Bump actions/checkout from 6.0.3 to 7.0.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 6.0.3 to 7.0.0. - [Release notes](https://github.com/actions/checkout/releases) - [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md) - [Commits](https://github.com/actions/checkout/compare/df4cb1c069e1874edd31b4311f1884172cec0e10...9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0) --- updated-dependencies: - dependency-name: actions/checkout dependency-version: 7.0.0 dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com>
added explicit instantiations of 'has_from_json' and 'has_to_json' for std_fs::path (#5209 )
2026-06-18 18:34:17 +00:00 · 2026-06-18 15:43:28 +00:00 · 2026-06-17 21:11:14 +02:00 · 2026-06-16 22:05:44 +02:00 · 2026-06-12 18:07:39 +02:00 · 2026-06-11 09:41:52 +02:00
278 changed files with 4518 additions and 892 deletions
@@ -1,4 +1,5 @@
 # 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: '*,

@@ -21,6 +22,7 @@ Checks: '*,
         -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,
@@ -33,6 +35,7 @@ Checks: '*,
         -fuchsia-overloaded-operator,
         -google-explicit-constructor,
         -google-readability-function-size,
+         -google-runtime-float,
         -google-runtime-int,
         -google-runtime-references,
         -hicpp-avoid-goto,
@@ -44,6 +47,8 @@ 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,
@@ -59,13 +64,16 @@ Checks: '*,
         -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
@@ -153,6 +153,9 @@ files directly; instead, modify the include/nlohmann sources and regenerate the
 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
@@ -14,6 +14,8 @@ 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.
+        **Please check the [FAQ](https://json.nlohmann.me/home/faq/) before
+        reporting an issue.** Common questions are answered there.        
  - type: textarea
    id: summary
    attributes:
@@ -11,7 +11,7 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
+        uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
        with:
          egress-policy: audit

@@ -20,7 +20,7 @@ jobs:
          mkdir -p ./pr
          echo ${{ github.event.number }} > ./pr/number
          echo ${{ github.event.pull_request.user.login }} > ./pr/author
-      - uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: pr
          path: pr/
@@ -34,18 +34,18 @@ jobs:

    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
+        uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
        with:
          egress-policy: audit

      - name: Checkout pull request
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          path: main
          ref: ${{ github.event.pull_request.head.sha }}

      - name: Checkout tools
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          path: tools
          ref: develop
@@ -6,29 +6,29 @@ permissions:

 jobs:
  Fuzzing:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
    steps:
    - name: Harden Runner
-      uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
+      uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
      with:
        egress-policy: audit

    - name: Build Fuzzers
      id: build
-      uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@57fe4475324c5506adbfecdcdd2917f65c86ee9e # master
+      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@57fe4475324c5506adbfecdcdd2917f65c86ee9e # master
+      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@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+      uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
      if: failure() && steps.build.outcome == 'success'
      with:
        name: artifacts
@@ -27,23 +27,23 @@ jobs:

    steps:
    - name: Harden Runner
-      uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
+      uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
      with:
        egress-policy: audit

    - name: Checkout repository
-      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0

    # Initializes the CodeQL tools for scanning.
    - name: Initialize CodeQL
-      uses: github/codeql-action/init@ff0a06e83cb2de871e5a09832bc6a81e7276941f # v3.28.18
+      uses: github/codeql-action/init@8aad20d150bbac5944a9f9d289da16a4b0d87c1e # v4.36.2
      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@ff0a06e83cb2de871e5a09832bc6a81e7276941f # v3.28.18
+      uses: github/codeql-action/autobuild@8aad20d150bbac5944a9f9d289da16a4b0d87c1e # v4.36.2

    - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@ff0a06e83cb2de871e5a09832bc6a81e7276941f # v3.28.18
+      uses: github/codeql-action/analyze@8aad20d150bbac5944a9f9d289da16a4b0d87c1e # v4.36.2
@@ -19,12 +19,12 @@ jobs:
      pull-requests: write
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
+        uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
        with:
          egress-policy: audit

      - name: 'Download artifact'
-        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          script: |
            var artifacts = await github.rest.actions.listWorkflowRunArtifacts({
@@ -46,7 +46,7 @@ jobs:
      - run: unzip pr.zip

      - name: 'Comment on PR'
-        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
@@ -17,11 +17,11 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
+        uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
        with:
          egress-policy: audit

      - name: 'Checkout Repository'
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: 'Dependency Review'
-        uses: actions/dependency-review-action@da24556b548a50705dd671f47852072ea4c105d9 # v4.7.1
+        uses: actions/dependency-review-action@a1d282b36b6f3519aa1f3fc636f609c47dddb294 # v5.0.0
@@ -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@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
+        with:
+          egress-policy: audit
+
+      - name: Checkout code
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+
+      - name: flawfinder_scan
+        uses: david-a-wheeler/flawfinder@c4216b74cf2639ffa98503768bd6e4299b5440c9 # v2.0.20
+        with:
+          arguments: '--sarif ./'
+          output: 'flawfinder_results.sarif'
+
+      - name: Upload analysis results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@8aad20d150bbac5944a9f9d289da16a4b0d87c1e # v4
+        with:
+          sarif_file: ${{github.workspace}}/flawfinder_results.sarif
@@ -17,10 +17,10 @@ jobs:

    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
+        uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
        with:
          egress-policy: audit

-      - uses: srvaroa/labeler@e7bef2249506ba9cbbd3ca5cee256abd9f930b04 # master
+      - uses: srvaroa/labeler@e8fbb2561481ef6e711a770f0234e9379dc76892 # master
        env:
          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
@@ -27,7 +27,7 @@ jobs:
 #      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
 #
 #    steps:
-#      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+#      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
 #      - name: Run CMake
 #        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
 #      - name: Build
@@ -45,7 +45,7 @@ jobs:
 #      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
 #
 #    steps:
-#      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+#      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
 #      - name: Run CMake
 #        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
 #      - name: Build
@@ -53,33 +53,34 @@ jobs:
 #      - name: Test
 #        run: cd build ; ctest -j 10 --output-on-failure

-  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_${{ matrix.xcode }}.app/Contents/Developer
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-      - name: Run CMake
-        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
-      - name: Build
-        run: cmake --build build --parallel 10
-      - name: Test
-        run: cd build ; ctest -j 10 --output-on-failure
+# macos-13 is deprecated (https://github.com/actions/runner-images/issues/13046)
+#  macos-13:
+#    runs-on: macos-13 # https://github.com/actions/runner-images/blob/main/images/macos/macos-13-Readme.md
+#    strategy:
+#      matrix:
+#        xcode: ['14.1', '14.2', '14.3', '14.3.1', '15.0.1', '15.1', '15.2']
+#    env:
+#      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+#
+#    steps:
+#      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+#      - 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: ['15.3', '15.4']
+        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@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Run CMake
        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
      - name: Build
@@ -91,12 +92,12 @@ jobs:
    runs-on: macos-15 # https://github.com/actions/runner-images/blob/main/images/macos/macos-15-Readme.md
    strategy:
      matrix:
-        xcode: ['16.0', '16.1', '16.2']
+        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@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Run CMake
        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
      - name: Build
@@ -111,7 +112,7 @@ jobs:
        standard: [11, 14, 17, 20, 23, 26]

    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Run CMake
        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_TestStandards=${{ matrix.standard }}
      - name: Build
@@ -27,11 +27,11 @@ jobs:
    runs-on: ubuntu-22.04
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
+        uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
        with:
          egress-policy: audit

-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0

      - name: Install virtual environment
        run: make install_venv -C docs/mkdocs
@@ -40,7 +40,7 @@ jobs:
        run: make build -C docs/mkdocs

      - name: Deploy documentation
-        uses: peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e # v4.0.0
+        uses: peaceiris/actions-gh-pages@84c30a85c19949d7eee79c4ff27748b70285e453 # v4.1.0
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          publish_dir: ./docs/mkdocs/site
@@ -36,17 +36,17 @@ jobs:

    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
+        uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
        with:
          egress-policy: audit

      - name: "Checkout code"
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false

      - name: "Run analysis"
-        uses: ossf/scorecard-action@f49aabe0b5af0936a0987cfb85d86b75731b0186 # v2.4.1
+        uses: ossf/scorecard-action@4eaacf0543bb3f2c246792bd56e8cdeffafb205a # v2.4.3
        with:
          results_file: results.sarif
          results_format: sarif
@@ -68,7 +68,7 @@ jobs:
      # 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@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: SARIF file
          path: results.sarif
@@ -76,6 +76,6 @@ jobs:

      # Upload the results to GitHub's code scanning dashboard.
      - name: "Upload to code-scanning"
-        uses: github/codeql-action/upload-sarif@ff0a06e83cb2de871e5a09832bc6a81e7276941f # v3.28.18
+        uses: github/codeql-action/upload-sarif@8aad20d150bbac5944a9f9d289da16a4b0d87c1e # v4.36.2
        with:
          sarif_file: results.sarif
@@ -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@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
+        with:
+          egress-policy: audit
+
+      # Checkout project source
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+
+      # 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@8aad20d150bbac5944a9f9d289da16a4b0d87c1e # v4
+        with:
+          sarif_file: semgrep.sarif
+        if: always()
@@ -16,11 +16,11 @@ jobs:

    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
+        uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
        with:
          egress-policy: audit

-      - uses: actions/stale@5bef64f19d7facfb25b37b414482c7164d639639 # v9.1.0
+      - uses: actions/stale@eb5cf3af3ac0a1aa4c9c45633dd1ae542a27a899 # v10.3.0
        with:
          stale-issue-label: 'state: stale'
          stale-pr-label: 'state: stale'
@@ -21,9 +21,9 @@ jobs:
    runs-on: ubuntu-latest
    container: gcc:latest
    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@ea004816823209b8d1211e47b216185caee12cc5 # v4.02
+        uses: lukka/get-cmake@591817e96fcad43505fb4eae36172462abb3a42e # v4.3.3
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -33,7 +33,7 @@ jobs:
    runs-on: ubuntu-latest
    container: ghcr.io/nlohmann/json-ci:v2.4.0
    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -46,15 +46,15 @@ jobs:
        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:
      - name: Harden Runner
-        uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
+        uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
        with:
          egress-policy: audit

