    -Warray-bounds=2
-    -Warray-compare
-    -Warray-parameter=2
-    -Wattribute-alias=2
-    -Wattribute-warning
-    -Wattributes
-    -Wbool-compare
-    -Wbool-operation
-    -Wbuiltin-declaration-mismatch
-    -Wbuiltin-macro-redefined
-    -Wc++0x-compat
-    -Wc++11-compat
-    -Wc++11-extensions
-    -Wc++14-compat
-    -Wc++14-extensions
-    -Wc++17-compat
-    -Wc++17-extensions
-    -Wc++1z-compat
-    -Wc++20-compat
-    -Wc++20-extensions
-    -Wc++23-extensions
-    -Wc++2a-compat
-    -Wcannot-profile
-    -Wcast-align
-    -Wcast-align=strict
-    -Wcast-function-type
-    -Wcast-qual
-    -Wcatch-value=3
-    -Wchar-subscripts
-    -Wclass-conversion
-    -Wclass-memaccess
-    -Wclobbered
-    -Wcomma-subscript
-    -Wcomment
-    -Wcomments
-    -Wconditionally-supported
-    -Wconversion
-    -Wconversion-null
-    -Wcoverage-invalid-line-number
-    -Wcoverage-mismatch
-    -Wcpp
-    -Wctad-maybe-unsupported
-    -Wctor-dtor-privacy
-    -Wdangling-else
-    -Wdangling-pointer=2
-    -Wdate-time
-    -Wdelete-incomplete
-    -Wdelete-non-virtual-dtor
-    -Wdeprecated
-    -Wdeprecated-copy
-    -Wdeprecated-copy-dtor
-    -Wdeprecated-declarations
-    -Wdeprecated-enum-enum-conversion
-    -Wdeprecated-enum-float-conversion
-    -Wdisabled-optimization
-    -Wdiv-by-zero
-    -Wdouble-promotion
-    -Wduplicated-branches
-    -Wduplicated-cond
-    -Weffc++
-    -Wempty-body
-    -Wendif-labels
-    -Wenum-compare
-    -Wenum-conversion
-    -Wexceptions
-    -Wexpansion-to-defined
-    -Wextra
-    -Wextra-semi
-    -Wfloat-conversion
-    -Wfloat-equal
-    -Wformat-diag
-    -Wformat-overflow=2
-    -Wformat-signedness
-    -Wformat-truncation=2
-    -Wformat=2
-    -Wframe-address
-    -Wfree-nonheap-object
-    -Whsa
-    -Wif-not-aligned
-    -Wignored-attributes
-    -Wignored-qualifiers
-    -Wimplicit-fallthrough=5
-    -Winaccessible-base
-    -Winfinite-recursion
-    -Winherited-variadic-ctor
-    -Winit-list-lifetime
-    -Winit-self
-    -Winline
-    -Wint-in-bool-context
-    -Wint-to-pointer-cast
-    -Winterference-size
-    -Winvalid-imported-macros
-    -Winvalid-memory-model
-    -Winvalid-offsetof
-    -Winvalid-pch
-    -Wliteral-suffix
-    -Wlogical-not-parentheses
-    -Wlogical-op
-    -Wno-long-long
-    -Wlto-type-mismatch
-    -Wmain
-    -Wmaybe-uninitialized
-    -Wmemset-elt-size
-    -Wmemset-transposed-args
-    -Wmisleading-indentation
-    -Wmismatched-dealloc
-    -Wmismatched-new-delete
-    -Wmismatched-tags
-    -Wmissing-attributes
-    -Wmissing-braces
-    -Wmissing-declarations
-    -Wmissing-field-initializers
-    -Wmissing-include-dirs
-    -Wmissing-profile
-    -Wmissing-requires
-    -Wmissing-template-keyword
-    -Wmultichar
-    -Wmultiple-inheritance
-    -Wmultistatement-macros
-    -Wno-namespaces
-    -Wnarrowing
-    -Wnoexcept
-    -Wnoexcept-type
-    -Wnon-template-friend
-    -Wnon-virtual-dtor
-    -Wnonnull
-    -Wnonnull-compare
-    -Wnormalized=nfkc
-    -Wnull-dereference
-    -Wodr
-    -Wold-style-cast
-    -Wopenacc-parallelism
-    -Wopenmp-simd
-    -Woverflow
-    -Woverlength-strings
-    -Woverloaded-virtual
-    -Wpacked
-    -Wpacked-bitfield-compat
-    -Wpacked-not-aligned
-    -Wno-padded
-    -Wparentheses
-    -Wpedantic
-    -Wpessimizing-move
-    -Wplacement-new=2
-    -Wpmf-conversions
-    -Wpointer-arith
-    -Wpointer-compare
-    -Wpragmas
-    -Wprio-ctor-dtor
-    -Wpsabi
-    -Wrange-loop-construct
-    -Wredundant-decls
-    -Wredundant-move
-    -Wredundant-tags
-    -Wregister
-    -Wreorder
-    -Wrestrict
-    -Wreturn-local-addr
-    -Wreturn-type
-    -Wscalar-storage-order
-    -Wsequence-point
-    -Wshadow=compatible-local
-    -Wshadow=global
-    -Wshadow=local
-    -Wshift-count-negative
-    -Wshift-count-overflow
-    -Wshift-negative-value
-    -Wshift-overflow=2
-    -Wsign-compare
-    -Wsign-conversion
-    -Wsign-promo
-    -Wsized-deallocation
-    -Wsizeof-array-argument
-    -Wsizeof-array-div
-    -Wsizeof-pointer-div
-    -Wsizeof-pointer-memaccess
-    -Wstack-protector
-    -Wstrict-aliasing=3
-    -Wstrict-null-sentinel
-    -Wno-strict-overflow
-    -Wstring-compare
-    -Wstringop-overflow=4
-    -Wstringop-overread
-    -Wstringop-truncation
-    -Wsubobject-linkage
-    -Wsuggest-attribute=cold
-    -Wsuggest-attribute=const
-    -Wsuggest-attribute=format
-    -Wsuggest-attribute=malloc
-    -Wsuggest-attribute=noreturn
-    -Wsuggest-attribute=pure
-    -Wsuggest-final-methods
-    -Wsuggest-final-types
-    -Wsuggest-override
-    -Wswitch
-    -Wswitch-bool
-    -Wswitch-default
-    -Wswitch-enum
-    -Wswitch-outside-range
-    -Wswitch-unreachable
-    -Wsync-nand
-    -Wsynth
-    -Wno-system-headers
-    -Wtautological-compare
-    -Wno-templates
-    -Wterminate
-    -Wtrampolines
-    -Wtrigraphs
-    -Wtrivial-auto-var-init
-    -Wtsan
-    -Wtype-limits
-    -Wundef
-    -Wuninitialized
-    -Wunknown-pragmas
-    -Wunreachable-code
-    -Wunsafe-loop-optimizations
-    -Wunused
-    -Wunused-but-set-parameter
-    -Wunused-but-set-variable
-    -Wunused-const-variable=2
-    -Wunused-function
-    -Wunused-label
-    -Wunused-local-typedefs
-    -Wunused-macros
-    -Wunused-parameter
-    -Wunused-result
-    -Wunused-value
-    -Wunused-variable
-    -Wuse-after-free=3
-    -Wuseless-cast
-    -Wvarargs
-    -Wvariadic-macros
-    -Wvector-operation-performance
-    -Wvexing-parse
-    -Wvirtual-inheritance
-    -Wvirtual-move-assign
-    -Wvla
-    -Wvla-parameter
-    -Wvolatile
-    -Wvolatile-register-var
-    -Wwrite-strings
-    -Wzero-as-null-pointer-constant
-    -Wzero-length-bounds
-)
+include(clang_flags)
+include(gcc_flags)
 
 add_custom_target(ci_test_gcc
     COMMAND CXX=${GCC_TOOL} CXXFLAGS="${GCC_CXXFLAGS}" ${CMAKE_COMMAND}
@@ -437,7 +105,7 @@ add_custom_target(ci_test_clang
 # Different C++ Standards.
 ###############################################################################
 
-foreach(CXX_STANDARD 11 14 17 20)
+foreach(CXX_STANDARD 11 14 17 20 23 26)
     add_custom_target(ci_test_gcc_cxx${CXX_STANDARD}
         COMMAND CXX=${GCC_TOOL} CXXFLAGS="${GCC_CXXFLAGS}" ${CMAKE_COMMAND}
             -DCMAKE_BUILD_TYPE=Debug -GNinja
@@ -459,6 +127,19 @@ foreach(CXX_STANDARD 11 14 17 20)
         COMMAND cd ${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD} && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
         COMMENT "Compile and test with Clang for C++${CXX_STANDARD}"
     )
+
+    add_custom_target(ci_test_clang_libcxx_cxx${CXX_STANDARD}
+        COMMAND CXX=${CLANG_TOOL} CXXFLAGS="${CLANG_CXXFLAGS}" ${CMAKE_COMMAND}
+            -DCMAKE_BUILD_TYPE=Debug -GNinja
+            -DJSON_BuildTests=ON -DJSON_FastTests=ON
+            -DJSON_TestStandards=${CXX_STANDARD}
+            -DCMAKE_CXX_FLAGS="-stdlib=libc++"
+            -DCMAKE_EXE_LINKER_FLAGS="-lc++abi"
+            -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD}
+        COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD}
+        COMMAND cd ${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD} && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+        COMMENT "Compile and test with Clang for C++${CXX_STANDARD} (libc++)"
+    )
 endforeach()
 
 ###############################################################################
@@ -466,7 +147,7 @@ endforeach()
 ###############################################################################
 
 add_custom_target(ci_test_noexceptions
-    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+    COMMAND ${CMAKE_COMMAND}
     -DCMAKE_BUILD_TYPE=Debug -GNinja
     -DJSON_BuildTests=ON -DCMAKE_CXX_FLAGS=-DJSON_NOEXCEPTION -DDOCTEST_TEST_FILTER=--no-throw
     -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_noexceptions
@@ -480,7 +161,7 @@ add_custom_target(ci_test_noexceptions
 ###############################################################################
 
 add_custom_target(ci_test_noimplicitconversions
-    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+    COMMAND ${CMAKE_COMMAND}
     -DCMAKE_BUILD_TYPE=Debug -GNinja
     -DJSON_BuildTests=ON -DJSON_ImplicitConversions=OFF
     -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_noimplicitconversions
@@ -494,7 +175,7 @@ add_custom_target(ci_test_noimplicitconversions
 ###############################################################################
 
 add_custom_target(ci_test_diagnostics
-    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+    COMMAND ${CMAKE_COMMAND}
     -DCMAKE_BUILD_TYPE=Debug -GNinja
     -DJSON_BuildTests=ON -DJSON_Diagnostics=ON
     -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_diagnostics
@@ -503,12 +184,26 @@ add_custom_target(ci_test_diagnostics
     COMMENT "Compile and test with improved diagnostics enabled"
 )
 
+###############################################################################
+# Enable diagnostic positions support.
+###############################################################################
+
+add_custom_target(ci_test_diagnostic_positions
+    COMMAND ${CMAKE_COMMAND}
+    -DCMAKE_BUILD_TYPE=Debug -GNinja
+    -DJSON_BuildTests=ON -DJSON_Diagnostic_Positions=ON
+    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_diagnostic_positions
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_diagnostic_positions
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_diagnostic_positions && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with diagnostic positions enabled"
+)
+
 ###############################################################################
 # Enable legacy discarded value comparison.
 ###############################################################################
 
 add_custom_target(ci_test_legacycomparison
-    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+    COMMAND ${CMAKE_COMMAND}
     -DCMAKE_BUILD_TYPE=Debug -GNinja
     -DJSON_BuildTests=ON -DJSON_LegacyDiscardedValueComparison=ON
     -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_legacycomparison
@@ -522,7 +217,7 @@ add_custom_target(ci_test_legacycomparison
 ###############################################################################
 
 add_custom_target(ci_test_noglobaludls
-    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+    COMMAND ${CMAKE_COMMAND}
     -DCMAKE_BUILD_TYPE=Debug -GNinja
     -DJSON_BuildTests=ON -DJSON_FastTests=ON -DJSON_GlobalUDLs=OFF
     -DCMAKE_CXX_FLAGS=-DJSON_TEST_NO_GLOBAL_UDLS
@@ -551,8 +246,8 @@ add_custom_target(ci_test_coverage
     COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_coverage32
     COMMAND cd ${PROJECT_BINARY_DIR}/build_coverage32 && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
 
-    COMMAND ${LCOV_TOOL} --directory . --capture --output-file json.info --rc lcov_branch_coverage=1
-    COMMAND ${LCOV_TOOL} -e json.info ${SRC_FILES} --output-file json.info.filtered --rc lcov_branch_coverage=1
+    COMMAND ${LCOV_TOOL} --directory . --capture --output-file json.info --rc branch_coverage=1 --rc geninfo_unexecuted_blocks=1 --ignore-errors mismatch --ignore-errors unused
+    COMMAND ${LCOV_TOOL} -e json.info ${SRC_FILES} --output-file json.info.filtered --rc branch_coverage=1 --ignore-errors unused
     COMMAND ${CMAKE_SOURCE_DIR}/tests/thirdparty/imapdl/filterbr.py json.info.filtered > json.info.filtered.noexcept
     COMMAND genhtml --title "JSON for Modern C++" --legend --demangle-cpp --output-directory html --show-details --branch-coverage json.info.filtered.noexcept
 
@@ -579,8 +274,6 @@ add_custom_target(ci_test_clang_sanitizer
 # Check if header is amalgamated and sources are properly indented.
 ###############################################################################
 
-set(ASTYLE_FLAGS --style=allman --indent=spaces=4 --indent-modifiers --indent-switches --indent-preproc-block --indent-preproc-define --indent-col1-comments --pad-oper --pad-header --align-pointer=type --align-reference=type --add-brackets --convert-tabs --close-templates --lineend=linux --preserve-date --formatted)
-
 file(GLOB_RECURSE INDENT_FILES
     ${PROJECT_SOURCE_DIR}/include/nlohmann/*.hpp
         ${PROJECT_SOURCE_DIR}/tests/src/*.cpp
@@ -596,14 +289,18 @@ add_custom_target(ci_test_amalgamation
     COMMAND cp ${include_dir}/json.hpp ${include_dir}/json.hpp~
     COMMAND cp ${include_dir}/json_fwd.hpp ${include_dir}/json_fwd.hpp~
 
+    COMMAND ${Python3_EXECUTABLE} -mvenv venv_astyle
+    COMMAND venv_astyle/bin/pip3 --quiet install -r ${CMAKE_SOURCE_DIR}/tools/astyle/requirements.txt
+    COMMAND venv_astyle/bin/astyle --version
+
     COMMAND ${Python3_EXECUTABLE} ${tool_dir}/amalgamate.py -c ${tool_dir}/config_json.json -s .
     COMMAND ${Python3_EXECUTABLE} ${tool_dir}/amalgamate.py -c ${tool_dir}/config_json_fwd.json -s .
-    COMMAND ${ASTYLE_TOOL} ${ASTYLE_FLAGS} --suffix=none --quiet ${include_dir}/json.hpp ${include_dir}/json_fwd.hpp
+    COMMAND venv_astyle/bin/astyle --project=tools/astyle/.astylerc --suffix=none ${include_dir}/json.hpp ${include_dir}/json_fwd.hpp
 
     COMMAND diff ${include_dir}/json.hpp~ ${include_dir}/json.hpp
     COMMAND diff ${include_dir}/json_fwd.hpp~ ${include_dir}/json_fwd.hpp
 
-    COMMAND ${ASTYLE_TOOL} ${ASTYLE_FLAGS} ${INDENT_FILES}
+    COMMAND venv_astyle/bin/astyle --project=tools/astyle/.astylerc --suffix=orig ${INDENT_FILES}
     COMMAND for FILE in `find . -name '*.orig'`\; do false \; done
 
     WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
@@ -615,7 +312,7 @@ add_custom_target(ci_test_amalgamation
 ###############################################################################
 
 add_custom_target(ci_test_single_header
-    COMMAND CXX=${GCC_TOOL} CXXFLAGS="${GCC_CXXFLAGS}" ${CMAKE_COMMAND}
+    COMMAND ${CMAKE_COMMAND}
         -DCMAKE_BUILD_TYPE=Debug -GNinja
         -DJSON_BuildTests=ON -DJSON_MultipleHeaders=OFF -DJSON_FastTests=ON
         -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_single_header
@@ -658,7 +355,16 @@ add_custom_target(ci_clang_analyze
 ###############################################################################
 
 add_custom_target(ci_cppcheck
-    COMMAND ${CPPCHECK_TOOL} --enable=warning --suppress=missingReturn --inline-suppr --inconclusive --force --std=c++11 ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp --error-exitcode=1
+    COMMAND mkdir -p cppcheck
+    COMMAND clang -dM -E -x c++ -std=c++11 ${CMAKE_SOURCE_DIR}/include/nlohmann/thirdparty/hedley/hedley.hpp > default_defines.hpp 2> /dev/null
+    COMMAND ${Python3_EXECUTABLE} -mvenv venv_cppcheck
+    COMMAND venv_cppcheck/bin/pip3 --quiet install -r ${CMAKE_SOURCE_DIR}/cmake/requirements/requirements-cppcheck.txt
+    COMMAND venv_cppcheck/bin/cppcheck --enable=warning --check-level=exhaustive --inline-suppr --inconclusive --force
+            --std=c++11 ${PROJECT_SOURCE_DIR}/include/nlohmann/json.hpp -I ${CMAKE_SOURCE_DIR}/include
+            --error-exitcode=1 --relative-paths=${PROJECT_SOURCE_DIR} -j ${N} --include=default_defines.hpp
+            --cppcheck-build-dir=cppcheck --check-level=exhaustive
+            -UJSON_CATCH_USER -UJSON_TRY_USER -UJSON_ASSERT -UJSON_INTERNAL_CATCH -UJSON_THROW
+            -DJSON_HAS_CPP_11 -UJSON_HAS_CPP_14 -UJSON_HAS_CPP_17 -UJSON_HAS_CPP_20 -UJSON_HAS_THREE_WAY_COMPARISON
     COMMENT "Check code with Cppcheck"
 )
 
@@ -667,8 +373,11 @@ add_custom_target(ci_cppcheck
 ###############################################################################
 
 add_custom_target(ci_cpplint
-    COMMAND ${Python3_EXECUTABLE} ${CMAKE_SOURCE_DIR}/tools/cpplint/cpplint.py --filter=-whitespace,-legal,-runtime/references,-runtime/explicit,-runtime/indentation_namespace,-readability/casting,-readability/nolint --quiet --recursive ${SRC_FILES}
+    COMMAND ${Python3_EXECUTABLE} -mvenv venv_cpplint
+    COMMAND venv_cpplint/bin/pip3 --quiet install -r ${CMAKE_SOURCE_DIR}/cmake/requirements/requirements-cpplint.txt
+    COMMAND venv_cpplint/bin/cpplint --filter=-whitespace,-legal,-runtime/references,-runtime/explicit,-runtime/indentation_namespace,-readability/casting,-readability/nolint --quiet --recursive ${SRC_FILES}
     COMMENT "Check code with cpplint"
+    WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
 )
 
 ###############################################################################
@@ -832,43 +541,42 @@ add_custom_target(ci_benchmarks
 # CMake flags
 ###############################################################################
 
+# we test the project with different CMake versions:
+# - CMake 3.5 (the earliest supported)
+# - CMake 3.31.6 (the latest 3.x release)
+# - CMake 4.0.0 (the latest release)
+
 function(ci_get_cmake version var)
-    if (APPLE)
-        set(${var} ${PROJECT_BINARY_DIR}/cmake-${version}-Darwin64/CMake.app/Contents/bin/cmake)
-        add_custom_command(
-            OUTPUT ${${var}}
-            COMMAND wget -nc https://github.com/Kitware/CMake/releases/download/v${version}/cmake-${version}-Darwin64.tar.gz
-            COMMAND tar xfz cmake-${version}-Darwin64.tar.gz
-            COMMAND rm cmake-${version}-Darwin64.tar.gz
-            WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
-            COMMENT "Download CMake ${version}"
-        )
-    else()
-        set(${var} ${PROJECT_BINARY_DIR}/cmake-${version}-Linux-x86_64/bin/cmake)
-        add_custom_command(
-            OUTPUT ${${var}}
-            COMMAND wget -nc https://github.com/Kitware/CMake/releases/download/v${version}/cmake-${version}-Linux-x86_64.tar.gz
-            COMMAND tar xfz cmake-${version}-Linux-x86_64.tar.gz
-            COMMAND rm cmake-${version}-Linux-x86_64.tar.gz
-            WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
-            COMMENT "Download CMake ${version}"
-        )
-    endif()
+    set(${var} ${PROJECT_BINARY_DIR}/cmake-${version}/bin/cmake)
+    add_custom_command(
+        OUTPUT ${${var}}
+        COMMAND wget -nc https://github.com/Kitware/CMake/releases/download/v${version}/cmake-${version}.tar.gz
+        COMMAND tar xfz cmake-${version}.tar.gz
+        COMMAND rm cmake-${version}.tar.gz
+        # -DCMAKE_POLICY_VERSION_MINIMUM=3.5 required to compile older CMake versions with CMake 4.0.0
+        COMMAND cmake -S cmake-${version} -B cmake-${version} -DCMAKE_POLICY_VERSION_MINIMUM=3.5
+        COMMAND cmake --build cmake-${version} --parallel 10
+        WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
+        COMMENT "Download CMake ${version}"
+    )
     set(${var} ${${var}} PARENT_SCOPE)
 endfunction()
 
-ci_get_cmake(3.1.0 CMAKE_3_1_0_BINARY)
-ci_get_cmake(3.13.0 CMAKE_3_13_0_BINARY)
+ci_get_cmake(3.5.0  CMAKE_3_5_0_BINARY)
+ci_get_cmake(3.31.6 CMAKE_3_31_6_BINARY)
+ci_get_cmake(4.0.0  CMAKE_4_0_0_BINARY)
 
-set(JSON_CMAKE_FLAGS_3_1_0 JSON_Diagnostics JSON_GlobalUDLs JSON_ImplicitConversions JSON_DisableEnumSerialization
+# the tests require CMake 3.13 or later, so they are excluded for CMake 3.5.0
+set(JSON_CMAKE_FLAGS_3_5_0 JSON_Diagnostics JSON_Diagnostic_Positions JSON_GlobalUDLs JSON_ImplicitConversions JSON_DisableEnumSerialization
     JSON_LegacyDiscardedValueComparison JSON_Install JSON_MultipleHeaders JSON_SystemInclude JSON_Valgrind)
-set(JSON_CMAKE_FLAGS_3_13_0 JSON_BuildTests)
+set(JSON_CMAKE_FLAGS_3_31_6 JSON_BuildTests ${JSON_CMAKE_FLAGS_3_31_6})
+set(JSON_CMAKE_FLAGS_4_0_0 JSON_BuildTests ${JSON_CMAKE_FLAGS_3_5_0})
 
 function(ci_add_cmake_flags_targets flag min_version)
     string(TOLOWER "ci_cmake_flag_${flag}" flag_target)
     string(REPLACE . _ min_version_var ${min_version})
     set(cmake_binary ${CMAKE_${min_version_var}_BINARY})
-    add_custom_target(${flag_target}
+    add_custom_target(${flag_target}_${min_version}_2
         COMMENT "Check CMake flag ${flag} (CMake ${CMAKE_VERSION})"
         COMMAND ${CMAKE_COMMAND}
             -Werror=dev
@@ -888,12 +596,16 @@ function(ci_add_cmake_flags_targets flag min_version)
     set(JSON_CMAKE_FLAG_BUILD_DIRS ${JSON_CMAKE_FLAG_BUILD_DIRS} PARENT_SCOPE)
 endfunction()
 
-foreach(JSON_CMAKE_FLAG ${JSON_CMAKE_FLAGS_3_1_0})
-    ci_add_cmake_flags_targets(${JSON_CMAKE_FLAG} 3.1.0)
+foreach(JSON_CMAKE_FLAG ${JSON_CMAKE_FLAGS_3_5_0})
+    ci_add_cmake_flags_targets(${JSON_CMAKE_FLAG} 3.5.0)
 endforeach()
 
-foreach(JSON_CMAKE_FLAG ${JSON_CMAKE_FLAGS_3_13_0})
-    ci_add_cmake_flags_targets(${JSON_CMAKE_FLAG} 3.13.0)
+foreach(JSON_CMAKE_FLAG ${JSON_CMAKE_FLAGS_3_31_6})
+    ci_add_cmake_flags_targets(${JSON_CMAKE_FLAG} 3.31.6)
+endforeach()
+
+foreach(JSON_CMAKE_FLAG ${JSON_CMAKE_FLAGS_4_0_0})
+    ci_add_cmake_flags_targets(${JSON_CMAKE_FLAG} 4.0.0)
 endforeach()
 
 add_custom_target(ci_cmake_flags
@@ -905,15 +617,10 @@ add_custom_target(ci_cmake_flags
 # Use more installed compilers.
 ###############################################################################
 
-foreach(COMPILER g++-4.8 g++-4.9 g++-5 g++-6 g++-7 g++-8 g++-9 g++-10 g++-11 clang++-3.5 clang++-3.6 clang++-3.7 clang++-3.8 clang++-3.9 clang++-4.0 clang++-5.0 clang++-6.0 clang++-7 clang++-8 clang++-9 clang++-10 clang++-11 clang++-12 clang++-13 clang++-14)
+foreach(COMPILER g++-4.8 g++-4.9 g++-5 g++-6 g++-7 g++-8 g++-9 g++-10 g++-11 clang++-3.5 clang++-3.6 clang++-3.7 clang++-3.8 clang++-3.9 clang++-4.0 clang++-5.0 clang++-6.0 clang++-7 clang++-8 clang++-9 clang++-10 clang++-11 clang++-12 clang++-13 clang++-14 clang++-15 clang++-16 clang++-17 clang++-18 clang++-19 clang++-20)
     find_program(COMPILER_TOOL NAMES ${COMPILER})
     if (COMPILER_TOOL)
-        if ("${COMPILER}" STREQUAL "clang++-9")
-            # fix for https://github.com/nlohmann/json/pull/3101#issuecomment-998788786 / https://stackoverflow.com/a/64051725/266378
-            set(ADDITIONAL_FLAGS "-DCMAKE_CXX_FLAGS=--gcc-toolchain=/root/gcc/9")
-        else()
-            unset(ADDITIONAL_FLAGS)
-        endif()
+        unset(ADDITIONAL_FLAGS)
 
         add_custom_target(ci_test_compiler_${COMPILER}
             COMMAND CXX=${COMPILER} ${CMAKE_COMMAND}
@@ -929,6 +636,17 @@ foreach(COMPILER g++-4.8 g++-4.9 g++-5 g++-6 g++-7 g++-8 g++-9 g++-10 g++-11 cla
     unset(COMPILER_TOOL CACHE)
 endforeach()
 
+add_custom_target(ci_test_compiler_default
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_FastTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_compiler_default
+        ${ADDITIONAL_FLAGS}
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_compiler_default --parallel ${N}
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_compiler_default && ${CMAKE_CTEST_COMMAND} --parallel ${N} --exclude-regex "test-unicode" -LE git_required --output-on-failure
+    COMMENT "Compile and test with default C++ compiler"
+)
+
 ###############################################################################
 # CUDA example
 ###############################################################################
@@ -941,6 +659,18 @@ add_custom_target(ci_cuda_example
     COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_cuda_example
 )
 