      - name: Install Valgrind
        run: sudo apt-get update ; sudo apt-get install -y valgrind
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@ea004816823209b8d1211e47b216185caee12cc5 # v4.02
+        uses: lukka/get-cmake@591817e96fcad43505fb4eae36172462abb3a42e # v4.3.3
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -69,9 +69,9 @@ jobs:
    steps:
      - 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@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@ea004816823209b8d1211e47b216185caee12cc5 # v4.02
+        uses: lukka/get-cmake@591817e96fcad43505fb4eae36172462abb3a42e # v4.3.3
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -86,9 +86,9 @@ jobs:
    steps:
      - name: Install build-essential
        run: apt-get update ; apt-get install -y build-essential unzip wget git libssl-dev
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@ea004816823209b8d1211e47b216185caee12cc5 # v4.02
+        uses: lukka/get-cmake@591817e96fcad43505fb4eae36172462abb3a42e # v4.3.3
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -98,11 +98,11 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
+        uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
        with:
          egress-policy: audit

-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Install dependencies and de_DE locale
        run: |
          sudo apt-get clean
@@ -115,15 +115,16 @@ jobs:
      - name: Build
        run: cmake --build build --target ci_test_coverage
      - name: Archive coverage report
-        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: code-coverage-report
          path: ${{ github.workspace }}/build/html
      - name: Publish report to Coveralls
-        uses: coverallsapp/github-action@648a8eb78e6d50909eff900e4ec85cab4524a45b # v2.3.6
+        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_gcc_old:
    runs-on: ubuntu-latest
@@ -132,7 +133,7 @@ jobs:
        compiler: ['4.8', '4.9', '5', '6']
    container: ghcr.io/nlohmann/json-ci:v2.4.0
    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Run CMake
        run: CXX=g++-${{ matrix.compiler }} cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -146,9 +147,9 @@ jobs:
        compiler: ['7', '8', '9', '10', '11', '12', '13', '14', '15', 'latest']
    container: gcc:${{ matrix.compiler }}
    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@ea004816823209b8d1211e47b216185caee12cc5 # v4.02
+        uses: lukka/get-cmake@591817e96fcad43505fb4eae36172462abb3a42e # v4.3.3
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -161,11 +162,9 @@ jobs:
        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:${{ matrix.compiler }}
    steps:
-      - name: Install unzip and git
-        run: apt-get update ; apt-get install -y unzip git
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@ea004816823209b8d1211e47b216185caee12cc5 # v4.02
+        uses: lukka/get-cmake@591817e96fcad43505fb4eae36172462abb3a42e # v4.3.3
      - name: Set env FORCE_STDCPPFS_FLAG for clang 7 / 8 / 9 / 10
        run: echo "JSON_FORCED_GLOBAL_COMPILE_OPTIONS=-DJSON_HAS_FILESYSTEM=0;-DJSON_HAS_EXPERIMENTAL_FILESYSTEM=0" >> "$GITHUB_ENV"
        if: ${{ matrix.compiler == '7' || matrix.compiler == '8' || matrix.compiler == '9' || matrix.compiler == '10' }}
@@ -181,9 +180,9 @@ jobs:
      matrix:
        standard: [11, 14, 17, 20, 23, 26]
    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@ea004816823209b8d1211e47b216185caee12cc5 # v4.02
+        uses: lukka/get-cmake@591817e96fcad43505fb4eae36172462abb3a42e # v4.3.3
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -199,9 +198,9 @@ jobs:
    steps:
      - name: Install git and unzip
        run: apt-get update ; apt-get install -y git unzip
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@ea004816823209b8d1211e47b216185caee12cc5 # v4.02
+        uses: lukka/get-cmake@591817e96fcad43505fb4eae36172462abb3a42e # v4.3.3
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build with libc++
@@ -215,7 +214,7 @@ jobs:
    runs-on: ubuntu-latest
    container: ghcr.io/nlohmann/json-ci:v2.4.0
    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -228,9 +227,9 @@ jobs:
    runs-on: ubuntu-latest
    container: ${{ matrix.container }}
    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@ea004816823209b8d1211e47b216185caee12cc5 # v4.02
+        uses: lukka/get-cmake@591817e96fcad43505fb4eae36172462abb3a42e # v4.3.3
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -240,7 +239,7 @@ jobs:
    runs-on: ubuntu-latest
    container: ghcr.io/nlohmann/json-ci:v2.2.0
    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -252,15 +251,15 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
+        uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
        with:
          egress-policy: audit

      - name: Install emscripten
-        uses: mymindstorm/setup-emsdk@v14
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: mymindstorm/setup-emsdk@4528d102f7230f0e7b276855c01ea1159be0e984 # v16
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@ea004816823209b8d1211e47b216185caee12cc5 # v4.02
+        uses: lukka/get-cmake@591817e96fcad43505fb4eae36172462abb3a42e # v4.3.3
      - name: Run CMake
        run: cmake -S . -B build -DCMAKE_TOOLCHAIN_FILE=$EMSDK/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake -GNinja
      - name: Build
@@ -273,11 +272,11 @@ jobs:
        target: [ci_test_examples, ci_test_build_documentation]
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
+        uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
        with:
          egress-policy: audit

-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -18,15 +18,15 @@ concurrency:

 jobs:
  mingw:
-    runs-on: windows-2019
+    runs-on: windows-2022
    strategy:
      matrix:
        architecture: [x64, x86]

    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Set up MinGW
-        uses: egor-tensin/setup-mingw@84c781b557efd538dec66bde06988d81cd3138cf # v2.2.0
+        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
@@ -40,24 +40,14 @@ jobs:
  msvc:
    strategy:
      matrix:
-        runs_on: [windows-2019, windows-2022]
        build_type: [Debug, Release]
        architecture: [Win32, x64]
        std_version: [default, latest]

-    runs-on: ${{ matrix.runs_on }}
+    runs-on: windows-2022

    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-      - name: Set generator
-        id: generator
-        run: |
-          if [ "${{ matrix.runs_on }}" = "windows-2019" ]; then
-            echo "generator=Visual Studio 16 2019" >> $GITHUB_ENV
-          else
-            echo "generator=Visual Studio 17 2022" >> $GITHUB_ENV
-          fi
-        shell: bash
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Set extra CXX_FLAGS for latest std_version
        id: cxxflags
        run: |
@@ -68,11 +58,11 @@ jobs:
          fi
        shell: bash
      - name: Run CMake (Release)
-        run: cmake -S . -B build -G "$env:generator" -A ${{ matrix.architecture }} -DJSON_BuildTests=On -DCMAKE_CXX_FLAGS="$env:flags"
+        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 "$env:generator" -A ${{ matrix.architecture }} -DJSON_BuildTests=On -DJSON_FastTests=ON -DCMAKE_CXX_FLAGS="$env:flags"
+        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
@@ -81,33 +71,54 @@ jobs:
        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, 13, 14, 15]
+        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@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - 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-12:
-    runs-on: windows-2019
+    runs-on: windows-2022
    strategy:
      matrix:
        architecture: [Win32, x64]

    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - 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-2022
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - 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
+        
@@ -4,7 +4,7 @@ Upstream-Contact: Niels Lohmann <mail@nlohmann.me>
 Source: https://github.com/nlohmann/json

 Files: *
-Copyright: 2013-2025 Niels Lohmann <https://nlohmann.me>
+Copyright: 2013-2026 Niels Lohmann <https://nlohmann.me>
 License: MIT

 Files: include/nlohmann/thirdparty/hedley.hpp
@@ -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
 ##
@@ -1,6 +1,6 @@
 MIT License 

-Copyright (c) 2013-2025 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
@@ -0,0 +1,121 @@
+Creative Commons Legal Code
+
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+
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@@ -258,8 +258,8 @@ serve_header:
 ##########################################################################

 reuse:
-	pipx run reuse annotate --recursive single_include include -tjson --license MIT --copyright "Niels Lohmann <https://nlohmann.me>" --year "2013-2025" --merge-copyrights
-	pipx run reuse annotate $(TESTS_SRCS) -tjson_support --license MIT --copyright "Niels Lohmann <https://nlohmann.me>" --year "2013-2025" --merge-copyrights
+	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:
@@ -19,6 +19,7 @@
 [![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)
@@ -79,6 +80,8 @@ You can sponsor this library at [GitHub Sponsors](https://github.com/sponsors/nl

 - [Martti Laine](https://github.com/codeclown)
 - [Paul Harrington](https://github.com/phrrngtn)
+- [Mercedes-Benz Group](https://github.com/mercedes-benz)
+- [Ryan McCaffery](https://github.com/mccaffers)

 ### :label: Named Sponsors

@@ -157,9 +160,22 @@ 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:
+Assume you want to hard-code this literal JSON value as a `json` object:

 ```json
 {
@@ -331,7 +347,7 @@ Note the difference between serialization and assignment:
 json j_string = "this is a string";

 // retrieve the string value
-auto cpp_string = j_string.template get<std::string>();
+auto cpp_string = j_string.get<std::string>();
 // retrieve the string value (alternative when a variable already exists)
 std::string cpp_string2;
 j_string.get_to(cpp_string2);
@@ -340,7 +356,7 @@ j_string.get_to(cpp_string2);
 std::string serialized_string = j_string.dump();

 // output of original string
-std::cout << cpp_string << " == " << cpp_string2 << " == " << j_string.template get<std::string>() << '\n';
+std::cout << cpp_string << " == " << cpp_string2 << " == " << j_string.get<std::string>() << '\n';
 // output of serialized value
 std::cout << j_string << " == " << serialized_string << std::endl;
 ```
@@ -513,7 +529,7 @@ for (auto& element : j) {
 }

 // getter/setter
-const auto tmp = j[0].template get<std::string>();
+const auto tmp = j[0].get<std::string>();
 j[1] = 42;
 bool foo = j.at(2);