+###############################################################################
+# C++ 20 modules
+###############################################################################
+
+add_custom_target(ci_module_cpp20
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja 
+        -DJSON_CI=ON -DNLOHMANN_JSON_BUILD_MODULES=ON -DJSON_Install=ON
+        -S${PROJECT_SOURCE_DIR}/tests/module_cpp20 -B${PROJECT_BINARY_DIR}/ci_module_cpp20
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/ci_module_cpp20
+)
+
 ###############################################################################
 # Intel C++ Compiler
 ###############################################################################
@@ -956,6 +686,17 @@ add_custom_target(ci_icpc
     COMMENT "Compile and test with ICPC"
 )
 
+###############################################################################
+# REUSE
+###############################################################################
+
+add_custom_target(ci_reuse_compliance
+    COMMAND ${Python3_EXECUTABLE} -mvenv venv_reuse
+    COMMAND venv_reuse/bin/pip3 --quiet install -r ${PROJECT_SOURCE_DIR}/cmake/requirements/requirements-reuse.txt
+    COMMAND venv_reuse/bin/reuse --root ${PROJECT_SOURCE_DIR} lint
+    COMMENT "Check REUSE specification compliance"
+)
+
 ###############################################################################
 # test documentation
 ###############################################################################
@@ -966,10 +707,12 @@ add_custom_target(ci_test_examples
     COMMENT "Check that all examples compile and create the desired output"
 )
 
-add_custom_target(ci_test_api_documentation
-    COMMAND ${Python3_EXECUTABLE} scripts/check_structure.py
+add_custom_target(ci_test_build_documentation
+    COMMAND ${Python3_EXECUTABLE} -mvenv venv
+    COMMAND venv/bin/pip3 --quiet install -r requirements.txt
+    COMMAND make build
     WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/docs/mkdocs
-    COMMENT "Lint the API documentation"
+    COMMENT "Build the documentation"
 )
 
 ###############################################################################
@@ -977,6 +720,6 @@ add_custom_target(ci_test_api_documentation
 ###############################################################################
 
 add_custom_target(ci_clean
-    COMMAND rm -fr ${PROJECT_BINARY_DIR}/build_* cmake-3.1.0-Darwin64 ${JSON_CMAKE_FLAG_BUILD_DIRS} ${single_binaries}
+    COMMAND rm -fr ${PROJECT_BINARY_DIR}/build_* cmake-3.5.0-Darwin64 ${JSON_CMAKE_FLAG_BUILD_DIRS} ${single_binaries}
     COMMENT "Clean generated directories"
 )

cmake/clang_flags.cmake

@@ -0,0 +1,22 @@
+# Ignored Clang warnings:
+# -Wno-c++98-compat               The library targets C++11.
+# -Wno-c++98-compat-pedantic      The library targets C++11.
+# -Wno-deprecated-declarations    The library contains annotations for deprecated functions.
+# -Wno-extra-semi-stmt            The library uses assert which triggers this warning.
+# -Wno-padded                     We do not care about padding warnings.
+# -Wno-covered-switch-default     All switches list all cases and a default case.
+# -Wno-unsafe-buffer-usage        Otherwise Doctest would not compile.
+# -Wno-missing-noreturn           We found no way to silence this warning otherwise, see PR #4871
+
+set(CLANG_CXXFLAGS
+    -Werror
+    -Weverything
+    -Wno-c++98-compat
+    -Wno-c++98-compat-pedantic
+    -Wno-deprecated-declarations
+    -Wno-extra-semi-stmt
+    -Wno-padded
+    -Wno-covered-switch-default
+    -Wno-unsafe-buffer-usage
+    -Wno-missing-noreturn
+)

cmake/detect_libcpp_version.cpp

@@ -0,0 +1,31 @@
+/*
+ * Detect used C++ Standard Library
+ *
+ * This file is compiled and run via try_run in download_test_data.cmake.
+ */
+
+#include <cstdio>
+
+// see https://en.cppreference.com/w/cpp/header/ciso646
+#if __cplusplus >= 202002L
+    #include <version>
+#else
+    #include <ciso646>
+#endif
+
+int main()
+{
+#if defined(_LIBCPP_VERSION)
+    std::printf("LLVM C++ Standard Library (libc++), _LIBCPP_VERSION=%d", _LIBCPP_VERSION);
+#elif defined(__GLIBCXX__)
+    std::printf("GNU C++ Standard Library (libstdc++), __GLIBCXX__=%d", __GLIBCXX__);
+#elif defined(_MSVC_STL_VERSION)
+    std::printf("Microsoft C++ Standard Library (MSVC STL), _MSVC_STL_VERSION=%d", _MSVC_STL_VERSION);
+#elif defined(_LIBCUDACXX_VERSION)
+    std::printf("NVIDIA C++ Standard Library (libcudacxx), _LIBCUDACXX_VERSION=%d", _LIBCUDACXX_VERSION);
+#elif defined(EASTL_VERSION)
+    std::printf("Electronic Arts Standard Template Library (EASTL), EASTL_VERSION=%d", EASTL_VERSION);
+#else
+    std::printf("unknown");
+#endif
+}

cmake/download_test_data.cmake

@@ -1,21 +1,33 @@
 set(JSON_TEST_DATA_URL     https://github.com/nlohmann/json_test_data)
 set(JSON_TEST_DATA_VERSION 3.1.0)
 
+include(ExternalProject)
+
 # if variable is set, use test data from given directory rather than downloading them
 if(JSON_TestDataDirectory)
     message(STATUS "Using test data in ${JSON_TestDataDirectory}.")
     add_custom_target(download_test_data)
     file(WRITE ${CMAKE_BINARY_DIR}/include/test_data.hpp "#define TEST_DATA_DIRECTORY \"${JSON_TestDataDirectory}\"\n")
 else()
-    find_package(Git)
+    # create a header with the path to the downloaded test data
+    file(WRITE ${CMAKE_BINARY_DIR}/include/test_data.hpp "#define TEST_DATA_DIRECTORY \"${CMAKE_BINARY_DIR}/test_files\"\n")
+
+    # download test data from GitHub release
+    ExternalProject_Add(download_test_data_project
+        URL "${JSON_TEST_DATA_URL}/archive/refs/tags/v${JSON_TEST_DATA_VERSION}.zip"
+        SOURCE_DIR "${CMAKE_BINARY_DIR}/test_files"
+        CONFIGURE_COMMAND ""
+        BUILD_COMMAND ""
+        INSTALL_COMMAND ""
+        LOG_DOWNLOAD TRUE
+        DOWNLOAD_EXTRACT_TIMESTAMP TRUE
+        EXCLUDE_FROM_ALL TRUE
+    )
+
     # target to download test data
     add_custom_target(download_test_data
-        COMMAND test -d json_test_data || ${GIT_EXECUTABLE} clone -c advice.detachedHead=false --branch v${JSON_TEST_DATA_VERSION} ${JSON_TEST_DATA_URL}.git --quiet --depth 1
-        COMMENT "Downloading test data from ${JSON_TEST_DATA_URL} (v${JSON_TEST_DATA_VERSION})"
-        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+        DEPENDS download_test_data_project
     )
-    # create a header with the path to the downloaded test data
-    file(WRITE ${CMAKE_BINARY_DIR}/include/test_data.hpp "#define TEST_DATA_DIRECTORY \"${CMAKE_BINARY_DIR}/json_test_data\"\n")
 endif()
 
 # determine the operating system (for debug and support purposes)
@@ -54,3 +66,22 @@ else()
 endif()
 string(REGEX REPLACE "[ ]*\n" "; " CXX_VERSION_RESULT "${CXX_VERSION_RESULT}")
 message(STATUS "Compiler: ${CXX_VERSION_RESULT}")
+
+# determine used C++ standard library (for debug and support purposes)
+if(CMAKE_CROSSCOMPILING)
+    set(LIBCPP_VERSION_OUTPUT_CACHED "could not be detected due to cross-compiling" CACHE STRING "Detected C++ standard library version")
+endif()
+if(NOT DEFINED LIBCPP_VERSION_OUTPUT_CACHED)
+    try_run(RUN_RESULT_VAR COMPILE_RESULT_VAR
+        "${CMAKE_BINARY_DIR}" SOURCES "${CMAKE_SOURCE_DIR}/cmake/detect_libcpp_version.cpp"
+        RUN_OUTPUT_VARIABLE LIBCPP_VERSION_OUTPUT
+        COMPILE_OUTPUT_VARIABLE LIBCPP_VERSION_COMPILE_OUTPUT
+    )
+    if(NOT LIBCPP_VERSION_OUTPUT)
+        set(LIBCPP_VERSION_OUTPUT "Unknown")
+        message(AUTHOR_WARNING "Failed to compile cmake/detect_libcpp_version to detect the used C++ standard library. This does not affect the library or the test cases. Please still create an issue at https://github.com/nlohmann/json to investigate this.\n${LIBCPP_VERSION_COMPILE_OUTPUT}")
+    endif()
+    set(LIBCPP_VERSION_OUTPUT_CACHED "${LIBCPP_VERSION_OUTPUT}" CACHE STRING "Detected C++ standard library version")
+endif()
+
+message(STATUS "C++ standard library: ${LIBCPP_VERSION_OUTPUT_CACHED}")

cmake/gcc_flags.cmake

@@ -0,0 +1,363 @@
+# Warning flags determined for GCC 15.1.0 with https://github.com/nlohmann/gcc_flags:
+# Ignored GCC warnings:
+# -Wno-abi-tag           We do not care about ABI tags.
+# -Wno-aggregate-return  The library uses aggregate returns.
+# -Wno-long-long         The library uses the long long type to interface with system functions.
+# -Wno-namespaces        The library uses namespaces.
+# -Wno-nrvo              Doctest triggers this warning.
+# -Wno-padded            We do not care about padding warnings.
+# -Wno-system-headers    We do not care about warnings in system headers.
+# -Wno-templates         The library uses templates.
+
+set(GCC_CXXFLAGS
+    -pedantic
+    -Werror
+    --all-warnings
+    --extra-warnings
+    -W
+    -WNSObject-attribute
+    -Wno-abi-tag
+    -Waddress
+    -Waddress-of-packed-member
+    -Wno-aggregate-return
+    -Waggressive-loop-optimizations
+    -Waligned-new=all
+    -Wall
+    -Walloc-size
+    -Walloc-zero
+    -Walloca
+    -Wanalyzer-allocation-size
+    -Wanalyzer-deref-before-check
+    -Wanalyzer-double-fclose
+    -Wanalyzer-double-free
+    -Wanalyzer-exposure-through-output-file
+    -Wanalyzer-exposure-through-uninit-copy
+    -Wanalyzer-fd-access-mode-mismatch
+    -Wanalyzer-fd-double-close
+    -Wanalyzer-fd-leak
+    -Wanalyzer-fd-phase-mismatch
+    -Wanalyzer-fd-type-mismatch
+    -Wanalyzer-fd-use-after-close
+    -Wanalyzer-fd-use-without-check
+    -Wanalyzer-file-leak
+    -Wanalyzer-free-of-non-heap
+    -Wanalyzer-imprecise-fp-arithmetic
+    -Wanalyzer-infinite-loop
+    -Wanalyzer-infinite-recursion
+    -Wanalyzer-jump-through-null
+    -Wanalyzer-malloc-leak
+    -Wanalyzer-mismatching-deallocation
+    -Wanalyzer-null-argument
+    -Wanalyzer-null-dereference
+    -Wanalyzer-out-of-bounds
+    -Wanalyzer-overlapping-buffers
+    -Wanalyzer-possible-null-argument
+    -Wanalyzer-possible-null-dereference
+    -Wanalyzer-putenv-of-auto-var
+    -Wanalyzer-shift-count-negative
+    -Wanalyzer-shift-count-overflow
+    -Wanalyzer-stale-setjmp-buffer
+    -Wanalyzer-symbol-too-complex
+    -Wanalyzer-tainted-allocation-size
+    -Wanalyzer-tainted-array-index
+    -Wanalyzer-tainted-assertion
+    -Wanalyzer-tainted-divisor
+    -Wanalyzer-tainted-offset
+    -Wanalyzer-tainted-size
+    -Wanalyzer-too-complex
+    -Wanalyzer-undefined-behavior-ptrdiff
+    -Wanalyzer-undefined-behavior-strtok
+    -Wanalyzer-unsafe-call-within-signal-handler
+    -Wanalyzer-use-after-free
+    -Wanalyzer-use-of-pointer-in-stale-stack-frame
+    -Wanalyzer-use-of-uninitialized-value
+    -Wanalyzer-va-arg-type-mismatch
+    -Wanalyzer-va-list-exhausted
+    -Wanalyzer-va-list-leak
+    -Wanalyzer-va-list-use-after-va-end
+    -Wanalyzer-write-to-const
+    -Wanalyzer-write-to-string-literal
+    -Warith-conversion
+    -Warray-bounds=2
+    -Warray-compare
+    -Warray-parameter=2
+    -Wattribute-alias=2
+    -Wattribute-warning
+    -Wattributes
+    -Wbool-compare
+    -Wbool-operation
+    -Wbuiltin-declaration-mismatch
+    -Wbuiltin-macro-redefined
+    -Wc++0x-compat
+    -Wc++11-compat
+    -Wc++11-extensions
+    -Wc++14-compat
+    -Wc++14-extensions
+    -Wc++17-compat
+    -Wc++17-extensions
+    -Wc++1z-compat
+    -Wc++20-compat
+    -Wc++20-extensions
+    -Wc++23-extensions
+    -Wc++26-extensions
+    -Wc++2a-compat
+    -Wcalloc-transposed-args
+    -Wcannot-profile
+    -Wcast-align
+    -Wcast-align=strict
+    -Wcast-function-type
+    -Wcast-qual
+    -Wcast-user-defined
+    -Wcatch-value=3
+    -Wchanges-meaning
+    -Wchar-subscripts
+    -Wclass-conversion
+    -Wclass-memaccess
+    -Wclobbered
+    -Wcomma-subscript
+    -Wcomment
+    -Wcomments
+    -Wcomplain-wrong-lang
+    -Wconditionally-supported
+    -Wconversion
+    -Wconversion-null
+    -Wcoverage-invalid-line-number
+    -Wcoverage-mismatch
+    -Wcoverage-too-many-conditions
+    -Wcoverage-too-many-paths
+    -Wcpp
+    -Wctad-maybe-unsupported
+    -Wctor-dtor-privacy
+    -Wdangling-else
+    -Wdangling-pointer=2
+    -Wdangling-reference
+    -Wdate-time
+    -Wdefaulted-function-deleted
+    -Wdelete-incomplete
+    -Wdelete-non-virtual-dtor
+    -Wdeprecated
+    -Wdeprecated-copy
+    -Wdeprecated-copy-dtor
+    -Wdeprecated-declarations
+    -Wdeprecated-enum-enum-conversion
+    -Wdeprecated-enum-float-conversion
+    -Wdeprecated-literal-operator
+    -Wdeprecated-variadic-comma-omission
+    -Wdisabled-optimization
+    -Wdiv-by-zero
+    -Wdouble-promotion
+    -Wduplicated-branches
+    -Wduplicated-cond
+    -Weffc++
+    -Welaborated-enum-base
+    -Wempty-body
+    -Wendif-labels
+    -Wenum-compare
+    -Wenum-conversion
+    -Wexceptions
+    -Wexpansion-to-defined
+    -Wextra
+    -Wextra-semi
+    -Wflex-array-member-not-at-end
+    -Wfloat-conversion
+    -Wfloat-equal
+    -Wformat -Wformat-contains-nul
+    -Wformat -Wformat-diag
+    -Wformat -Wformat-extra-args
+    -Wformat -Wformat-nonliteral
+    -Wformat -Wformat-overflow=2
+    -Wformat -Wformat-security
+    -Wformat -Wformat-signedness
+    -Wformat -Wformat-truncation=2
+    -Wformat -Wformat-y2k
+    -Wformat -Wformat-zero-length
+    -Wformat=2
+    -Wframe-address
+    -Wfree-nonheap-object
+    -Wglobal-module
+    -Whardened
+    -Wheader-guard
+    -Whsa
+    -Wif-not-aligned
+    -Wignored-attributes
+    -Wignored-qualifiers
+    -Wimplicit-fallthrough=5
+    -Winaccessible-base
+    -Winfinite-recursion
+    -Winherited-variadic-ctor
+    -Winit-list-lifetime
+    -Winit-self
+    -Winline
+    -Wint-in-bool-context
+    -Wint-to-pointer-cast
+    -Winterference-size
+    -Winvalid-constexpr
+    -Winvalid-imported-macros
+    -Winvalid-memory-model
+    -Winvalid-offsetof
+    -Winvalid-pch
+    -Winvalid-utf8
+    -Wliteral-suffix
+    -Wlogical-not-parentheses
+    -Wlogical-op
+    -Wno-long-long
+    -Wlto-type-mismatch
+    -Wmain
+    -Wmaybe-musttail-local-addr
+    -Wmaybe-uninitialized
+    -Wmemset-elt-size
+    -Wmemset-transposed-args
+    -Wmisleading-indentation
+    -Wmismatched-dealloc
+    -Wmismatched-new-delete
+    -Wmismatched-tags
+    -Wmissing-attributes
+    -Wmissing-braces
+    -Wmissing-declarations
+    -Wmissing-field-initializers
+    -Wmissing-include-dirs
+    -Wmissing-profile
+    -Wmissing-requires
+    -Wmissing-template-keyword
+    -Wmultichar
+    -Wmultiple-inheritance
+    -Wmultistatement-macros
+    -Wmusttail-local-addr
+    -Wno-namespaces
+    -Wnarrowing
+    -Wnoexcept
+    -Wnoexcept-type
+    -Wnon-template-friend
+    -Wnon-virtual-dtor
+    -Wnonnull
+    -Wnonnull-compare
+    -Wnormalized=nfkc
+    -Wno-nrvo
+    -Wnull-dereference
+    -Wodr
+    -Wold-style-cast
+    -Wopenacc-parallelism
+    -Wopenmp
+    -Wopenmp-simd
+    -Woverflow
+    -Woverlength-strings
+    -Woverloaded-virtual=2
+    -Wpacked
+    -Wpacked-bitfield-compat
+    -Wpacked-not-aligned
+    -Wno-padded
+    -Wparentheses
+    -Wpedantic
+    -Wpessimizing-move
+    -Wplacement-new=2
+    -Wpmf-conversions
+    -Wpointer-arith
+    -Wpointer-compare
+    -Wpragma-once-outside-header
+    -Wpragmas
+    -Wprio-ctor-dtor
+    -Wpsabi
+    -Wrange-loop-construct
+    -Wredundant-decls
+    -Wredundant-move
+    -Wredundant-tags
+    -Wregister
+    -Wreorder
+    -Wrestrict
+    -Wreturn-local-addr
+    -Wreturn-type
+    -Wscalar-storage-order
+    -Wself-move
+    -Wsequence-point
+    -Wshadow=compatible-local
+    -Wshadow=global
+    -Wshadow=local
+    -Wshift-count-negative
+    -Wshift-count-overflow
+    -Wshift-negative-value
+    -Wshift-overflow=2
+    -Wsign-compare
+    -Wsign-conversion
+    -Wsign-promo
+    -Wsized-deallocation
+    -Wsizeof-array-argument
+    -Wsizeof-array-div
+    -Wsizeof-pointer-div
+    -Wsizeof-pointer-memaccess
+    -Wstack-protector
+    -Wstrict-aliasing
+    -Wstrict-aliasing=3
+    -Wstrict-null-sentinel
+    -Wstrict-overflow
+    -Wstring-compare
+    -Wstringop-overflow
+    -Wstringop-overflow=4
+    -Wstringop-overread
+    -Wstringop-truncation
+    -Wsubobject-linkage
+    -Wsuggest-attribute=cold
+    -Wsuggest-attribute=const
+    -Wsuggest-attribute=format
+    -Wsuggest-attribute=malloc
+    -Wsuggest-attribute=noreturn
+    -Wsuggest-attribute=pure
+    -Wsuggest-attribute=returns_nonnull
+    -Wsuggest-final-methods
+    -Wsuggest-final-types
+    -Wsuggest-override
+    -Wswitch
+    -Wswitch-bool
+    -Wswitch-default
+    -Wswitch-enum
+    -Wswitch-outside-range
+    -Wswitch-unreachable
+    -Wsync-nand
+    -Wsynth
+    -Wno-system-headers
+    -Wtautological-compare
+    -Wtemplate-body
+    -Wtemplate-id-cdtor
+    -Wtemplate-names-tu-local
+    -Wno-templates
+    -Wterminate
+    -Wtrailing-whitespace
+    -Wtrampolines
+    -Wtrigraphs
+    -Wtrivial-auto-var-init
+    -Wtsan
+    -Wtype-limits
+    -Wundef
+    -Wunicode
+    -Wuninitialized
+    -Wunknown-pragmas
+    -Wunreachable-code
+    -Wunsafe-loop-optimizations
+    -Wunused
+    -Wunused-but-set-parameter
+    -Wunused-but-set-variable
+    -Wunused-const-variable=2
+    -Wunused-function
+    -Wunused-label
+    -Wunused-local-typedefs
+    -Wunused-macros
+    -Wunused-parameter
+    -Wunused-result
+    -Wunused-value
+    -Wunused-variable
+    -Wuse-after-free=3
+    -Wuseless-cast
+    -Wvarargs
+    -Wvariadic-macros
+    -Wvector-operation-performance
+    -Wvexing-parse
+    -Wvirtual-inheritance
+    -Wvirtual-move-assign
+    -Wvla
+    -Wvla-parameter
+    -Wvolatile
+    -Wvolatile-register-var
+    -Wwrite-strings
+    -Wxor-used-as-pow
+    -Wzero-as-null-pointer-constant
+    -Wzero-length-bounds
+)

cmake/pkg-config.pc.in

@@ -1,4 +1,7 @@
-Name: ${PROJECT_NAME}
+prefix=@CMAKE_INSTALL_PREFIX@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
+
+Name: @PROJECT_NAME@
 Description: JSON for Modern C++
-Version: ${PROJECT_VERSION}
-Cflags: -I${CMAKE_INSTALL_FULL_INCLUDEDIR}
+Version: @PROJECT_VERSION@
+Cflags: -I${includedir}

cmake/requirements/requirements-cppcheck.txt

@@ -0,0 +1 @@
+cppcheck==1.5.0

cmake/requirements/requirements-cpplint.txt

@@ -0,0 +1 @@
+cpplint==2.0.2

cmake/requirements/requirements-reuse.txt

@@ -0,0 +1 @@
+reuse==6.2.0

cmake/scripts/gen_bazel_build_file.cmake

@@ -0,0 +1,24 @@
+# generate Bazel BUILD file
+
+set(PROJECT_ROOT "${CMAKE_CURRENT_LIST_DIR}/../..")
+set(BUILD_FILE "${PROJECT_ROOT}/BUILD.bazel")
+
+file(GLOB_RECURSE HEADERS LIST_DIRECTORIES false RELATIVE "${PROJECT_ROOT}" "include/*.hpp")
+
+file(WRITE "${BUILD_FILE}" [=[
+cc_library(
+    name = "json",
+    hdrs = [
+]=])
+
+foreach(header ${HEADERS})
+    file(APPEND "${BUILD_FILE}" "        \"${header}\",\n")
+endforeach()
+
+file(APPEND "${BUILD_FILE}" [=[
+    ],
+    includes = ["include"],
+    visibility = ["//visibility:public"],
+    alwayslink = True,
+)
+]=])

cmake/test.cmake

@@ -259,7 +259,7 @@ function(json_test_should_build_32bit_test build_32bit_var build_32bit_only_var
         # check if compiler is targeting 32bit by default
         include(CheckTypeSize)
         check_type_size("size_t" sizeof_size_t LANGUAGE CXX)
-        if(sizeof_size_t AND ${sizeof_size_t} EQUAL 4)
+        if(${sizeof_size_t} AND ${sizeof_size_t} EQUAL 4)
             message(STATUS "Auto-enabling 32bit unit test.")
             set(${build_32bit_var} ON)
         else()

docs/Makefile

@@ -7,7 +7,7 @@ all: create_output
 ##########################################################################
 
 # where are the example cpp files
-EXAMPLES = $(wildcard examples/*.cpp)
+EXAMPLES = $(wildcard mkdocs/docs/examples/*.cpp)
 
 cxx_standard = $(lastword c++11 $(filter c++%, $(subst ., ,$1)))
 
@@ -37,9 +37,8 @@ check_output: $(EXAMPLES:.cpp=.test)
 
 # check output of all stand-alone example files (exclude files with platform-dependent output.)
 # This target is used in the CI (ci_test_documentation).
-check_output_portable: $(filter-out examples/meta.test examples/max_size.test examples/std_hash.test examples/basic_json__CompatibleType.test,$(EXAMPLES:.cpp=.test))
+check_output_portable: $(filter-out mkdocs/docs/examples/meta.test mkdocs/docs/examples/max_size.test mkdocs/docs/examples/std_hash.test mkdocs/docs/examples/basic_json__CompatibleType.test,$(EXAMPLES:.cpp=.test))
 
 clean:
 	rm -fr $(EXAMPLES:.cpp=)
 	$(MAKE) clean -C docset
-	$(MAKE) clean -C mkdocs

docs/README.md

@@ -2,12 +2,12 @@
 
 ## Generate documentation
 
-Note on documentation: The source files contain links to the online documentation at https://json.nlohmann.me. This URL
-contains the most recent documentation and should also be applicable to previous versions; documentation for deprecated
-functions is not removed, but marked deprecated.
+Note on documentation: The source files contain links to the online documentation at https://json.nlohmann.me.  
+This URL provides the most recent documentation and also applies to previous versions. Documentation for deprecated
+functions is not removed; instead, it is marked as deprecated.
 