@@ -720,7 +736,7 @@ You can switch off implicit conversions by defining `JSON_USE_IMPLICIT_CONVERSIO
 // strings
 std::string s1 = "Hello, world!";
 json js = s1;
-auto s2 = js.template get<std::string>();
+auto s2 = js.get<std::string>();
 // NOT RECOMMENDED
 std::string s3 = js;
 std::string s4;
@@ -729,7 +745,7 @@ s4 = js;
 // Booleans
 bool b1 = true;
 json jb = b1;
-auto b2 = jb.template get<bool>();
+auto b2 = jb.get<bool>();
 // NOT RECOMMENDED
 bool b3 = jb;
 bool b4;
@@ -738,7 +754,7 @@ b4 = jb;
 // numbers
 int i = 42;
 json jn = i;
-auto f = jn.template get<double>();
+auto f = jn.get<double>();
 // NOT RECOMMENDED
 double f2 = jb;
 double f3;
@@ -781,9 +797,9 @@ j["age"] = p.age;

 // convert from JSON: copy each value from the JSON object
 ns::person p {
-    j["name"].template get<std::string>(),
-    j["address"].template get<std::string>(),
-    j["age"].template get<int>()
+    j["name"].get<std::string>(),
+    j["address"].get<std::string>(),
+    j["age"].get<int>()
 };
 ```

@@ -800,7 +816,7 @@ std::cout << j << std::endl;
 // {"address":"744 Evergreen Terrace","age":60,"name":"Ned Flanders"}

 // conversion: json -> person
-auto p2 = j.template get<ns::person>();
+auto p2 = j.get<ns::person>();

 // that's it
 assert(p == p2);
@@ -827,21 +843,21 @@ namespace ns {
 ```

 That's all! When calling the `json` constructor with your type, your custom `to_json` method will be automatically called.
-Likewise, when calling `template get<your_type>()` or `get_to(your_type&)`, the `from_json` method will be called.
+Likewise, when calling `get<your_type>()` or `get_to(your_type&)`, the `from_json` method will be called.

 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 `template 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.)
+- 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. 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.
+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/api/macros/#serializationdeserialization-macros) to make your life easier as long as you want to use a JSON object as serialization.

-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).
+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/features/arbitrary_types/#simplify-your-life-with-macros).

 ##### Example usage of macros

@@ -853,6 +869,18 @@ namespace ns {
 }
 ```

+If you want to inherit the `person` struct and add a field to it, it can be done with:
+
+```cpp
+namespace ns {
+    struct person_derived : person {
+        std::string email;
+    };
+    
+    NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE(person_derived, person, email)
+}
+```
+
 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
@@ -869,6 +897,24 @@ namespace ns {
 }
 ```

+Or in case if you use some naming convention that you do not want to expose to JSON:
+
+```cpp
+namespace ns {
+    class address {
+      private:
+        std::string m_street;
+        int m_housenumber;
+        int m_postcode;
+
+      public:
+        NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_NAMES(address, "street", m_street,
+                                                           "housenumber", m_housenumber,
+                                                           "postcode", m_postcode)
+    };
+}
+```
+
 #### How do I convert third-party types?

 This requires a bit more advanced technique. But first, let's see how this conversion mechanism works:
@@ -913,8 +959,8 @@ namespace nlohmann {
            if (j.is_null()) {
                opt = boost::none;
            } else {
-                opt = j.template get<T>(); // same as above, but with
-                                           // adl_serializer<T>::from_json
+                opt = j.get<T>(); // same as above, but with
+                                  // adl_serializer<T>::from_json
            }
        }
    };
@@ -941,7 +987,7 @@ namespace nlohmann {
        // note: the return type is no longer 'void', and the method only takes
        // one argument
        static move_only_type from_json(const json& j) {
-            return {j.template get<int>()};
+            return {j.get<int>()};
        }

        // Here's the catch! You must provide a to_json method! Otherwise, you
@@ -1005,7 +1051,7 @@ struct bad_serializer
    static void to_json(const BasicJsonType& j, T& 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!
    }
 };
 ```
@@ -1045,11 +1091,11 @@ assert(j == "stopped");

 // json string to enum
 json j3 = "running";
-assert(j3.template get<TaskState>() == TS_RUNNING);
+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.template get<TaskState>() == TS_INVALID);
+assert(jPi.get<TaskState>() == TS_INVALID);
 ```

 Just as in [Arbitrary Type Conversions](#arbitrary-types-conversions) above,
@@ -1059,7 +1105,7 @@ Just as in [Arbitrary Type Conversions](#arbitrary-types-conversions) above,

 Other Important points:

- When using `template get<ENUM_TYPE>()`, undefined JSON values will default to the first pair specified in your map. Select this default pair carefully.
+- When using `get<ENUM_TYPE>()`, undefined JSON values will default to the first pair specified in your map. Select this default pair carefully. If you desire an exception in this circumstance use `NLOHMANN_JSON_SERIALIZE_ENUM_STRICT()` which behaves identically except for throwing an exception on unrecognized values.
 - 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.

 ### Binary formats (BSON, CBOR, MessagePack, UBJSON, and BJData)
@@ -1141,7 +1187,7 @@ The library is used in multiple projects, applications, operating systems, etc.

 ## Supported compilers

-Though it's 2025 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 - 14.2 (and possibly later)
 - Clang 3.4 - 21.0 (and possibly later)
@@ -1320,7 +1366,7 @@ pkg-config nlohmann_json --cflags

 The class is licensed under the [MIT License](https://opensource.org/licenses/MIT):

-Copyright &copy; 2013-2025 [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:

@@ -1851,7 +1897,7 @@ 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:

 ```
 ===============================================================================
@@ -1869,6 +1915,8 @@ 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 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.
@@ -212,6 +212,21 @@ add_custom_target(ci_test_legacycomparison
    COMMENT "Compile and test with legacy discarded value comparison enabled"
 )

+###############################################################################
+# Enable brace-init copy semantics.
+###############################################################################
+
+add_custom_target(ci_test_brace_init_copy_semantics
+    COMMAND ${CMAKE_COMMAND}
+    -DCMAKE_BUILD_TYPE=Debug -GNinja
+    -DJSON_BuildTests=ON -DJSON_FastTests=ON
+    -DCMAKE_CXX_FLAGS=-DJSON_BRACE_INIT_COPY_SEMANTICS=1
+    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_brace_init_copy_semantics
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_brace_init_copy_semantics
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_brace_init_copy_semantics && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with brace-init copy semantics enabled"
+)
+
 ###############################################################################
 # Disable global UDLs.
 ###############################################################################
@@ -665,7 +680,8 @@ add_custom_target(ci_cuda_example

 add_custom_target(ci_module_cpp20
    COMMAND ${CMAKE_COMMAND}
-        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DCMAKE_BUILD_TYPE=Debug -GNinja 
+        -DJSON_CI=ON -DNLOHMANN_JSON_BUILD_MODULES=ON -DJSON_Install=ON
        -S${PROJECT_SOURCE_DIR}/tests/module_cpp20 -B${PROJECT_BINARY_DIR}/ci_module_cpp20
    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/ci_module_cpp20
 )
@@ -6,6 +6,7 @@
 # -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
@@ -17,4 +18,5 @@ set(CLANG_CXXFLAGS
    -Wno-padded
    -Wno-covered-switch-default
    -Wno-unsafe-buffer-usage
+    -Wno-missing-noreturn
 )
@@ -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)
@@ -56,10 +68,14 @@ 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
+        RUN_OUTPUT_VARIABLE LIBCPP_VERSION_OUTPUT
+        COMPILE_OUTPUT_VARIABLE LIBCPP_VERSION_COMPILE_OUTPUT
    )
    if(NOT LIBCPP_VERSION_OUTPUT)
        set(LIBCPP_VERSION_OUTPUT "Unknown")
@@ -1 +1 @@
-cppcheck==1.5.0
+cppcheck==1.5.1
@@ -1 +1 @@
-reuse==5.0.2
+reuse==6.2.0
@@ -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.
+
+
+
@@ -37,7 +37,7 @@ Copy of the JSON value, converted to `ValueType`
 ??? example "Example: (1) Default-constructible type"

    The example below shows how a `from_json` function can be implemented for a user-defined type. This function is
-    called by the `adl_serializer` when `template get<ns::person>()` is called.
+    called by the `adl_serializer` when `get<ns::person>()` is called.
        
    ```cpp
    --8<-- "examples/from_json__default_constructible.cpp"
@@ -90,10 +90,25 @@ Depends on what `json_serializer<ValueType>` `from_json()` method throws

 ## Notes

-!!! danger "Undefined behavior"
+!!! danger "Undefined behavior for pointers"

    Writing data to the pointee (overload 3) of the result yields an undefined state.

+!!! danger "Undefined behavior for numeric conversions"
+
+    Conversions between numeric types are performed by the corresponding
+    `from_json()` implementation using the target C++ type. When converting
+    between numeric types, the library does not check whether the source
+    value is representable by the target type.
+    
+    If the source value is outside the range of the target type, the behavior
+    is the same as the corresponding C++ conversion. In particular, converting
+    a floating-point value to an integer type that cannot represent the value
+    results in undefined behavior.
+
+    See [Number conversion](../../features/types/number_handling.md#number-conversion)
+    for more information.
+
 ## Examples

 ??? example
@@ -51,10 +51,10 @@ The SAX event lister must follow the interface of [`json_sax`](../json_sax/index
 ## Parameters

 `i` (in)
-:   Input to parse from.
+:   Input to parse from

 `sax` (in)
-:   SAX event listener
+:   SAX event listener (must not be null)

 `format` (in)
 :    the format to parse (JSON, CBOR, MessagePack, or UBJSON) (optional, `input_format_t::json` by default), see
@@ -83,6 +83,16 @@ return value of the last processed SAX event

 ## Exception safety

+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 unexpected token, or
+  empty input like a null `FILE*` or `char*` pointer.
+- Throws [`parse_error.102`](../../home/exceptions.md#jsonexceptionparse_error102) if `to_unicode` fails or surrogate
+  error.
+- Throws [`parse_error.103`](../../home/exceptions.md#jsonexceptionparse_error103) if `to_unicode` fails.
+
 ## Complexity

 Linear in the length of the input. The parser is a predictive LL(1) parser. The complexity can be higher if the SAX
@@ -110,7 +110,7 @@ changes to any JSON value.
    The value function is a template, and the return type of the function is determined by the type of the provided
    default value unless otherwise specified. This can have unexpected effects. In the example below, we store a 64-bit
    unsigned integer. We get exactly that value when using [`operator[]`](operator[].md). However, when we call `value`
-    and provide `#!c 0` as default value, then `#!c -1` is returned. The occurs, because `#!c 0` has type `#!c int`
+    and provide `#!c 0` as default value, then `#!c -1` is returned. This occurs, because `#!c 0` has type `#!c int`
    which overflows when handling the value `#!c 18446744073709551615`.

    To address this issue, either provide a correctly typed default value or use the template parameter to specify the
@@ -0,0 +1,37 @@
+# <small>nlohmann::json_pointer::</small>front
+
+```cpp
+const string_t& front() const;
+```
+
+Return the first reference token.
+
+## Return value
+
+First reference token.
+
+## Exceptions
+
+Throws [out_of_range.405](../../home/exceptions.md#jsonexceptionout_of_range405) if the JSON pointer has no parent.
+
+## Complexity
+
+Constant.
+
+## Examples
+
+??? example
+
+    The example shows the usage of `front`.
+     
+    ```cpp
+    --8<-- "examples/json_pointer__front.cpp"
+    ```
+    
+    Output:
+    
+    ```json
+    --8<-- "examples/json_pointer__front.output"
+    ```
+
+## Version history
@@ -37,6 +37,9 @@ are the base for JSON patches.
 - [**pop_back**](pop_back.md) - remove the last reference token
 - [**back**](back.md) - return last reference token
 - [**push_back**](push_back.md) - append an unescaped token at the end of the pointer
+- [**pop_front**](pop_front.md) - remove the first reference token
+- [**front**](front.md) - return first reference token
+- [**push_front**](push_front.md) - append an unescaped token at the start of the pointer
 - [**empty**](empty.md) - return whether the pointer points to the root document

 ## Literals
@@ -0,0 +1,33 @@
+# <small>nlohmann::json_pointer::</small>pop_front
+
+```cpp
+void pop_front();
+```
+
+Remove the first reference token.
+
+## Exceptions
+
+Throws [out_of_range.405](../../home/exceptions.md#jsonexceptionout_of_range405) if the JSON pointer has no parent.
+
+## Complexity
+
+Linear in the number of reference tokens in the `json_pointer`.
+
+## Examples
+
+??? example
+
+    The example shows the usage of `pop_front`.
+     
+    ```cpp
+    --8<-- "examples/json_pointer__pop_front.cpp"
+    ```
+    
+    Output:
+    
+    ```json
+    --8<-- "examples/json_pointer__pop_front.output"
+    ```
+
+## Version history
@@ -0,0 +1,36 @@
+# <small>nlohmann::json_pointer::</small>push_front
+
+```cpp
+void push_front(const string_t& token);
+
+void push_front(string_t&& token);
+```
+
+Append an unescaped token at the start of the reference pointer.
+
+## Parameters
+
+`token` (in)
+:   token to add
+
+## Complexity
+
+Linear in the number of reference tokens in the `json_pointer`.
+
+## Examples
+
+??? example
+
+    The example shows the result of `push_front` for different JSON Pointers.
+     
+    ```cpp
+    --8<-- "examples/json_pointer__push_front.cpp"
+    ```
+    
+    Output:
+    
+    ```json
+    --8<-- "examples/json_pointer__push_front.output"
+    ```
+
+## Version history
@@ -40,6 +40,7 @@ header. See also the [macro overview page](../../features/macros.md).

 ## Type conversions

+- [**JSON_BRACE_INIT_COPY_SEMANTICS**](json_brace_init_copy_semantics.md) - opt in to copy/move semantics for single-element brace initialization
 - [**JSON_DISABLE_ENUM_SERIALIZATION**](json_disable_enum_serialization.md) - switch off default serialization/deserialization functions for enums
 - [**JSON_USE_IMPLICIT_CONVERSIONS**](json_use_implicit_conversions.md) - control implicit conversions

@@ -53,6 +54,7 @@ header. See also the [macro overview page](../../features/macros.md).
 ### Enums

 - [**NLOHMANN_JSON_SERIALIZE_ENUM**](nlohmann_json_serialize_enum.md) - serialize/deserialize an enum
+- [**NLOHMANN_JSON_SERIALIZE_ENUM_STRICT**](nlohmann_json_serialize_enum_strict.md) - serialize/deserialize an enum with exceptions

 ### Classes and structs

@@ -81,3 +83,28 @@ header. See also the [macro overview page](../../features/macros.md).
  a derived class; uses default values
 - [**NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE**](nlohmann_define_derived_type.md) - serialize a derived
  class
+- [**NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_NAMES**](nlohmann_define_type_with_names.md) - serialize/deserialize a non-derived class
+  with private members; uses custom names
+- [**NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT_WITH_NAMES**](nlohmann_define_type_with_names.md) - serialize/deserialize a
+  non-derived class with private members; uses default values; uses custom names
+- [**NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES**](nlohmann_define_type_with_names.md) - serialize a non-derived class
+  with private members; uses custom names
+- [**NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_NAMES**](nlohmann_define_type_with_names.md) - serialize/deserialize a non-derived
+  class; uses custom names
+- [**NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT_WITH_NAMES**](nlohmann_define_type_with_names.md) - serialize/deserialize a
+  non-derived class; uses default values; uses custom names
+- [**NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES**](nlohmann_define_type_with_names.md) - serialize a
+  non-derived class; uses custom names
+
+- [**NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_NAMES**](nlohmann_define_type_with_names.md) - serialize/deserialize a derived class
+  with private members; uses custom names
+- [**NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT_WITH_NAMES**](nlohmann_define_type_with_names.md) - serialize/deserialize a
+  derived class with private members; uses default values; uses custom names
+- [**NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES**](nlohmann_define_type_with_names.md) - serialize a derived
+  class with private members; uses custom names
+- [**NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_NAMES**](nlohmann_define_type_with_names.md) - serialize/deserialize a derived
+  class; uses custom names
+- [**NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT_WITH_NAMES**](nlohmann_define_type_with_names.md) - serialize/deserialize
+  a derived class; uses default values; uses custom names
+- [**NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES**](nlohmann_define_type_with_names.md) - serialize a derived
+  class; uses custom names
@@ -0,0 +1,95 @@
+# JSON_BRACE_INIT_COPY_SEMANTICS
+
+```cpp
+#define JSON_BRACE_INIT_COPY_SEMANTICS /* value */
+```
+
+When defined to `1`, single-element brace initialization of a `basic_json` value is treated as a copy/move of the
+element rather than wrapping it in a single-element array.
+
+## Default definition
+
+The default value is `0` (disabled — existing behavior is preserved).
+
+```cpp
+#define JSON_BRACE_INIT_COPY_SEMANTICS 0
+```
+
+## Notes
+
+!!! note "Background"
+
+    C++ always prefers the `initializer_list` constructor over the copy/move constructor for brace initialization. This
+    means that code like
+
+    ```cpp
+    json obj = {{"key", "value"}};
+    json j{obj};
+    ```
+
+    creates a single-element **array** `[{"key":"value"}]` instead of a copy of `obj`. This behavior is
+    compiler-dependent for older compilers (GCC wrapped, Clang did not), but starting from Clang 20, both compilers
+    behave the same way.
+
+    Enabling this macro opts into copy/move semantics for this case
+    (see [#5074](https://github.com/nlohmann/json/issues/5074)).
+
+!!! warning "Opt-in only"
+
+    This macro must be defined **before** including `<nlohmann/json.hpp>`. Defining it after the include has no effect.
+
+!!! tip "Workaround without the macro"
+
+    To explicitly create a single-element array without enabling this macro, use `json::array()`:
+
+    ```cpp
+    json j = json::array({obj});  // always creates [obj]
+    ```
+
+## Examples
+
+??? example "Default behavior (macro not defined)"
+
+    Without the macro, single-element brace initialization wraps the value in an array:
+
+    ```cpp