-If you want to see the documentation for a specific tag or commit hash, you can generate it as follows (here for tag
-`v3.10.2`):
+If you want to view the documentation for a specific tag or commit hash, you can generate it locally as follows (example
+using tag `v3.10.2`):
 
 ```shell
 git clone https://github.com/nlohmann/json.git
@@ -16,5 +16,8 @@ git checkout v3.10.2
 make install_venv serve -C docs/mkdocs
 ```
 
-Open URL <http://127.0.0.1:8000/> in your browser. Replace from any URL from the source code `https://json.nlohmann.me`
-with `http://127.0.0.1:8000` to see the documentation for your tag or commit hash.
+Open <http://127.0.0.1:8000/> in your browser. Replace any URL in the source code that points to
+`https://json.nlohmann.me` with `http://127.0.0.1:8000` to view the documentation for the selected tag or commit hash.
+
+
+

docs/docset/Makefile

@@ -16,6 +16,7 @@ JSON_for_Modern_C++.docset: Info.plist docSet.dsidx
 	cp icon*.png JSON_for_Modern_C++.docset
 	cp Info.plist JSON_for_Modern_C++.docset/Contents
 	# build and copy documentation
+	$(MAKE) install_venv -C ../mkdocs
 	$(MAKE) build -C ../mkdocs
 	cp -r ../mkdocs/site/* JSON_for_Modern_C++.docset/Contents/Resources/Documents
 	# patch CSS to hide navigation items

docs/docset/docSet.sql

@@ -38,6 +38,7 @@ INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::emplace', 'Method
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::emplace_back', 'Method', 'api/basic_json/emplace_back/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::empty', 'Method', 'api/basic_json/empty/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::end', 'Method', 'api/basic_json/end/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::end_pos', 'Method', 'api/basic_json/end_pos/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::erase', 'Method', 'api/basic_json/erase/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::error_handler_t', 'Enum', 'api/basic_json/error_handler_t/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::exception', 'Class', 'api/basic_json/exception/index.html');
@@ -72,6 +73,7 @@ INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::is_primitive', 'M
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::is_string', 'Method', 'api/basic_json/is_string/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::is_structured', 'Method', 'api/basic_json/is_structured/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::items', 'Method', 'api/basic_json/items/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::json_base_class_t', 'Type', 'api/basic_json/json_base_class_t/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::json_serializer', 'Class', 'api/basic_json/json_serializer/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::max_size', 'Method', 'api/basic_json/max_size/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::merge_patch', 'Method', 'api/basic_json/merge_patch/index.html');
@@ -107,6 +109,7 @@ INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::rbegin', 'Method'
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::rend', 'Method', 'api/basic_json/rend/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::sax_parse', 'Function', 'api/basic_json/sax_parse/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::size', 'Method', 'api/basic_json/size/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::start_pos', 'Method', 'api/basic_json/start_pos/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::string_t', 'Type', 'api/basic_json/string_t/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::swap', 'Method', 'api/basic_json/swap/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::type', 'Method', 'api/basic_json/type/index.html');
@@ -175,6 +178,8 @@ INSERT INTO searchIndex(name, type, path) VALUES ('Element Access', 'Guide', 'fe
 INSERT INTO searchIndex(name, type, path) VALUES ('Element Access: Access with default value: value', 'Guide', 'features/element_access/default_value/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('Element Access: Checked access: at', 'Guide', 'features/element_access/checked_access/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('Element Access: Unchecked access: operator[]', 'Guide', 'features/element_access/unchecked_access/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('Exceptions', 'Guide', 'home/exceptions/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('Integration: Migration Guide', 'Guide', 'integration/migration_guide/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('Integration: CMake', 'Guide', 'integration/cmake/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('Integration: Header only', 'Guide', 'integration/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('Integration: Package Managers', 'Guide', 'integration/package_managers/index.html');
@@ -200,6 +205,7 @@ INSERT INTO searchIndex(name, type, path) VALUES ('Supported Macros', 'Guide', '
 INSERT INTO searchIndex(name, type, path) VALUES ('JSON_ASSERT', 'Macro', 'api/macros/json_assert/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('JSON_CATCH_USER', 'Macro', 'api/macros/json_throw_user/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('JSON_DIAGNOSTICS', 'Macro', 'api/macros/json_diagnostics/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON_DIAGNOSTIC_POSITIONS', 'Macro', 'api/macros/json_diagnostic_positions/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('JSON_DISABLE_ENUM_SERIALIZATION', 'Macro', 'api/macros/json_disable_enum_serialization/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('JSON_HAS_CPP_11', 'Macro', 'api/macros/json_has_cpp_11/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('JSON_HAS_CPP_14', 'Macro', 'api/macros/json_has_cpp_11/index.html');
@@ -208,6 +214,7 @@ INSERT INTO searchIndex(name, type, path) VALUES ('JSON_HAS_CPP_20', 'Macro', 'a
 INSERT INTO searchIndex(name, type, path) VALUES ('JSON_HAS_EXPERIMENTAL_FILESYSTEM', 'Macro', 'api/macros/json_has_filesystem/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('JSON_HAS_FILESYSTEM', 'Macro', 'api/macros/json_has_filesystem/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('JSON_HAS_RANGES', 'Macro', 'api/macros/json_has_ranges/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON_HAS_STATIC_RTTI', 'Macro', 'api/macros/json_has_static_rtti/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('JSON_HAS_THREE_WAY_COMPARISON', 'Macro', 'api/macros/json_has_three_way_comparison/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('JSON_NOEXCEPTION', 'Macro', 'api/macros/json_noexception/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('JSON_NO_IO', 'Macro', 'api/macros/json_no_io/index.html');
@@ -219,6 +226,10 @@ INSERT INTO searchIndex(name, type, path) VALUES ('JSON_USE_GLOBAL_UDLS', 'Macro
 INSERT INTO searchIndex(name, type, path) VALUES ('JSON_USE_IMPLICIT_CONVERSIONS', 'Macro', 'api/macros/json_use_implicit_conversions/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON', 'Macro', 'api/macros/json_use_legacy_discarded_value_comparison/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('Macros', 'Macro', 'api/macros/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE', 'Macro', 'api/macros/nlohmann_define_derived_type/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT', 'Macro', 'api/macros/nlohmann_define_derived_type/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE', 'Macro', 'api/macros/nlohmann_define_derived_type/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT', 'Macro', 'api/macros/nlohmann_define_derived_type/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('NLOHMANN_DEFINE_TYPE_INTRUSIVE', 'Macro', 'api/macros/nlohmann_define_type_intrusive/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT', 'Macro', 'api/macros/nlohmann_define_type_intrusive/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE', 'Macro', 'api/macros/nlohmann_define_type_non_intrusive/index.html');

docs/docset/docset.json

@@ -1,6 +1,6 @@
 {
   "name": "JSON for Modern C++",
-  "version": "3.11.2",
+  "version": "3.12.0",
   "archive": "JSON_for_Modern_C++.tgz",
   "author": {
     "name": "Niels Lohmann",

docs/examples/nlohmann_json_namespace.output

@@ -1 +0,0 @@
-nlohmann::json_abi_v3_11_2

docs/examples/nlohmann_json_version.output

@@ -1 +0,0 @@
-JSON for Modern C++ version 3.11.2

docs/mkdocs/Makefile

@@ -1,37 +1,45 @@
 # serve the site locally
-serve: prepare_files style_check
+serve: style_check
 	venv/bin/mkdocs serve
 
-serve_dirty: prepare_files style_check
+serve_dirty: style_check
 	venv/bin/mkdocs serve --dirtyreload
 
-build: prepare_files style_check
+# This target is used in the CI (ci_test_build_documentation).
+# This target is used by the docset Makefile.
+build: style_check
 	venv/bin/mkdocs build
 
-# create files that are not versioned inside the mkdocs folder (images, examples)
-prepare_files: clean
-	mkdir docs/examples
-	cp -r ../json.gif docs/images
-	cp -r ../examples/*.cpp ../examples/*.output docs/examples
-
 style_check:
-	@cd docs ; python3 ../scripts/check_structure.py
+	@cd docs ; ../venv/bin/python3 ../scripts/check_structure.py
 
-# clean subfolders
-clean:
-	rm -fr docs/images/json.gif docs/examples
+# check the links in the documentation files in docs/mkdocs
+link_check:
+	ENABLED_HTMLPROOFER=true venv/bin/mkdocs build
 
-# publish site to GitHub pages
-publish: prepare_files
+# check the links in all other Markdown files
+link_check_markdowns:
+	npx markdown-link-check --progress --alive 200,429 ../../README.md ../../FILES.md ../../.github/*.md
+
+# publish site to GitHub pages (not working in GitHub Actions; need special action)
+publish:
 	venv/bin/mkdocs gh-deploy --clean --force
 
 # install a Python virtual environment
+# This target is used by the docset Makefile.
 install_venv: requirements.txt
 	python3 -mvenv venv
 	venv/bin/pip install --upgrade pip
-	venv/bin/pip install wheel
 	venv/bin/pip install -r requirements.txt
 
 # uninstall the virtual environment
-uninstall_venv: clean
+uninstall_venv:
 	rm -fr venv
+
+update_requirements:
+	rm -fr venv_small
+	python3 -mvenv venv_small
+	venv_small/bin/pip3 install pur
+	venv_small/bin/pur -r requirements.txt
+	rm -fr venv_small venv
+	make install_venv

docs/mkdocs/docs/api/adl_serializer/from_json.md

@@ -14,7 +14,7 @@ noexcept(::nlohmann::from_json(std::forward<BasicJsonType>(j), detail::identity_
 -> decltype(::nlohmann::from_json(std::forward<BasicJsonType>(j), detail::identity_tag<TargetType> {}))
 ```
 
-This function is usually called by the [`get()`](../basic_json/get.md) function of the [basic_json](../basic_json)
+This function is usually called by the [`get()`](../basic_json/get.md) function of the [basic_json](../basic_json/index.md)
 class (either explicitly or via the conversion operators).
 
 1. This function is chosen for default-constructible value types.

docs/mkdocs/docs/api/adl_serializer/index.md

@@ -8,7 +8,7 @@ struct adl_serializer;
 Serializer that uses ADL ([Argument-Dependent Lookup](https://en.cppreference.com/w/cpp/language/adl)) to choose
 `to_json`/`from_json` functions from the types' namespaces.
 
-It is implemented similar to
+It is implemented similarly to
 
 ```cpp
 template<typename ValueType>

docs/mkdocs/docs/api/adl_serializer/to_json.md

@@ -7,7 +7,7 @@ static auto to_json(BasicJsonType& j, TargetType && val) noexcept(
 -> decltype(::nlohmann::to_json(j, std::forward<TargetType>(val)), void())
 ```
 
-This function is usually called by the constructors of the [basic_json](../basic_json) class.
+This function is usually called by the constructors of the [basic_json](../basic_json/index.md) class.
 
 ## Parameters
 

docs/mkdocs/docs/api/basic_json/accept.md

@@ -4,12 +4,14 @@
 // (1)
 template<typename InputType>
 static bool accept(InputType&& i,
-                   const bool ignore_comments = false);
+                   const bool ignore_comments = false,
+                   const bool ignore_trailing_commas = false);
 
 // (2)
 template<typename IteratorType>
 static bool accept(IteratorType first, IteratorType last,
-                   const bool ignore_comments = false);
+                   const bool ignore_comments = false,
+                   const bool ignore_trailing_commas = false);
 ```
 
 Checks whether the input is valid JSON.
@@ -17,10 +19,10 @@ Checks whether the input is valid JSON.
 1. Reads from a compatible input.
 2. Reads from a pair of character iterators
     
-    The value_type of the iterator must be an integral type with size of 1, 2 or 4 bytes, which will be interpreted
-    respectively as UTF-8, UTF-16 and UTF-32.
+    The value_type of the iterator must be an integral type with a size of 1, 2, or 4 bytes, which will be interpreted
+    respectively as UTF-8, UTF-16, and UTF-32.
     
-Unlike the [`parse`](parse.md) function, this function neither throws an exception in case of invalid JSON input
+Unlike the [`parse()`](parse.md) function, this function neither throws an exception in case of invalid JSON input
 (i.e., a parse error) nor creates diagnostic information.
 
 ## Template parameters
@@ -29,9 +31,9 @@ Unlike the [`parse`](parse.md) function, this function neither throws an excepti
 :   A compatible input, for instance:
     
     - an `std::istream` object
-    - a `FILE` pointer (must not be null)
+    - a `#!c FILE` pointer (throws if null)
     - a C-style array of characters
-    - a pointer to a null-terminated string of single byte characters
+    - a pointer to a null-terminated string of single byte characters (throws if null)
     - a `std::string`
     - an object `obj` for which `begin(obj)` and `end(obj)` produces a valid pair of iterators.
 
@@ -50,11 +52,15 @@ Unlike the [`parse`](parse.md) function, this function neither throws an excepti
 :   whether comments should be ignored and treated like whitespace (`#!cpp true`) or yield a parse error
     (`#!cpp false`); (optional, `#!cpp false` by default)
 
+`ignore_trailing_commas` (in)
+:   whether trailing commas in arrays or objects should be ignored and treated like whitespace (`#!cpp true`) or yield a parse error
+    (`#!cpp false`); (optional, `#!cpp false` by default)
+
 `first` (in)
-:   iterator to start of character range
+:   iterator to the start of the character range
 
 `last` (in)
-:   iterator to end of character range
+:   iterator to the end of the character range
 
 ## Return value
 
@@ -64,18 +70,17 @@ Whether the input is valid JSON.
 
 Strong guarantee: if an exception is thrown, there are no changes in the JSON value.
 
+## Exceptions
+
+Throws [`parse_error.101`](../../home/exceptions.md#jsonexceptionparse_error101) in case of an empty input like a null `#!c FILE*` or `#!c char*` pointer.
+
 ## Complexity
 
 Linear in the length of the input. The parser is a predictive LL(1) parser.
 
 ## Notes
 
-(1) A UTF-8 byte order mark is silently ignored.
-
-!!! danger "Runtime assertion"
-
-    The precondition that a passed `#!cpp FILE` pointer must not be null is enforced with a
-    [runtime assertion](../../features/assertions.md).
+A UTF-8 byte order mark is silently ignored.
 
 ## Examples
 
@@ -102,6 +107,8 @@ Linear in the length of the input. The parser is a predictive LL(1) parser.
 
 - Added in version 3.0.0.
 - Ignoring comments via `ignore_comments` added in version 3.9.0.
+- Changed [runtime assertion](../../features/assertions.md) in case of `FILE*` null pointers to exception in version 3.12.0.
+- Added `ignore_trailing_commas` in version 3.12.1.
 