+    #include <nlohmann/json.hpp>
+
+    using json = nlohmann::json;
+
+    int main()
+    {
+        json obj = {{"key", "value"}};
+
+        json j{obj};
+        // j is [{"key":"value"}]  -- single-element array, NOT a copy of obj
+    }
+    ```
+
+??? example "Opt-in copy semantics (macro defined to 1)"
+
+    With the macro, single-element brace initialization copies/moves the value:
+
+    ```cpp
+    #define JSON_BRACE_INIT_COPY_SEMANTICS 1
+    #include <nlohmann/json.hpp>
+
+    using json = nlohmann::json;
+
+    int main()
+    {
+        json obj = {{"key", "value"}};
+
+        json j{obj};
+        // j is {"key":"value"}  -- copy of obj
+    }
+    ```
+
+## See also
+
+- [FAQ: Brace initialization yields arrays](../../home/faq.md#brace-initialization-yields-arrays)
+- [**basic_json(initializer_list_t)**](../basic_json/basic_json.md) - the affected constructor
+
+## Version history
+
+- Added in version 3.12.0.
@@ -53,7 +53,7 @@ The default value is `0`.
        const json j = Choice::first; 

        // normally invokes from_json parse function but with JSON_DISABLE_ENUM_SERIALIZATION defined, it does not
-        Choice ch = j.template get<Choice>();
+        Choice ch = j.get<Choice>();
    }
    ```

@@ -86,7 +86,7 @@ The default value is `0`.
        const json j = Choice::first; 

        // uses user-defined from_json function defined by macro
-        Choice ch = j.template get<Choice>();
+        Choice ch = j.get<Choice>();
    }
    ```

@@ -109,7 +109,7 @@ The default value is `0`.

    void from_json(const json& j, Choice& ch)
    {
-        auto value = j.template get<std::string>();
+        auto value = j.get<std::string>();
        if (value == "first")
        {
            ch = Choice::first;
@@ -122,7 +122,7 @@ The default value is `0`.

    void to_json(json& j, const Choice& ch)
    {
-        auto value = j.template get<std::string>();
+        auto value = j.get<std::string>();
        if (value == "first")
        {
            ch = Choice::first;
@@ -139,7 +139,7 @@ The default value is `0`.
        const json j = Choice::first; 

        // uses user-defined from_json function
-        Choice ch = j.template get<Choice>();
+        Choice ch = j.get<Choice>();
    }
    ```

@@ -46,7 +46,7 @@ By default, implicit conversions are enabled.

    ```cpp
    json j = "Hello, world!";
-    auto s = j.template get<std::string>();
+    auto s = j.get<std::string>();
    ```

 ## See also
@@ -57,7 +57,7 @@ Summary:
 :   name of the base type (class, struct) `type` is derived from

 `member` (in)
-:   name of the member variable to serialize/deserialize; up to 64 members can be given as a comma-separated list
+:   name of the member variable to serialize/deserialize; up to 63 members can be given as a comma-separated list

 ## Default definition

@@ -33,7 +33,7 @@ Summary:
 :   name of the type (class, struct) to serialize/deserialize

 `member` (in)
-:   name of the member variable to serialize/deserialize; up to 64 members can be given as a comma-separated list
+:   name of the member variable to serialize/deserialize; up to 63 members can be given as a comma-separated list

 ## Default definition

@@ -60,8 +60,8 @@ See the examples below for the concrete generated code.

 !!! warning "Implementation limits"

-    - The current implementation is limited to at most 64 member variables. If you want to serialize/deserialize types
-      with more than 64 member variables, you need to define the `to_json`/`from_json` functions manually.
+    - The current implementation is limited to at most 63 member variables. If you want to serialize/deserialize types
+      with more than 63 member variables, you need to define the `to_json`/`from_json` functions manually.

 ## Examples

@@ -33,7 +33,7 @@ Summary:
 :   name of the type (class, struct) to serialize/deserialize

 `member` (in)
-:   name of the (public) member variable to serialize/deserialize; up to 64 members can be given as a comma-separated list
+:   name of the (public) member variable to serialize/deserialize; up to 63 members can be given as a comma-separated list

 ## Default definition

@@ -61,8 +61,8 @@ See the examples below for the concrete generated code.

 !!! warning "Implementation limits"

-    - The current implementation is limited to at most 64 member variables. If you want to serialize/deserialize types
-      with more than 64 member variables, you need to define the `to_json`/`from_json` functions manually.
+    - The current implementation is limited to at most 63 member variables. If you want to serialize/deserialize types
+      with more than 63 member variables, you need to define the `to_json`/`from_json` functions manually.

 ## Examples

@@ -0,0 +1,78 @@
+<h1>NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_NAMES, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT_WITH_NAMES,
+    NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_NAMES,
+    NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT_WITH_NAMES, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES,
+    NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_NAMES, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT_WITH_NAMES,
+    NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_NAMES,
+    NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT_WITH_NAMES, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES</h1>
+
+```cpp
+#define NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_NAMES(type, "json_member_name", member...)
+#define NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT_WITH_NAMES(type, "json_member_name", member...)
+#define NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES(type, "json_member_name", member...)
+#define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_NAMES(type, "json_member_name", member...)
+#define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT_WITH_NAMES(type, "json_member_name", member...)
+#define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES(type, "json_member_name", member...)
+#define NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_NAMES(type, base_type, "json_member_name", member...)
+#define NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT_WITH_NAMES(type, base_type, "json_member_name", member...)
+#define NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES(type, base_type, "json_member_name", member...)
+#define NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_NAMES(type, base_type, "json_member_name", member...)
+#define NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT_WITH_NAMES(type, base_type, "json_member_name", member...)
+#define NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES(type, base_type, "json_member_name", member...)
+```
+
+These macros can be used in case you want to use the custom names for the member variables in the resulting JSON.
+They behave exactly as their non-`WITH_NAMES` counterparts, but require an additional parameter for each member variable
+which will be used in JSON. Both serialization and deserialization will only use the custom names for JSON, the names of
+the member variables themselves will be ignored.
+
+Using the named conversion macros will halve the maximum number of member variables from 63 to 31.
+
+For further information please refer to the corresponding macros without `WITH_NAMES`.
+
+## Parameters
+
+`type` (in)
+:   name of the type (class, struct) to serialize/deserialize
+
+`base_type` (in)
+:   name of the base type (class, struct) `type` is derived from (used only in `DEFINE_DERIVED_TYPE` macros)
+
+`json_member_name` (in)
+:   the string that will be used as the name for the next value
+
+`member` (in)
+:   name of the member variable to serialize/deserialize
+
+## Examples
+
+??? example "Example (1): NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_NAMES"
+
+    Consider the following complete example:
+
+    ```cpp hl_lines="16"
+    --8<-- "examples/nlohmann_define_type_non_intrusive_with_names_macro.cpp"
+    ```
+    
+    Output:
+    
+    ```json
+    --8<-- "examples/nlohmann_define_type_non_intrusive_with_names_macro.output"
+    ```
+
+    Notes:
+
+    - `ns::person` is default-constructible. This is a requirement for using the macro.
+    - `ns::person` has only public member variables. This makes `NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_NAMES` applicable.
+    - The macro `NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_NAMES` is used _outside_ the class, but _inside_ its namespace `ns`.
+    - A missing key "age" in the deserialization yields an exception. To fall back to the default value,
+      `NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT_WITH_NAMES` can be used.
+
+    The macro is equivalent to:
+
+    ```cpp hl_lines="16 17 18 19 20 21 22 23 24 25 26 27 28"
+    --8<-- "examples/nlohmann_define_type_non_intrusive_with_names_explicit.cpp"
+    ```
+
+## Version history
+
+1. Added in version 3.11.x.
@@ -37,7 +37,7 @@ inline void from_json(const BasicJsonType& j, type& e);

 !!! important "Important notes"

-    - When using [`template get<ENUM_TYPE>()`](../basic_json/get.md), undefined JSON values will default to the first specified
+    - When using [`get<ENUM_TYPE>()`](../basic_json/get.md), undefined JSON values will default to the first specified
      conversion. Select this default pair carefully. See example 1 below.
    - If an enum or JSON value is specified in multiple conversions, the first matching conversion from the top of the
      list will be returned when converting to or from JSON. See example 2 below.
@@ -78,6 +78,7 @@ inline void from_json(const BasicJsonType& j, type& e);
 ## See also

 - [Specializing enum conversion](../../features/enum_conversion.md)
+- [`NLOHMANN_JSON_SERIALIZE_ENUM_STRICT`](./nlohmann_json_serialize_enum_strict.md)
 - [`JSON_DISABLE_ENUM_SERIALIZATION`](json_disable_enum_serialization.md)

 ## Version history
@@ -0,0 +1,102 @@
+# NLOHMANN_JSON_SERIALIZE_ENUM_STRICT
+
+```cpp
+#define NLOHMANN_JSON_SERIALIZE_ENUM_STRICT(type, 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 deserialized JSON data may be
+undefined or a different enum value than was originally intended.
+
+`NLOHMANN_JSON_SERIALIZE_ENUM_STRICT` allows to define a user-defined serialization for every enumerator that
+throws an exception on undefined input.
+
+## Parameters
+
+`type` (in)
+:   name of the enum to serialize/deserialize
+
+`conversion` (in)
+:   a pair of an enumerator and a JSON serialization; arbitrary pairs can be given as a comma-separated list
+
+## Default definition
+
+The macro adds two functions to the namespace which take care of the serialization and deserialization:
+
+```cpp
+template<typename BasicJsonType>
+inline void to_json(BasicJsonType& j, const type& e);
+template<typename BasicJsonType>
+inline void from_json(const BasicJsonType& j, type& e);
+```
+
+## Notes
+
+!!! info "Prerequisites"
+
+    The macro must be used inside the namespace of the enum.
+
+!!! important "Important notes"
+
+    - When using [`get<ENUM_TYPE>()`](../basic_json/get.md), undefined JSON values will throw an exception.
+    - If an enum or JSON value is specified in multiple conversions, the first matching conversion from the top of the
+      list will be returned when converting to or from JSON. See example 2 below.
+
+## Examples
+
+??? example "Example 1: Basic usage"
+
+    The example shows how `NLOHMANN_JSON_SERIALIZE_ENUM_STRICT` can be used to serialize/deserialize both classical enums and
+    C++11 enum classes:
+
+    ```cpp hl_lines="16 17 18 19 20 21 22 29 30 31 32 33"
+    --8<-- "examples/nlohmann_json_serialize_enum_strict.cpp"
+    ```
+
+    Output:
+    
+    ```json
+    --8<-- "examples/nlohmann_json_serialize_enum_strict.output"
+    ```
+
+??? example "Example 2: Multiple conversions for one enumerator"
+
+    The example shows how to use multiple conversions for a single enumerator. In the example, `Color::red` will always
+    be *serialized* to `"red"`, because the first occurring conversion. The second conversion, however, offers an
+    alternative *deserialization* from `"rot"` to `Color::red`.
+
+    ```cpp hl_lines="17"
+    --8<-- "examples/nlohmann_json_serialize_enum_strict_2.cpp"
+    ```
+
+    Output:
+    
+    ```json
+    --8<-- "examples/nlohmann_json_serialize_enum_strict_2.output"
+    ```
+
+??? example "Example 3: exceptions on invalid serialization"
+    
+    The example shows how an invalid serialization causes an exception to be thrown. In the example,
+    Color::unknown is not defined in the mapping used to call `NLOHMANN_JSON_SERIALIZE_ENUM_STRICT`
+    so causes an exception when used to serialize. Similarly, "what" does not refer to an enum
+    value so also causes an exception when deserialization is attempted.
+
+    ```cpp hl_lines="14 32 33 43 44 45"
+    --8<-- "examples/nlohmann_json_serialize_enum_strict_err.cpp"
+    ```
+
+    Output:
+    ```json
+    --8<-- "examples/nlohmann_json_serialize_enum_strict_err.output"
+    ```
+
+## See also
+
+- [Specializing enum conversion](../../features/enum_conversion.md)
+- [`NLOHMANN_JSON_SERIALIZE_ENUM`](./nlohmann_json_serialize_enum.md)
+- [`JSON_DISABLE_ENUM_SERIALIZATION`](json_disable_enum_serialization.md)
+
+## Version history
+
+Added in version 3.12.0.
@@ -2,6 +2,7 @@