 !!! warning "Deprecation"
 

docs/mkdocs/docs/api/basic_json/at.md

@@ -59,29 +59,29 @@ Strong exception safety: if an exception occurs, the original value stays intact
 
 1. The function can throw the following exceptions:
     - Throws [`type_error.304`](../../home/exceptions.md#jsonexceptiontype_error304) if the JSON value is not an array;
-      in this case, calling `at` with an index makes no sense. See example below.
+      in this case, calling `at` with an index makes no sense. See the example below.
     - Throws [`out_of_range.401`](../../home/exceptions.md#jsonexceptionout_of_range401) if the index `idx` is out of
-      range of the array; that is, `idx >= size()`. See example below.
+      range of the array; that is, `idx >= size()`. See the example below.
 2. The function can throw the following exceptions:
     - Throws [`type_error.304`](../../home/exceptions.md#jsonexceptiontype_error304) if the JSON value is not an object;
-      in this case, calling `at` with a key makes no sense. See example below.
+      in this case, calling `at` with a key makes no sense. See the example below.
     - Throws [`out_of_range.403`](../../home/exceptions.md#jsonexceptionout_of_range403) if the key `key` is not
-      stored in the object; that is, `find(key) == end()`. See example below.
+      stored in the object; that is, `find(key) == end()`. See the example below.
 3. See 2.
 4. The function can throw the following exceptions:
     - Throws [`parse_error.106`](../../home/exceptions.md#jsonexceptionparse_error106) if an array index in the passed
-      JSON pointer `ptr` begins with '0'. See example below.
+      JSON pointer `ptr` begins with '0'. See the example below.
     - Throws [`parse_error.109`](../../home/exceptions.md#jsonexceptionparse_error109) if an array index in the passed
-      JSON pointer `ptr` is not a number. See example below.
+      JSON pointer `ptr` is not a number. See the example below.
     - Throws [`out_of_range.401`](../../home/exceptions.md#jsonexceptionout_of_range401) if an array index in the passed
-      JSON pointer `ptr` is out of range. See example below.
+      JSON pointer `ptr` is out of range. See the example below.
     - Throws [`out_of_range.402`](../../home/exceptions.md#jsonexceptionout_of_range402) if the array index '-' is used
       in the passed JSON pointer `ptr`. As `at` provides checked access (and no elements are implicitly inserted), the
-      index '-' is always invalid. See example below.
+      index '-' is always invalid. See the example below.
     - Throws [`out_of_range.403`](../../home/exceptions.md#jsonexceptionout_of_range403) if the JSON pointer describes a
-      key of an object which cannot be found. See example below.
+      key of an object which cannot be found. See the example below.
     - Throws [`out_of_range.404`](../../home/exceptions.md#jsonexceptionout_of_range404) if the JSON pointer `ptr` can
-      not be resolved. See example below.
+      not be resolved. See the example below.
 
 ## Complexity
 
@@ -215,8 +215,8 @@ Strong exception safety: if an exception occurs, the original value stays intact
 ## See also
 
 - documentation on [checked access](../../features/element_access/checked_access.md)
-- see [`operator[]`](operator%5B%5D.md) for unchecked access by reference
-- see [`value`](value.md) for access with default value
+- [`operator[]`](operator%5B%5D.md) for unchecked access by reference
+- [`value`](value.md) for access with default value
 
 ## Version history
 

docs/mkdocs/docs/api/basic_json/back.md

@@ -17,8 +17,8 @@ return *tmp;
     
 ## Return value
 
-In case of a structured type (array or object), a reference to the last element is returned. In case of number, string,
-boolean, or binary values, a reference to the value is returned.
+In the case of a structured type (array or object), a reference to the last element is returned. In the case of number,
+string, boolean, or binary values, a reference to the value is returned.
 
 ## Exception safety
 

docs/mkdocs/docs/api/basic_json/basic_json.md

@@ -74,7 +74,7 @@ basic_json(basic_json&& other) noexcept;
     - **boolean**: `boolean_t` / `bool` can be used.
     - **binary**: `binary_t` / `std::vector<uint8_t>` may be used; unfortunately because string literals cannot be
      distinguished from binary character arrays by the C++ type system, all types compatible with `const char*` will be
-     directed to the string constructor instead. This is both for backwards compatibility, and due to the fact that a
+     directed to the string constructor instead. This is both for backwards compatibility and due to the fact that a
      binary type is not a standard JSON type.
     
     See the examples below.
@@ -99,8 +99,8 @@ basic_json(basic_json&& other) noexcept;
     2. C++ has no way of describing mapped types other than to list a list of pairs. As JSON requires that keys must be
        of type string, rule 2 is the weakest constraint one can pose on initializer lists to interpret them as an
        object.
-    3. In all other cases, the initializer list could not be interpreted as JSON object type, so interpreting it as JSON
-       array type is safe.
+    3. In all other cases, the initializer list could not be interpreted as a JSON object type, so interpreting it as a
+       JSON array type is safe.
     
     With the rules described above, the following JSON values cannot be expressed by an initializer list:
     
@@ -113,7 +113,7 @@ basic_json(basic_json&& other) noexcept;
 6. Constructs a JSON array value by creating `cnt` copies of a passed value. In case `cnt` is `0`, an empty array is
    created.
 
-7. Constructs the JSON value with the contents of the range `[first, last)`. The semantics depends on the different
+7. Constructs the JSON value with the contents of the range `[first, last)`. The semantics depend on the different
    types a JSON value can have:
 
     - In case of a `#!json null` type, [invalid_iterator.206](../../home/exceptions.md#jsonexceptioninvalid_iterator206)
@@ -175,10 +175,10 @@ basic_json(basic_json&& other) noexcept;
 :   the number of JSON copies of `val` to create
 
 `first` (in)
-:   begin of the range to copy from (included)
+:   the beginning of the range to copy from (included)
 
 `last` (in)
-:   end of the range to copy from (excluded)
+:   the end of the range to copy from (excluded)
 
 `other` (in)
 :   the JSON value to copy/move
@@ -188,10 +188,10 @@ basic_json(basic_json&& other) noexcept;
 1. Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
 2. No-throw guarantee: this constructor never throws exceptions.
 3. Depends on the called constructor. For types directly supported by the library (i.e., all types for which no
-   `to_json()` function was provided), strong guarantee holds: if an exception is thrown, there are no changes to any
+   `to_json()` function was provided), a strong guarantee holds: if an exception is thrown, there are no changes to any
    JSON value.
 4. Depends on the called constructor. For types directly supported by the library (i.e., all types for which no
-   `to_json()` function was provided), strong guarantee holds: if an exception is thrown, there are no changes to any
+   `to_json()` function was provided), a strong guarantee holds: if an exception is thrown, there are no changes to any
    JSON value.
 5. Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
 6. Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
@@ -217,7 +217,7 @@ basic_json(basic_json&& other) noexcept;
       `[first, last)` is undefined.
     - Throws [`invalid_iterator.204`](../../home/exceptions.md#jsonexceptioninvalid_iterator204) if iterators `first`
       and `last` belong to a primitive type (number, boolean, or string), but `first` does not point to the first
-      element anymore. In this case, the range `[first, last)` is undefined. See example code below.
+      element anymore. In this case, the range `[first, last)` is undefined. See the example code below.
     - Throws [`invalid_iterator.206`](../../home/exceptions.md#jsonexceptioninvalid_iterator206) if iterators `first`
       and `last` belong to a `#!json null` value. In this case, the range `[first, last)` is undefined.
 8. (none)
@@ -333,7 +333,7 @@ basic_json(basic_json&& other) noexcept;
     --8<-- "examples/basic_json__list_init_t.output"
     ```
 
-??? example "Example: (6) construct an array with count copies of given value"
+??? example "Example: (6) construct an array with count copies of a given value"
 
     The following code shows examples for creating arrays with several copies of a given value.
      

docs/mkdocs/docs/api/basic_json/binary.md

@@ -21,7 +21,7 @@ create a value for serialization to those formats.
 ## Parameters
 
 `init` (in)
-:   container containing bytes to use as binary type
+:   container containing bytes to use as a binary type
 
 `subtype` (in)
 :   subtype to use in CBOR, MessagePack, and BSON
@@ -42,8 +42,8 @@ Linear in the size of `init`; constant for `typename binary_t::container_type&&
 
 Note, this function exists because of the difficulty in correctly specifying the correct template overload in the
 standard value ctor, as both JSON arrays and JSON binary arrays are backed with some form of a `std::vector`. Because
-JSON binary arrays are a non-standard extension it was decided that it would be best to prevent automatic initialization
-of a binary array type, for backwards compatibility and so it does not happen on accident.
+JSON binary arrays are a non-standard extension, it was decided that it would be best to prevent automatic
+initialization of a binary array type, for backwards compatibility and so it does not happen on accident.
 
 ## Examples
 

docs/mkdocs/docs/api/basic_json/binary_t.md

@@ -56,11 +56,11 @@ type `#!cpp binary_t*` must be dereferenced.
 - MessagePack
     - If a subtype is given and the binary array contains exactly 1, 2, 4, 8, or 16 elements, the fixext family (fixext1,
       fixext2, fixext4, fixext8) is used. For other sizes, the ext family (ext8, ext16, ext32) is used. The subtype is
-      then added as signed 8-bit integer.
+      then added as a signed 8-bit integer.
     - If no subtype is given, the bin family (bin8, bin16, bin32) is used.
 
 - BSON
-    - If a subtype is given, it is used and added as unsigned 8-bit integer.
+    - If a subtype is given, it is used and added as an unsigned 8-bit integer.
     - If no subtype is given, the generic binary subtype 0x00 is used.
 
 ## Examples
@@ -86,4 +86,4 @@ type `#!cpp binary_t*` must be dereferenced.
 
 ## Version history
 
-- Added in version 3.8.0. Changed type of subtype to `std::uint64_t` in version 3.10.0.
+- Added in version 3.8.0. Changed the type of subtype to `std::uint64_t` in version 3.10.0.

docs/mkdocs/docs/api/basic_json/clear.md

@@ -33,7 +33,7 @@ Linear in the size of the JSON value.
 
 ## Notes
 
-All iterators, pointers and references related to this container are invalidated.
+All iterators, pointers, and references related to this container are invalidated.
 
 ## Examples
 

docs/mkdocs/docs/api/basic_json/contains.md

@@ -35,7 +35,7 @@ bool contains(const json_pointer& ptr) const;
 
 ## Return value
 
-1. `#!cpp true` if an element with specified `key` exists. If no such element with such key is found or the JSON value
+1. `#!cpp true` if an element with specified `key` exists. If no such element with such a key is found or the JSON value
    is not an object, `#!cpp false` is returned.
 2. See 1.
 3. `#!cpp true` if the JSON pointer can be resolved to a stored value, `#!cpp false` otherwise.

docs/mkdocs/docs/api/basic_json/dump.md

@@ -8,7 +8,7 @@ string_t dump(const int indent = -1,
 ```
 
 Serialization function for JSON values. The function tries to mimic Python's
-[`json.dumps()` function](https://docs.python.org/2/library/json.html#json.dump), and currently  supports its `indent`
+[`json.dumps()` function](https://docs.python.org/2/library/json.html#json.dump), and currently supports its `indent`
 and `ensure_ascii` parameters.
     
 ## Parameters
@@ -49,7 +49,7 @@ Linear.
 
 ## Notes
 
-Binary values are serialized as object containing two keys:
+Binary values are serialized as an object containing two keys:
 
 - "bytes": an array of bytes as integers
 - "subtype": the subtype as integer or `#!json null` if the binary has no subtype

docs/mkdocs/docs/api/basic_json/emplace.md

@@ -14,6 +14,11 @@ created from `args`.
 `Args`
 :   compatible types to create a `basic_json` object
 
+## Iterator invalidation
+
+For [`ordered_json`](../ordered_json.md), adding a value to an object can yield a reallocation, in which case all
+iterators (including the `end()` iterator) and all references to the elements are invalidated.
+
 ## Parameters
 
 `args` (in)

docs/mkdocs/docs/api/basic_json/emplace_back.md

@@ -13,6 +13,12 @@ Creates a JSON value from the passed parameters `args` to the end of the JSON va
 `Args`
 :   compatible types to create a `basic_json` object
 
+## Iterator invalidation
+
+By adding an element to the end of the array, a reallocation can happen, in which case all iterators (including the
+[`end()`](end.md) iterator) and all references to the elements are invalidated. Otherwise, only the [`end()`](end.md)
+iterator is invalidated.
+
 ## Parameters
 
 `args` (in)
@@ -48,6 +54,11 @@ Amortized constant.
     --8<-- "examples/emplace_back.output"
     ```
 
+## See also
+
+- [operator+=](operator+=.md) add a value to an array/object
+- [push_back](push_back.md) add a value to an array/object
+
 ## Version history
 
 - Since version 2.0.8.

docs/mkdocs/docs/api/basic_json/empty.md

@@ -4,7 +4,7 @@
 bool empty() const noexcept;
 ```
 
-Checks if a JSON value has no elements (i.e. whether its [`size()`](size.md) is `0`).
+Checks if a JSON value has no elements (i.e., whether its [`size()`](size.md) is `0`).
     
 ## Return value
 

docs/mkdocs/docs/api/basic_json/end_pos.md

@@ -0,0 +1,68 @@
+# <small>nlohmann::basic_json::</small>end_pos
+
+```cpp
+#if JSON_DIAGNOSTIC_POSITIONS
+constexpr std::size_t end_pos() const noexcept;
+#endif
+```
+
+Returns the position immediately following the last character of the JSON string from which the value was parsed from.
+
+| JSON type | return value                      |
+|-----------|-----------------------------------|
+| object    | position after the closing `}`    |
+| array     | position after the closing `]`    |
+| string    | position after the closing `"`    |
+| number    | position after the last character |
+| boolean   | position after `e`                |
+| null      | position after `l`                |
+
+## Return value
+
+the position of the character _following_ the last character of the given value in the parsed JSON string, if the
+value was created by the [`parse`](parse.md) function, or `std::string::npos` if the value was constructed otherwise
+
+## Exception safety
+
+No-throw guarantee: this member function never throws exceptions.
+
+## Complexity
+
+Constant.
+
+## Notes
+
+!!! note "Note"
+
+    The function is only available if macro [`JSON_DIAGNOSTIC_POSITIONS`](../macros/json_diagnostic_positions.md) has
+    been defined to `#!cpp 1` before including the library header.
+
+!!! warning "Invalidation"
+
+    The returned positions are only valid as long as the JSON value is not changed. The positions are *not* updated
+    when the JSON value is changed.
+
+## Examples
+
+??? example "Example"
+
+    ```cpp
+    --8<-- "examples/diagnostic_positions.cpp"
+    ```
+    
+    Output:
+
+    ```
+    --8<-- "examples/diagnostic_positions.output"
+    ```
+
+    The output shows the start/end positions of all the objects and fields in the JSON string.
+
+## See also
+
+- [start_pos](start_pos.md) to access the start position
+- [JSON_DIAGNOSTIC_POSITIONS](../macros/json_diagnostic_positions.md) for an overview of the diagnostic positions
+
+## Version history
+
+- Added in version 3.12.0.

docs/mkdocs/docs/api/basic_json/exception.md

@@ -8,24 +8,36 @@ This class is an extension of [`std::exception`](https://en.cppreference.com/w/c
 member `id` for exception ids. It is used as the base class for all exceptions thrown by the `basic_json` class. This
 class can hence be used as "wildcard" to catch exceptions, see example below.
 