 ```cpp
 json operator ""_json(const char* s, std::size_t n);
+json operator ""_json(const char8_t* s, std::size_t n);  // since C++20
 ```

 This operator implements a user-defined string literal for JSON objects. It can be used by adding `#!cpp _json` to a
@@ -59,3 +60,4 @@ Linear.

 - Added in version 1.0.0.
 - Moved to namespace `nlohmann::literals::json_literals` in 3.11.0.
+- Added `char8_t*` overload in 3.12.1.
@@ -2,6 +2,7 @@

 ```cpp
 json_pointer operator ""_json_pointer(const char* s, std::size_t n);
+json_pointer operator ""_json_pointer(const char8_t* s, std::size_t n);  // since C++20
 ```

 This operator implements a user-defined string literal for JSON Pointers. It can be used by adding `#!cpp _json_pointer`
@@ -62,3 +63,4 @@ Linear.

 - Added in version 2.0.0.
 - Moved to namespace `nlohmann::literals::json_literals` in 3.11.0.
+- Added `char8_t*` overload in 3.12.1.
@@ -15,81 +15,83 @@ violations will result in a failed build.

    ??? abstract "Compilers used in continuous integration"
      
-        | Compiler                                     | Architecture | Operating System         | CI        |
-        |----------------------------------------------|--------------|--------------------------|-----------|
-        | AppleClang 14.0.0.14000029; Xcode 14.1       | x86_64       | macOS 13.7.2 (Ventura)   | GitHub    |
-        | AppleClang 14.0.0.14000029; Xcode 14.2       | x86_64       | macOS 13.7.2 (Ventura)   | GitHub    |
-        | AppleClang 14.0.3.14030022; Xcode 14.3.1     | x86_64       | macOS 13.7.2 (Ventura)   | GitHub    |
-        | AppleClang 15.0.0.15000040; Xcode 15.0.1     | x86_64       | macOS 13.7.2 (Ventura)   | GitHub    |
-        | AppleClang 15.0.0.15000100; Xcode 15.1       | x86_64       | macOS 13.7.2 (Ventura)   | GitHub    |
-        | AppleClang 15.0.0.15000100; Xcode 15.2       | x86_64       | macOS 13.7.2 (Ventura)   | GitHub    |
-        | AppleClang 15.0.0.15000309; Xcode 15.3       | arm64        | macOS 14.7.2 (Sonoma)    | GitHub    |
-        | AppleClang 15.0.0.15000309; Xcode 15.4       | arm64        | macOS 14.7.2 (Sonoma)    | GitHub    |
-        | AppleClang 16.0.0.16000026; Xcode 16         | arm64        | macOS 15.2 (Sequoia)     | GitHub    |
-        | AppleClang 16.0.0.16000026; Xcode 16.1       | arm64        | macOS 15.2 (Sequoia)     | GitHub    |
-        | AppleClang 16.0.0.16000026; Xcode 16.2       | arm64        | macOS 15.2 (Sequoia)     | GitHub    |
-        | Clang 3.5.2                                  | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 3.6.2                                  | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 3.7.1                                  | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 3.8.1                                  | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 3.9.1                                  | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 4.0.1                                  | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 5.0.2                                  | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 6.0.1                                  | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 7.1.0                                  | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 8.0.1                                  | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 9.0.1                                  | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 10.0.1                                 | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 11.0.0 with GNU-like command-line      | x86_64       | Windows 10 (Build 17763) | GitHub    |
-        | Clang 11.1.0                                 | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 12.0.0 with GNU-like command-line      | x86_64       | Windows 10 (Build 17763) | GitHub    |
-        | Clang 12.0.0 with MSVC-like command-line     | x86_64       | Windows 10 (Build 17763) | GitHub    |
-        | Clang 12.0.1                                 | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 13.0.0 with GNU-like command-line      | x86_64       | Windows 10 (Build 17763) | GitHub    |
-        | Clang 13.0.1                                 | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 14.0.0 with GNU-like command-line      | x86_64       | Windows 10 (Build 17763) | GitHub    |
-        | Clang 14.0.6                                 | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 15.0.0 with GNU-like command-line      | x86_64       | Windows 10 (Build 17763) | GitHub    |
-        | Clang 15.0.7                                 | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 16.0.6                                 | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 17.0.6                                 | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 18.1.8                                 | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 19.1.7                                 | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 20.1.1                                 | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Clang 21.0.0                                 | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | Emscripten 4.0.6                             | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 4.8.5                                    | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 4.9.3                                    | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 5.5.0                                    | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 6.4.0                                    | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 7.5.0                                    | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 8.5.0                                    | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 9.3.0                                    | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 9.4.0                                    | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 9.5.0                                    | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 10.5.0                                   | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 11.4.0                                   | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 11.5.0                                   | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 12.2.0 (MinGW-W64 i686-ucrt-posix-dwarf) | x86_64       | Windows 10 (Build 17763) | GitHub    |
-        | GNU 12.2.0 (MinGW-W64 x86_64-ucrt-posix-seh) | x86_64       | Windows 10 (Build 17763) | GitHub    |
-        | GNU 12.4.0                                   | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 13.3.0                                   | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 14.2.0                                   | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | GNU 14.2.0                                   | arm64        | Linux 6.1.100            | Cirrus CI |
-        | GNU 15.1.0                                   | x86_64       | Ubuntu 22.04.1 LTS       | GitHub    |
-        | icpc (ICC) 2021.5.0 20211109                 | x86_64       | Ubuntu 20.04.3 LTS       | GitHub    |
-        | MSVC 19.0.24241.7                            | x86          | Windows 8.1              | AppVeyor  |
-        | MSVC 19.16.27035.0                           | x86          | Windows-10 (Build 14393) | AppVeyor  |
-        | MSVC 19.29.30157.0                           | x86          | Windows 10 (Build 17763) | GitHub    |
-        | MSVC 19.29.30157.0                           | x86_64       | Windows 10 (Build 17763) | GitHub    |
-        | MSVC 19.29.30157.0                           | x86          | Windows-10 (Build 17763) | AppVeyor  |
-        | MSVC 19.42.34435.0                           | x86          | Windows 10 (Build 20348) | GitHub    |
-        | MSVC 19.42.34435.0                           | x86_64       | Windows 10 (Build 20348) | GitHub    |
+        | Compiler                                     | Architecture | Operating System                  | CI        |
+        |----------------------------------------------|--------------|-----------------------------------|-----------|
+        | AppleClang 15.0.0.15000040; Xcode 15.0.1     | x86_64       | macOS 13.7.2 (Ventura)            | GitHub    |
+        | AppleClang 15.0.0.15000100; Xcode 15.1       | x86_64       | macOS 13.7.2 (Ventura)            | GitHub    |
+        | AppleClang 15.0.0.15000100; Xcode 15.2       | x86_64       | macOS 13.7.2 (Ventura)            | GitHub    |
+        | AppleClang 15.0.0.15000309; Xcode 15.3       | arm64        | macOS 14.7.2 (Sonoma)             | GitHub    |
+        | AppleClang 15.0.0.15000309; Xcode 15.4       | arm64        | macOS 14.7.2 (Sonoma)             | GitHub    |
+        | AppleClang 16.0.0.16000026; Xcode 16         | arm64        | macOS 15.2 (Sequoia)              | GitHub    |
+        | AppleClang 16.0.0.16000026; Xcode 16.1       | arm64        | macOS 15.2 (Sequoia)              | GitHub    |
+        | AppleClang 16.0.0.16000026; Xcode 16.2       | arm64        | macOS 15.2 (Sequoia)              | GitHub    |
+        | AppleClang 17.0.0.17000013; Xcode 16.3       | arm64        | macOS 15.5 (Sequoia)              | GitHub    |
+        | AppleClang 17.0.0.17000013; Xcode 16.4       | arm64        | macOS 15.5 (Sequoia)              | GitHub    |
+        | AppleClang 17.0.0.17000319; Xcode 26.0.1     | arm64        | macOS 15.5 (Sequoia)              | GitHub    |
+        | Clang 3.5.2                                  | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 3.6.2                                  | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 3.7.1                                  | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 3.8.1                                  | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 3.9.1                                  | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 4.0.1                                  | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 5.0.2                                  | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 6.0.1                                  | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 7.1.0                                  | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 8.0.1                                  | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 9.0.1                                  | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 10.0.1                                 | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 11.0.1 with GNU-like command-line      | x86_64       | Windows Server 2022 (Build 20348) | GitHub    |