-```plantuml
-std::exception <|-- basic_json::exception
-basic_json::exception <|-- basic_json::parse_error
-basic_json::exception <|-- basic_json::invalid_iterator
-basic_json::exception <|-- basic_json::type_error
-basic_json::exception <|-- basic_json::out_of_range
-basic_json::exception <|-- basic_json::other_error
+```mermaid
+classDiagram
+  direction LR
+  
+    class std_exception ["std::exception"] {
+        <<interface>>
+    }
 
-interface std::exception {}
+    class json_exception ["basic_json::exception"] {
+        +const int id
+        +const char* what() const
+    }
+    
+    class json_parse_error ["basic_json::parse_error"] {
+        +const std::size_t byte
+    }
 
-class basic_json::exception #FFFF00 {
-    + const int id
-    + const char* what() const
-}
+    class json_invalid_iterator ["basic_json::invalid_iterator"]
+    class json_type_error ["basic_json::type_error"]
+    class json_out_of_range ["basic_json::out_of_range"]
+    class json_other_error ["basic_json::other_error"]
 
-class basic_json::parse_error {
-    + const std::size_t byte
-}
+    std_exception <|-- json_exception
+    json_exception <|-- json_parse_error
+    json_exception <|-- json_invalid_iterator
+    json_exception <|-- json_type_error
+    json_exception <|-- json_out_of_range
+    json_exception <|-- json_other_error
+
+    style json_exception fill:#CCCCFF
 ```
 
 Subclasses:
@@ -68,7 +80,7 @@ constructor.
 
 ## See also
 
-[List of exceptions](127.0.0.1:8000/home/exceptions/)
+[List of exceptions](../../home/exceptions.md)
 
 ## Version history
 

docs/mkdocs/docs/api/basic_json/flatten.md

@@ -18,7 +18,7 @@ Strong exception safety: if an exception occurs, the original value stays intact
 
 ## Complexity
 
-Linear in the size the JSON value.
+Linear in the size of the JSON value.
 
 ## Notes
 

docs/mkdocs/docs/api/basic_json/from_bjdata.md

@@ -18,7 +18,7 @@ Deserializes a given input to a JSON value using the BJData (Binary JData) seria
 1. Reads from a compatible input.
 2. Reads from an iterator range.
 
-The exact mapping and its limitations is described on a [dedicated page](../../features/binary_formats/bjdata.md).
+The exact mapping and its limitations are described on a [dedicated page](../../features/binary_formats/bjdata.md).
 
 ## Template parameters
 
@@ -40,10 +40,10 @@ The exact mapping and its limitations is described on a [dedicated page](../../f
 :   an input in BJData format convertible to an input adapter
 
 `first` (in)
-:   iterator to start of the input
+:   iterator to the start of the input
 
 `last` (in)
-:   iterator to end of the input
+:   iterator to the end of the input
 
 `strict` (in)
 :   whether to expect the input to be consumed until EOF (`#!cpp true` by default)
@@ -63,7 +63,7 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
 ## Exceptions
 
 - Throws [parse_error.110](../../home/exceptions.md#jsonexceptionparse_error110) if the given input ends prematurely or
-  the end of file was not reached when `strict` was set to true
+  the end of the file was not reached when `strict` was set to true
 - Throws [parse_error.112](../../home/exceptions.md#jsonexceptionparse_error112) if a parse error occurs
 - Throws [parse_error.113](../../home/exceptions.md#jsonexceptionparse_error113) if a string could not be parsed
   successfully

docs/mkdocs/docs/api/basic_json/from_bson.md

@@ -18,7 +18,7 @@ Deserializes a given input to a JSON value using the BSON (Binary JSON) serializ
 1. Reads from a compatible input.
 2. Reads from an iterator range.
 
-The exact mapping and its limitations is described on a [dedicated page](../../features/binary_formats/bson.md).
+The exact mapping and its limitations are described on a [dedicated page](../../features/binary_formats/bson.md).
 
 ## Template parameters
 
@@ -40,10 +40,10 @@ The exact mapping and its limitations is described on a [dedicated page](../../f
 :   an input in BSON format convertible to an input adapter
 
 `first` (in)
-:   iterator to start of the input
+:   iterator to the start of the input
 
 `last` (in)
-:   iterator to end of the input
+:   iterator to the end of the input
 
 `strict` (in)
 :   whether to expect the input to be consumed until EOF (`#!cpp true` by default)

docs/mkdocs/docs/api/basic_json/from_cbor.md

@@ -21,7 +21,7 @@ Deserializes a given input to a JSON value using the CBOR (Concise Binary Object
 1. Reads from a compatible input.
 2. Reads from an iterator range.
 
-The exact mapping and its limitations is described on a [dedicated page](../../features/binary_formats/cbor.md).
+The exact mapping and its limitations are described on a [dedicated page](../../features/binary_formats/cbor.md).
 
 ## Template parameters
 
@@ -43,10 +43,10 @@ The exact mapping and its limitations is described on a [dedicated page](../../f
 :   an input in CBOR format convertible to an input adapter
 
 `first` (in)
-:   iterator to start of the input
+:   iterator to the start of the input
 
 `last` (in)
-:   iterator to end of the input
+:   iterator to the end of the input
 
 `strict` (in)
 :   whether to expect the input to be consumed until EOF (`#!cpp true` by default)
@@ -70,10 +70,10 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
 ## Exceptions
  
 - Throws [parse_error.110](../../home/exceptions.md#jsonexceptionparse_error110) if the given input ends prematurely or
-  the end of file was not reached when `strict` was set to true
+  the end of the file was not reached when `strict` was set to true
 - Throws [parse_error.112](../../home/exceptions.md#jsonexceptionparse_error112) if unsupported features from CBOR were
   used in the given input or if the input is not valid CBOR
-- Throws [parse_error.113](../../home/exceptions.md#jsonexceptionparse_error113) if a string was expected as map key,
+- Throws [parse_error.113](../../home/exceptions.md#jsonexceptionparse_error113) if a string was expected as a map key,
   but not found
 
 ## Complexity

docs/mkdocs/docs/api/basic_json/from_msgpack.md

@@ -18,7 +18,7 @@ Deserializes a given input to a JSON value using the MessagePack serialization f
 1. Reads from a compatible input.
 2. Reads from an iterator range.
 
-The exact mapping and its limitations is described on a [dedicated page](../../features/binary_formats/messagepack.md).
+The exact mapping and its limitations are described on a [dedicated page](../../features/binary_formats/messagepack.md).
 
 ## Template parameters
 
@@ -40,10 +40,10 @@ The exact mapping and its limitations is described on a [dedicated page](../../f
 :   an input in MessagePack format convertible to an input adapter
 
 `first` (in)
-:   iterator to start of the input
+:   iterator to the start of the input
 
 `last` (in)
-:   iterator to end of the input
+:   iterator to the end of the input
 
 `strict` (in)
 :   whether to expect the input to be consumed until EOF (`#!cpp true` by default)
@@ -54,7 +54,7 @@ The exact mapping and its limitations is described on a [dedicated page](../../f
 ## Return value
 
 deserialized JSON value; in case of a parse error and `allow_exceptions` set to `#!cpp false`, the return value will be
-`value_t::discarded`.  The latter can be checked with [`is_discarded`](is_discarded.md).
+`value_t::discarded`. The latter can be checked with [`is_discarded`](is_discarded.md).
 
 ## Exception safety
 
@@ -63,10 +63,10 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
 ## Exceptions
 
 - Throws [parse_error.110](../../home/exceptions.md#jsonexceptionparse_error110) if the given input ends prematurely or
-  the end of  file was not reached when `strict` was set to true
+  the end of the file was not reached when `strict` was set to true
 - Throws [parse_error.112](../../home/exceptions.md#jsonexceptionparse_error112) if unsupported features from
   MessagePack were used in the given input or if the input is not valid MessagePack
-- Throws [parse_error.113](../../home/exceptions.md#jsonexceptionparse_error113) if a string was expected as map key,
+- Throws [parse_error.113](../../home/exceptions.md#jsonexceptionparse_error113) if a string was expected as a map key,
   but not found
 
 ## Complexity

docs/mkdocs/docs/api/basic_json/from_ubjson.md

@@ -18,7 +18,7 @@ Deserializes a given input to a JSON value using the UBJSON (Universal Binary JS
 1. Reads from a compatible input.
 2. Reads from an iterator range.
 
-The exact mapping and its limitations is described on a [dedicated page](../../features/binary_formats/ubjson.md).
+The exact mapping and its limitations are described on a [dedicated page](../../features/binary_formats/ubjson.md).
 
 ## Template parameters
 
@@ -40,10 +40,10 @@ The exact mapping and its limitations is described on a [dedicated page](../../f
 :   an input in UBJSON format convertible to an input adapter
 
 `first` (in)
-:   iterator to start of the input
+:   iterator to the start of the input
 
 `last` (in)
-:   iterator to end of the input
+:   iterator to the end of the input
 
 `strict` (in)
 :   whether to expect the input to be consumed until EOF (`#!cpp true` by default)
@@ -63,7 +63,7 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
 ## Exceptions
 
 - Throws [parse_error.110](../../home/exceptions.md#jsonexceptionparse_error110) if the given input ends prematurely or
-  the end of file was not reached when `strict` was set to true
+  the end of the file was not reached when `strict` was set to true
 - Throws [parse_error.112](../../home/exceptions.md#jsonexceptionparse_error112) if a parse error occurs
 - Throws [parse_error.113](../../home/exceptions.md#jsonexceptionparse_error113) if a string could not be parsed 
   successfully

docs/mkdocs/docs/api/basic_json/front.md

@@ -10,8 +10,8 @@ Returns a reference to the first element in the container. For a JSON container
     
 ## Return value
 
-In case of a structured type (array or object), a reference to the first element is returned. In case of number, string,
-boolean, or binary values, a reference to the value is returned.
+In the case of a structured type (array or object), a reference to the first element is returned. In the case of number,
+string, boolean, or binary values, a reference to the value is returned.
 
 ## Exception safety
 

docs/mkdocs/docs/api/basic_json/get_ptr.md

@@ -35,7 +35,37 @@ Constant.
 
 !!! danger "Undefined behavior"
 
-    Writing data to the pointee of the result yields an undefined state.
+    The pointer becomes invalid if the underlying JSON object changes.
+
+    Consider the following example code where the pointer `ptr` changes after the array is resized. As a result,
+    reading or writing to `ptr` after the array change would be undefined behavior. The address of the first array
+    element changes, because the underlying `std::vector` is resized after adding a fifth element.
+
+    ```cpp
+    #include <iostream>
+    #include <nlohmann/json.hpp>
+    
+    using json = nlohmann::json;
+    
+    int main()
+    {
+        json j = {1, 2, 3, 4};
+        auto* ptr = j[0].get_ptr<std::int64_t*>();
+        std::cout << "value at " << ptr << " is " << *ptr << std::endl;
+    
+        j.push_back(5);
+    
+        ptr = j[0].get_ptr<std::int64_t*>();
+        std::cout << "value at " << ptr << " is " << *ptr << std::endl;
+    }
+    ```
+
+    Output:
+
+    ```
+    value at 0x6000012fc1c8 is 1
+    value at 0x6000029fc088 is 1
+    ```
 
 ## Examples
 
@@ -54,6 +84,10 @@ Constant.
     --8<-- "examples/get_ptr.output"
     ```
 
+## See also
+
+- [get_ref()](get_ref.md) get a reference value
+
 ## Version history
 
 - Added in version 1.0.0.

docs/mkdocs/docs/api/basic_json/get_ref.md

@@ -40,7 +40,7 @@ Constant.
 
 !!! danger "Undefined behavior"
 
-    Writing data to the referee of the result yields an undefined state.
+    The reference becomes invalid if the underlying JSON object changes.
 
 ## Examples
 
@@ -58,6 +58,10 @@ Constant.
     --8<-- "examples/get_ref.output"
     ```
 
+## See also
+
+- [get_ptr()](get_ptr.md) get a pointer value
+
 ## Version history
 
 - Added in version 1.1.0.

docs/mkdocs/docs/api/basic_json/index.md

@@ -13,7 +13,8 @@ template<
     class NumberFloatType = double,
     template<typename U> class AllocatorType = std::allocator,
     template<typename T, typename SFINAE = void> class JSONSerializer = adl_serializer,
-    class BinaryType = std::vector<std::uint8_t>
+    class BinaryType = std::vector<std::uint8_t>,
+    class CustomBaseClass = void
 >
 class basic_json;
 ```
@@ -32,15 +33,24 @@ class basic_json;
 | `AllocatorType`      | type of the allocator to use                                              |                                             |
 | `JSONSerializer`     | the serializer to resolve internal calls to `to_json()` and `from_json()` | [`json_serializer`](json_serializer.md)     |
 | `BinaryType`         | type for binary arrays                                                    | [`binary_t`](binary_t.md)                   |
+| `CustomBaseClass`    | extension point for user code                                             | [`json_base_class_t`](json_base_class_t.md) |
 
 ## Specializations
 
 - [**json**](../json.md) - default specialization
-- [**ordered_json**](../ordered_json.md) - specialization that maintains the insertion order of object keys
+- [**ordered_json**](../ordered_json.md) - a specialization that maintains the insertion order of object keys
 
 ## Iterator invalidation
 
-Todo
+All operations that add values to an **array** ([`push_back`](push_back.md) , [`operator+=`](operator+=.md),
+[`emplace_back`](emplace_back.md), [`insert`](insert.md), and [`operator[]`](operator%5B%5D.md) for a non-existing
+index) can yield a reallocation, in which case all iterators (including the [`end()`](end.md) iterator) and all
+references to the elements are invalidated.
+
+For [`ordered_json`](../ordered_json.md), also all operations that add a value to an **object**
+([`push_back`](push_back.md), [`operator+=`](operator+=.md), [`emplace`](emplace.md), [`insert`](insert.md),
+[`update`](update.md), and [`operator[]`](operator%5B%5D.md) for a non-existing key) can yield a reallocation, in
+which case all iterators (including the [`end()`](end.md) iterator) and all references to the elements are invalidated.
 