+        | Clang 11.1.0                                 | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 12.0.1 with GNU-like command-line      | x86_64       | Windows Server 2022 (Build 20348) | GitHub    |
+        | Clang 12.0.1                                 | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 13.0.1 with GNU-like command-line      | x86_64       | Windows Server 2022 (Build 20348) | GitHub    |
+        | Clang 13.0.1                                 | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 14.0.6                                 | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 14.0.6 with GNU-like command-line      | x86_64       | Windows Server 2022 (Build 20348) | GitHub    |
+        | Clang 15.0.7                                 | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 15.0.7 with GNU-like command-line      | x86_64       | Windows Server 2022 (Build 20348) | GitHub    |
+        | Clang 16.0.6                                 | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 16.0.6 with GNU-like command-line      | x86_64       | Windows Server 2022 (Build 20348) | GitHub    |
+        | Clang 17.0.6                                 | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 18.1.8                                 | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 18.1.8 with GNU-like command-line      | x86_64       | Windows Server 2022 (Build 20348) | GitHub    |
+        | Clang 19.1.5 with MSVC-like command-line     | x86_64       | Windows Server 2022 (Build 20348) | GitHub    |
+        | Clang 19.1.7                                 | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 19.1.7 with GNU-like command-line      | x86_64       | Windows Server 2022 (Build 20348) | GitHub    |
+        | Clang 20.1.1                                 | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Clang 20.1.8 with GNU-like command-line      | x86_64       | Windows Server 2022 (Build 20348) | GitHub    |
+        | Clang 21.0.0                                 | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | Emscripten 4.0.6                             | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 4.8.5                                    | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 4.9.3                                    | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 5.5.0                                    | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 6.4.0                                    | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 7.5.0                                    | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 8.5.0                                    | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 9.3.0                                    | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 9.4.0                                    | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 9.5.0                                    | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 10.5.0                                   | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 11.4.0                                   | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 11.5.0                                   | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 12.2.0 (MinGW-W64 i686-ucrt-posix-dwarf) | x86_64       | Windows Server 2022 (Build 20348) | GitHub    |
+        | GNU 12.2.0 (MinGW-W64 x86_64-ucrt-posix-seh) | x86_64       | Windows Server 2022 (Build 20348) | GitHub    |
+        | GNU 12.4.0                                   | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 13.3.0                                   | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 14.2.0                                   | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | GNU 14.2.0                                   | arm64        | Linux 6.1.100                     | Cirrus CI |
+        | GNU 15.1.0                                   | x86_64       | Ubuntu 22.04.1 LTS                | GitHub    |
+        | icpc (ICC) 2021.5.0 20211109                 | x86_64       | Ubuntu 20.04.3 LTS                | GitHub    |
+        | MSVC 19.0.24241.7                            | x86          | Windows 8.1                       | AppVeyor  |
+        | MSVC 19.16.27035.0                           | x86          | Windows-10 (Build 14393)          | AppVeyor  |
+        | MSVC 19.29.30157.0                           | x86          | Windows-10 (Build 17763)          | AppVeyor  |
+        | MSVC 19.44.35214.0                           | x86          | Windows Server 2022 (Build 20348) | GitHub    |
+        | MSVC 19.44.35214.0                           | x86_64       | Windows Server 2022 (Build 20348) | GitHub    |

 - [x] The library is compiled with all C++ language revisions (C++11, C++14, C++17, C++20, C++23, and C++26) to detect
  and fix language deprecations early.
 - [x] The library is checked for compiler warnings:
-  - On Clang, `-Weverything` is used with 7 exceptions.
+  - On Clang, `-Weverything` is used with 8 exceptions.

    ??? abstract "Clang warnings"

@@ -5,7 +5,7 @@

 using json = nlohmann::json;

-/* Demonstration of type error exception with diagnostic postions support enabled */
+/* Demonstration of type error exception with diagnostic positions support enabled */
 int main()
 {
    //Invalid json string - housenumber type must be int instead of string
@@ -6,7 +6,7 @@

 using json = nlohmann::json;

-/* Demonstration of type error exception with diagnostic postions support enabled */
+/* Demonstration of type error exception with diagnostic positions support enabled */
 int main()
 {
    //Invalid json string - housenumber type must be int instead of string
@@ -31,7 +31,7 @@ int main()
    j["address"] = "744 Evergreen Terrace";
    j["age"] = 60;

-    auto p = j.template get<ns::person>();
+    auto p = j.get<ns::person>();

    std::cout << p.name << " (" << p.age << ") lives in " << p.address << std::endl;
 }
@@ -47,7 +47,7 @@ int main()
    j["address"] = "744 Evergreen Terrace";
    j["age"] = 60;

-    auto p = j.template get<ns::person>();
+    auto p = j.get<ns::person>();

    std::cout << p.name << " (" << p.age << ") lives in " << p.address << std::endl;
 }
@@ -9,11 +9,11 @@ int main()
    json value = 17;

    // explicitly getting pointers
-    auto p1 = value.template get<const json::number_integer_t*>();
-    auto p2 = value.template get<json::number_integer_t*>();
-    auto p3 = value.template get<json::number_integer_t* const>();
-    auto p4 = value.template get<const json::number_integer_t* const>();
-    auto p5 = value.template get<json::number_float_t*>();
+    auto p1 = value.get<const json::number_integer_t*>();
+    auto p2 = value.get<json::number_integer_t*>();
+    auto p3 = value.get<json::number_integer_t* const>();
+    auto p4 = value.get<const json::number_integer_t* const>();
+    auto p5 = value.get<json::number_float_t*>();

    // print the pointees
    std::cout << *p1 << ' ' << *p2 << ' ' << *p3 << ' ' << *p4 << '\n';
@@ -22,14 +22,14 @@ int main()
    };

    // use explicit conversions
-    auto v1 = json_types["boolean"].template get<bool>();
-    auto v2 = json_types["number"]["integer"].template get<int>();
-    auto v3 = json_types["number"]["integer"].template get<short>();
-    auto v4 = json_types["number"]["floating-point"].template get<float>();
-    auto v5 = json_types["number"]["floating-point"].template get<int>();
-    auto v6 = json_types["string"].template get<std::string>();
-    auto v7 = json_types["array"].template get<std::vector<short>>();
-    auto v8 = json_types.template get<std::unordered_map<std::string, json>>();
+    auto v1 = json_types["boolean"].get<bool>();
+    auto v2 = json_types["number"]["integer"].get<int>();
+    auto v3 = json_types["number"]["integer"].get<short>();
+    auto v4 = json_types["number"]["floating-point"].get<float>();
+    auto v5 = json_types["number"]["floating-point"].get<int>();
+    auto v6 = json_types["string"].get<std::string>();
+    auto v7 = json_types["array"].get<std::vector<short>>();
+    auto v8 = json_types.get<std::unordered_map<std::string, json>>();

    // print the conversion results
    std::cout << v1 << '\n';
@@ -0,0 +1,15 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // different JSON Pointers
+    json::json_pointer ptr1("/foo");
+    json::json_pointer ptr2("/foo/0");
+
+    // call empty()
+    std::cout << "first reference token of \"" << ptr1 << "\" is \"" << ptr1.front() << "\"\n"
+              << "first reference token of \"" << ptr2 << "\" is \"" << ptr2.front() << "\"" << std::endl;
+}
@@ -0,0 +1,2 @@
+first reference token of "/foo" is "foo"
+first reference token of "/foo/0" is "foo"
@@ -0,0 +1,21 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create empty JSON Pointer
+    json::json_pointer ptr("/foo/bar/baz");
+    std::cout << "\"" << ptr << "\"\n";
+
+    // call pop_front()
+    ptr.pop_front();
+    std::cout << "\"" << ptr << "\"\n";
+
+    ptr.pop_front();
+    std::cout << "\"" << ptr << "\"\n";
+
+    ptr.pop_front();
+    std::cout << "\"" << ptr << "\"\n";
+}
@@ -0,0 +1,4 @@
+"/foo/bar/baz"
+"/bar/baz"
+"/baz"
+""
@@ -0,0 +1,21 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create empty JSON Pointer
+    json::json_pointer ptr;
+    std::cout << "\"" << ptr << "\"\n";
+
+    // call push_front()
+    ptr.push_front("foo");
+    std::cout << "\"" << ptr << "\"\n";
+
+    ptr.push_front("0");
+    std::cout << "\"" << ptr << "\"\n";
+
+    ptr.push_front("bar");
+    std::cout << "\"" << ptr << "\"\n";
+}
@@ -0,0 +1,4 @@
+""
+"/foo"
+"/0/foo"
+"/bar/0/foo"
@@ -4,7 +4,7 @@
        "family": "gcc",
        "version": "12.4.0"
    },
-    "copyright": "(C) 2013-2025 Niels Lohmann",
+    "copyright": "(C) 2013-2026 Niels Lohmann",
    "name": "JSON for Modern C++",
    "platform": "apple",
    "url": "https://github.com/nlohmann/json",
@@ -47,13 +47,13 @@ int main()

    // deserialization: json -> person
    json j2 = R"({"address": "742 Evergreen Terrace", "age": 40, "name": "Homer Simpson"})"_json;
-    auto p2 = j2.template get<ns::person>();
+    auto p2 = j2.get<ns::person>();

    // incomplete deserialization:
    json j3 = R"({"address": "742 Evergreen Terrace", "name": "Maggie Simpson"})"_json;
    try
    {
-        auto p3 = j3.template get<ns::person>();
+        auto p3 = j3.get<ns::person>();
    }
    catch (const json::exception& e)
    {
@@ -33,13 +33,13 @@ int main()

    // deserialization: json -> person
    json j2 = R"({"address": "742 Evergreen Terrace", "age": 40, "name": "Homer Simpson"})"_json;