 ## Requirements
 
@@ -48,8 +58,8 @@ The class satisfies the following concept requirements:
 
 ### Basic
 
-- [DefaultConstructible](https://en.cppreference.com/w/cpp/named_req/DefaultConstructible): JSON values can be default
-  constructed. The result will be a JSON null value.
+- [DefaultConstructible](https://en.cppreference.com/w/cpp/named_req/DefaultConstructible): JSON values can be
+  default-constructed. The result will be a JSON null value.
 - [MoveConstructible](https://en.cppreference.com/w/cpp/named_req/MoveConstructible): A JSON value can be constructed
   from an rvalue argument.
 - [CopyConstructible](https://en.cppreference.com/w/cpp/named_req/CopyConstructible): A JSON value can be
@@ -71,7 +81,7 @@ The class satisfies the following concept requirements:
 - [EqualityComparable](https://en.cppreference.com/w/cpp/named_req/EqualityComparable): JSON values can be compared with
   `==`, see [`operator==`](operator_eq.md).
 - [LessThanComparable](https://en.cppreference.com/w/cpp/named_req/LessThanComparable): JSON values can be compared with
-  `<`, see [`operator<`](operator_le).
+  `<`, see [`operator<`](operator_le.md).
 - [Swappable](https://en.cppreference.com/w/cpp/named_req/Swappable): Any JSON lvalue or rvalue of can be swapped with
   any lvalue or rvalue of other compatible types, using unqualified function `swap`.
 - [NullablePointer](https://en.cppreference.com/w/cpp/named_req/NullablePointer): JSON values can be compared against
@@ -86,7 +96,7 @@ The class satisfies the following concept requirements:
 
 ## Member types
 
-- [**adl_serializer**](../adl_serializer) - the default serializer
+- [**adl_serializer**](../adl_serializer/index.md) - the default serializer
 - [**value_t**](value_t.md) - the JSON type enumeration
 - [**json_pointer**](../json_pointer/index.md) - JSON Pointer implementation
 - [**json_serializer**](json_serializer.md) - type of the serializer to for conversions from/to JSON
@@ -146,9 +156,9 @@ The class satisfies the following concept requirements:
 - [(constructor)](basic_json.md)
 - [(destructor)](~basic_json.md)
 - [**operator=**](operator=.md) - copy assignment
-- [**array**](array_t.md) (_static_) - explicitly create an array
+- [**array**](array.md) (_static_) - explicitly create an array
 - [**binary**](binary.md) (_static_) - explicitly create a binary array
-- [**object**](object_t.md) (_static_) - explicitly create an object
+- [**object**](object.md) (_static_) - explicitly create an object
 
 ### Object inspection
 
@@ -157,19 +167,24 @@ Functions to inspect the type of a JSON value.
 - [**type**](type.md) - return the type of the JSON value
 - [**operator value_t**](operator_value_t.md) - return the type of the JSON value
 - [**type_name**](type_name.md) - return the type as string
-- [**is_primitive**](is_primitive.md) - return whether type is primitive
-- [**is_structured**](is_structured.md) - return whether type is structured
-- [**is_null**](is_null.md) - return whether value is null
-- [**is_boolean**](is_boolean.md) - return whether value is a boolean
-- [**is_number**](is_number.md) - return whether value is a number
-- [**is_number_integer**](is_number_integer.md) - return whether value is an integer number
-- [**is_number_unsigned**](is_number_unsigned.md) - return whether value is an unsigned integer number
-- [**is_number_float**](is_number_float.md) - return whether value is a floating-point number
-- [**is_object**](is_object.md) - return whether value is an object
-- [**is_array**](is_array.md) - return whether value is an array
-- [**is_string**](is_string.md) - return whether value is a string
-- [**is_binary**](is_binary.md) - return whether value is a binary array
-- [**is_discarded**](is_discarded.md) - return whether value is discarded
+- [**is_primitive**](is_primitive.md) - return whether the type is primitive
+- [**is_structured**](is_structured.md) - return whether the type is structured
+- [**is_null**](is_null.md) - return whether the value is null
+- [**is_boolean**](is_boolean.md) - return whether the value is a boolean
+- [**is_number**](is_number.md) - return whether the value is a number
+- [**is_number_integer**](is_number_integer.md) - return whether the value is an integer number
+- [**is_number_unsigned**](is_number_unsigned.md) - return whether the value is an unsigned integer number
+- [**is_number_float**](is_number_float.md) - return whether the value is a floating-point number
+- [**is_object**](is_object.md) - return whether the value is an object
+- [**is_array**](is_array.md) - return whether the value is an array
+- [**is_string**](is_string.md) - return whether the value is a string
+- [**is_binary**](is_binary.md) - return whether the value is a binary array
+- [**is_discarded**](is_discarded.md) - return whether the value is discarded
+
+Optional functions to access the [diagnostic positions](../macros/json_diagnostic_positions.md).
+
+- [**start_pos**](start_pos.md) - return the start position of the value
+- [**end_pos**](end_pos.md) - return the one past the end position of the value
 
 ### Value access
 
@@ -222,7 +237,7 @@ Access to the JSON value
 - [**push_back**](push_back.md) - add a value to an array/object
 - [**operator+=**](operator+=.md) - add a value to an array/object
 - [**emplace_back**](emplace_back.md) - add a value to an array
-- [**emplace**](emplace.md) - add a value to an object if key does not exist
+- [**emplace**](emplace.md) - add a value to an object if a key does not exist
 - [**erase**](erase.md) - remove elements
 - [**insert**](insert.md) - inserts elements
 - [**update**](update.md) - updates a JSON object from another object, overwriting existing keys 

docs/mkdocs/docs/api/basic_json/insert.md

@@ -18,11 +18,22 @@ iterator insert(const_iterator pos, initializer_list_t ilist);
 void insert(const_iterator first, const_iterator last);
 ```
 
-1. Inserts element `val` into array before iterator `pos`.
-2. Inserts `cnt` copies of `val` into array before iterator `pos`.
-3. Inserts elements from range `[first, last)` into array before iterator `pos`.
-4. Inserts elements from initializer list `ilist` into array before iterator `pos`.
-5. Inserts elements from range `[first, last)` into object.
+1. Inserts element `val` into an array before iterator `pos`.
+2. Inserts `cnt` copies of `val` into an array before iterator `pos`.
+3. Inserts elements from range `[first, last)` into an array before iterator `pos`.
+4. Inserts elements from initializer list `ilist` into an array before iterator `pos`.
+5. Inserts elements from range `[first, last)` into an object.
+
+## Iterator invalidation
+
+For all cases where an element is added to an **array**, a reallocation can happen, in which case all iterators
+(including the [`end()`](end.md) iterator) and all references to the elements are invalidated. Otherwise, only the
+[`end()`](end.md) iterator is invalidated. Also, any iterator or reference after the insertion point will point to the
+same index, which is now a different value.
+
+For [`ordered_json`](../ordered_json.md), also adding an element to an **object** can yield a reallocation which again
+invalidates all iterators and all references. Also, any iterator or reference after the insertion point will point to
+the same index, which is now a different value.
 
 ## Parameters
 
@@ -36,10 +47,10 @@ void insert(const_iterator first, const_iterator last);
 :   number of copies of `val` to insert
 
 `first` (in)
-:   begin of the range of elements to insert
+:   the start of the range of elements to insert
 
 `last` (in)
-:   end of the range of elements to insert
+:   the end of the range of elements to insert
 
 `ilist` (in)
 :   initializer list to insert the values from
@@ -128,7 +139,7 @@ Strong exception safety: if an exception occurs, the original value stays intact
     --8<-- "examples/insert__count.output"
     ```
 
-??? example "Example (3): insert range of elements into array"
+??? example "Example (3): insert a range of elements into an array"
 
     The example shows how `insert()` is used.
     
@@ -142,7 +153,7 @@ Strong exception safety: if an exception occurs, the original value stays intact
     --8<-- "examples/insert__range.output"
     ```
 
-??? example "Example (4): insert elements from initializer list into array"
+??? example "Example (4): insert elements from an initializer list into an array"
 
     The example shows how `insert()` is used.
     
@@ -156,7 +167,7 @@ Strong exception safety: if an exception occurs, the original value stays intact
     --8<-- "examples/insert__ilist.output"
     ```
 
-??? example "Example (5): insert range of elements into object"
+??? example "Example (5): insert a range of elements into an object"
 
     The example shows how `insert()` is used.
     

docs/mkdocs/docs/api/basic_json/invalid_iterator.md

@@ -8,26 +8,36 @@ This exception is thrown if iterators passed to a library function do not match
 
 Exceptions have ids 2xx (see [list of iterator errors](../../home/exceptions.md#iterator-errors)).
 
-```plantuml
-std::exception <|-- basic_json::exception
-basic_json::exception <|-- basic_json::parse_error
-basic_json::exception <|-- basic_json::invalid_iterator
-basic_json::exception <|-- basic_json::type_error
-basic_json::exception <|-- basic_json::out_of_range
-basic_json::exception <|-- basic_json::other_error
+```mermaid
+classDiagram
+  direction LR
+  
+    class std_exception ["std::exception"] {
+        <<interface>>
+    }
 
-interface std::exception {}
+    class json_exception ["basic_json::exception"] {
+        +const int id
+        +const char* what() const
+    }
+    
+    class json_parse_error ["basic_json::parse_error"] {
+        +const std::size_t byte
+    }
 
-class basic_json::exception {
-    + const int id
-    + const char* what() const
-}
+    class json_invalid_iterator ["basic_json::invalid_iterator"]
+    class json_type_error ["basic_json::type_error"]
+    class json_out_of_range ["basic_json::out_of_range"]
+    class json_other_error ["basic_json::other_error"]
 
-class basic_json::parse_error {
-    + const std::size_t byte
-}
+    std_exception <|-- json_exception
+    json_exception <|-- json_parse_error
+    json_exception <|-- json_invalid_iterator
+    json_exception <|-- json_type_error
+    json_exception <|-- json_out_of_range
+    json_exception <|-- json_other_error
 
-class basic_json::invalid_iterator #FFFF00 {}
+    style json_invalid_iterator fill:#CCCCFF
 ```
 
 ## Member functions

docs/mkdocs/docs/api/basic_json/is_binary.md

@@ -4,7 +4,7 @@
 constexpr bool is_binary() const noexcept;
 ```
 
-This function returns `#!cpp true` if and only if the JSON value is binary array.
+This function returns `#!cpp true` if and only if the JSON value is a binary array.
     
 ## Return value
 

docs/mkdocs/docs/api/basic_json/is_number.md

@@ -9,7 +9,7 @@ unsigned) and floating-point values.
     
 ## Return value
 
-`#!cpp true` if type is number (regardless whether integer, unsigned integer or floating-type), `#!cpp false` otherwise.
+`#!cpp true` if type is number (regardless whether integer, unsigned integer, or floating-type), `#!cpp false` otherwise.
 
 ## Exception safety
 
@@ -46,9 +46,9 @@ constexpr bool is_number() const noexcept
 
 ## See also
 
-- [is_number_integer()](is_number_integer.md) check if value is an integer or unsigned integer number
-- [is_number_unsigned()](is_number_unsigned.md) check if value is an unsigned integer number
-- [is_number_float()](is_number_float.md) check if value is a floating-point number
+- [is_number_integer()](is_number_integer.md) check if the value is an integer or unsigned integer number
+- [is_number_unsigned()](is_number_unsigned.md) check if the value is an unsigned integer number
+- [is_number_float()](is_number_float.md) check if the value is a floating-point number
 
 ## Version history
 

docs/mkdocs/docs/api/basic_json/is_number_float.md

@@ -37,9 +37,9 @@ Constant.
 
 ## See also
 
-- [is_number()](is_number.md) check if value is a number
-- [is_number_integer()](is_number_integer.md) check if value is an integer or unsigned integer number
-- [is_number_unsigned()](is_number_unsigned.md) check if value is an unsigned integer number
+- [is_number()](is_number.md) check if the value is a number
+- [is_number_integer()](is_number_integer.md) check if the value is an integer or unsigned integer number
+- [is_number_unsigned()](is_number_unsigned.md) check if the value is an unsigned integer number
 
 ## Version history
 

docs/mkdocs/docs/api/basic_json/is_number_integer.md

@@ -37,9 +37,9 @@ Constant.
 
 ## See also
 
-- [is_number()](is_number.md) check if value is a number
-- [is_number_unsigned()](is_number_unsigned.md) check if value is an unsigned integer number
-- [is_number_float()](is_number_float.md) check if value is a floating-point number
+- [is_number()](is_number.md) check if the value is a number
+- [is_number_unsigned()](is_number_unsigned.md) check if the value is an unsigned integer number
+- [is_number_float()](is_number_float.md) check if the value is a floating-point number
 
 ## Version history
 

docs/mkdocs/docs/api/basic_json/is_number_unsigned.md

@@ -37,9 +37,9 @@ Constant.
 
 ## See also
 
-- [is_number()](is_number.md) check if value is a number
-- [is_number_integer()](is_number_integer.md) check if value is an integer or unsigned integer number
-- [is_number_float()](is_number_float.md) check if value is a floating-point number
+- [is_number()](is_number.md) check if the value is a number
+- [is_number_integer()](is_number_integer.md) check if the value is an integer or unsigned integer number
+- [is_number_float()](is_number_float.md) check if the value is a floating-point number
 
 ## Version history