-    auto p2 = j2.template get<ns::person>();
+    auto p2 = j2.get<ns::person>();

    // incomplete deserialization:
    json j3 = R"({"address": "742 Evergreen Terrace", "name": "Maggie Simpson"})"_json;
    try
    {
-        auto p3 = j3.template get<ns::person>();
+        auto p3 = j3.get<ns::person>();
    }
    catch (const json::exception& e)
    {
@@ -48,10 +48,10 @@ int main()

    // deserialization: json -> person
    json j2 = R"({"address": "742 Evergreen Terrace", "age": 40, "name": "Homer Simpson"})"_json;
-    auto p2 = j2.template get<ns::person>();
+    auto p2 = j2.get<ns::person>();

    // incomplete deserialization:
    json j3 = R"({"address": "742 Evergreen Terrace", "name": "Maggie Simpson"})"_json;
-    auto p3 = j3.template get<ns::person>();
+    auto p3 = j3.get<ns::person>();
    std::cout << "roundtrip: " << json(p3) << std::endl;
 }
@@ -33,10 +33,10 @@ int main()

    // deserialization: json -> person
    json j2 = R"({"address": "742 Evergreen Terrace", "age": 40, "name": "Homer Simpson"})"_json;
-    auto p2 = j2.template get<ns::person>();
+    auto p2 = j2.get<ns::person>();

    // incomplete deserialization:
    json j3 = R"({"address": "742 Evergreen Terrace", "name": "Maggie Simpson"})"_json;
-    auto p3 = j3.template get<ns::person>();
+    auto p3 = j3.get<ns::person>();
    std::cout << "roundtrip: " << json(p3) << std::endl;
 }
@@ -40,13 +40,13 @@ int main()

    // deserialization: json -> person
    json j2 = R"({"address": "742 Evergreen Terrace", "age": 40, "name": "Homer Simpson"})"_json;
-    auto p2 = j2.template get<ns::person>();
+    auto p2 = j2.get<ns::person>();

    // incomplete deserialization:
    json j3 = R"({"address": "742 Evergreen Terrace", "name": "Maggie Simpson"})"_json;
    try
    {
-        auto p3 = j3.template get<ns::person>();
+        auto p3 = j3.get<ns::person>();
    }
    catch (const json::exception& e)
    {
@@ -26,13 +26,13 @@ int main()

    // deserialization: json -> person
    json j2 = R"({"address": "742 Evergreen Terrace", "age": 40, "name": "Homer Simpson"})"_json;
-    auto p2 = j2.template get<ns::person>();
+    auto p2 = j2.get<ns::person>();

    // incomplete deserialization:
    json j3 = R"({"address": "742 Evergreen Terrace", "name": "Maggie Simpson"})"_json;
    try
    {
-        auto p3 = j3.template get<ns::person>();
+        auto p3 = j3.get<ns::person>();
    }
    catch (const json::exception& e)
    {
@@ -46,10 +46,10 @@ int main()

    // deserialization: json -> person
    json j2 = R"({"address": "742 Evergreen Terrace", "age": 40, "name": "Homer Simpson"})"_json;
-    auto p2 = j2.template get<ns::person>();
+    auto p2 = j2.get<ns::person>();

    // incomplete deserialization:
    json j3 = R"({"address": "742 Evergreen Terrace", "name": "Maggie Simpson"})"_json;
-    auto p3 = j3.template get<ns::person>();
+    auto p3 = j3.get<ns::person>();
    std::cout << "roundtrip: " << json(p3) << std::endl;
 }
@@ -31,10 +31,10 @@ int main()

    // deserialization: json -> person
    json j2 = R"({"address": "742 Evergreen Terrace", "age": 40, "name": "Homer Simpson"})"_json;
-    auto p2 = j2.template get<ns::person>();
+    auto p2 = j2.get<ns::person>();

    // incomplete deserialization:
    json j3 = R"({"address": "742 Evergreen Terrace", "name": "Maggie Simpson"})"_json;
-    auto p3 = j3.template get<ns::person>();
+    auto p3 = j3.get<ns::person>();
    std::cout << "roundtrip: " << json(p3) << std::endl;
 }
@@ -0,0 +1,55 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+using namespace nlohmann::literals;
+
+namespace ns
+{
+struct person
+{
+    std::string name;
+    std::string address;
+    int age;
+};
+
+template <typename BasicJsonType, nlohmann::detail::enable_if_t<nlohmann::detail::is_basic_json<BasicJsonType>::value, int> = 0>
+void to_json(BasicJsonType& nlohmann_json_j, const person& nlohmann_json_t)
+{
+    nlohmann_json_j["json_name"] = nlohmann_json_t.name;
+    nlohmann_json_j["json_address"] = nlohmann_json_t.address;
+    nlohmann_json_j["json_age"] = nlohmann_json_t.age;
+}
+
+template <typename BasicJsonType, nlohmann::detail::enable_if_t<nlohmann::detail::is_basic_json<BasicJsonType>::value, int> = 0>
+void from_json(const BasicJsonType& nlohmann_json_j, person& nlohmann_json_t)
+{
+    nlohmann_json_j.at("json_name").get_to(nlohmann_json_t.name);
+    nlohmann_json_j.at("json_address").get_to(nlohmann_json_t.address);
+    nlohmann_json_j.at("json_age").get_to(nlohmann_json_t.age);
+}
+} // namespace ns
+
+int main()
+{
+    ns::person p = {"Ned Flanders", "744 Evergreen Terrace", 60};
+
+    // serialization: person -> json
+    json j = p;
+    std::cout << "serialization: " << j << std::endl;
+
+    // deserialization: json -> person
+    json j2 = R"({"json_address": "742 Evergreen Terrace", "json_age": 40, "json_name": "Homer Simpson"})"_json;
+    auto p2 = j2.template get<ns::person>();
+
+    // incomplete deserialization:
+    json j3 = R"({"json_address": "742 Evergreen Terrace", "json_name": "Maggie Simpson"})"_json;
+    try
+    {
+        auto p3 = j3.template get<ns::person>();
+    }
+    catch (const json::exception& e)
+    {
+        std::cout << "deserialization failed: " << e.what() << std::endl;
+    }
+}
@@ -0,0 +1,2 @@
+serialization: {"json_address":"744 Evergreen Terrace","json_age":60,"json_name":"Ned Flanders"}
+deserialization failed: [json.exception.out_of_range.403] key 'json_age' not found
@@ -0,0 +1,41 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+using namespace nlohmann::literals;
+
+namespace ns
+{
+struct person
+{
+    std::string name;
+    std::string address;
+    int age;
+};
+
+NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_NAMES(person, "json_name", name, "json_address", address, "json_age", age)
+} // namespace ns
+
+int main()
+{
+    ns::person p = {"Ned Flanders", "744 Evergreen Terrace", 60};
+
+    // serialization: person -> json
+    json j = p;
+    std::cout << "serialization: " << j << std::endl;
+
+    // deserialization: json -> person
+    json j2 = R"({"json_address": "742 Evergreen Terrace", "json_age": 40, "json_name": "Homer Simpson"})"_json;
+    auto p2 = j2.template get<ns::person>();
+
+    // incomplete deserialization:
+    json j3 = R"({"json_address": "742 Evergreen Terrace", "json_name": "Maggie Simpson"})"_json;
+    try
+    {
+        auto p3 = j3.template get<ns::person>();
+    }
+    catch (const json::exception& e)
+    {
+        std::cout << "deserialization failed: " << e.what() << std::endl;
+    }
+}
@@ -0,0 +1,2 @@
+serialization: {"json_address":"744 Evergreen Terrace","json_age":60,"json_name":"Ned Flanders"}
+deserialization failed: [json.exception.out_of_range.403] key 'json_age' not found
@@ -44,16 +44,16 @@ int main()
    // deserialization
    json j_running = "running";
    json j_blue = "blue";
-    auto running = j_running.template get<ns::TaskState>();
-    auto blue = j_blue.template get<ns::Color>();
+    auto running = j_running.get<ns::TaskState>();
+    auto blue = j_blue.get<ns::Color>();
    std::cout << j_running << " -> " << running
              << ", " << j_blue << " -> " << static_cast<int>(blue) << std::endl;

    // deserializing undefined JSON value to enum
    // (where the first map entry above is the default)
    json j_pi = 3.14;
-    auto invalid = j_pi.template get<ns::TaskState>();
-    auto unknown = j_pi.template get<ns::Color>();
+    auto invalid = j_pi.get<ns::TaskState>();
+    auto unknown = j_pi.get<ns::Color>();
    std::cout << j_pi << " -> " << invalid << ", "
              << j_pi << " -> " << static_cast<int>(unknown) << std::endl;
 }
@@ -26,8 +26,8 @@ int main()

    // deserialization
    json j_rot = "rot";
-    auto rot = j_rot.template get<ns::Color>();
-    auto red = j_red.template get<ns::Color>();
+    auto rot = j_rot.get<ns::Color>();
+    auto red = j_red.get<ns::Color>();
    std::cout << j_rot << " -> " << static_cast<int>(rot) << std::endl;
    std::cout << j_red << " -> " << static_cast<int>(red) << std::endl;
 }
@@ -0,0 +1,52 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+namespace ns
+{
+enum TaskState
+{
+    TS_STOPPED,
+    TS_RUNNING,
+    TS_COMPLETED,
+    TS_INVALID = -1
+};
+
+NLOHMANN_JSON_SERIALIZE_ENUM_STRICT(TaskState,
+{
+    { TS_INVALID, nullptr },
+    { TS_STOPPED, "stopped" },
+    { TS_RUNNING, "running" },
+    { TS_COMPLETED, "completed" }
+})
+
+enum class Color
+{
+    red, green, blue, unknown
+};
+
+NLOHMANN_JSON_SERIALIZE_ENUM_STRICT(Color,
+{
+    { Color::unknown, "unknown" }, { Color::red, "red" },
+    { Color::green, "green" }, { Color::blue, "blue" }
+})
+} // namespace ns
+
+int main()
+{
+    // serialization
+    json j_stopped = ns::TS_STOPPED;
+    json j_red = ns::Color::red;
+    std::cout << "ns::TS_STOPPED -> " << j_stopped
+              << ", ns::Color::red -> " << j_red << std::endl;
+
+    // deserialization
+    json j_running = "running";
+    json j_blue = "blue";
+    auto running = j_running.get<ns::TaskState>();
+    auto blue = j_blue.get<ns::Color>();
+    std::cout << j_running << " -> " << running
+              << ", " << j_blue << " -> " << static_cast<int>(blue) << std::endl;
+
+}
@@ -0,0 +1,2 @@
+ns::TS_STOPPED -> "stopped", ns::Color::red -> "red"
+"running" -> 1, "blue" -> 2
@@ -0,0 +1,33 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+namespace ns
+{
+enum class Color
+{
+    red, green, blue, unknown
+};
+
+NLOHMANN_JSON_SERIALIZE_ENUM_STRICT(Color,
+{
+    { Color::unknown, "unknown" }, { Color::red, "red" },
+    { Color::green, "green" }, { Color::blue, "blue" },
+    { Color::red, "rot" } // a second conversion for Color::red
+})
+}
+
+int main()
+{
+    // serialization
+    json j_red = ns::Color::red;
+    std::cout << static_cast<int>(ns::Color::red) << " -> " << j_red << std::endl;
+
+    // deserialization
+    json j_rot = "rot";
+    auto rot = j_rot.get<ns::Color>();
+    auto red = j_red.get<ns::Color>();
+    std::cout << j_rot << " -> " << static_cast<int>(rot) << std::endl;
+    std::cout << j_red << " -> " << static_cast<int>(red) << std::endl;
+}
@@ -0,0 +1,3 @@
+0 -> "red"
+"rot" -> 0
+"red" -> 0
@@ -0,0 +1,53 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+namespace ns
+{
+
+enum class Color
+{
+    red,
+    green,
+    blue,
+    unknown // not mapped in JSON_SERIALIZE_ENUM_STRICT
+};
+
+NLOHMANN_JSON_SERIALIZE_ENUM_STRICT(Color,
+{
+    {Color::red, "red"},
+    {Color::green, "green"},
+    {Color::blue, "blue"}
+})
+
+} // namespace ns
+
+
+int main()
+{
+    // invalid serialization
+    try
+    {
+        // ns::color::unknown was not mapped in macro
+        json invalid_serialization = ns::Color::unknown;
+    }
+    catch (const json::exception e)
+    {
+        std::cout << "deserialization failed: " << e.what() << std::endl;
+    }
+
+    // invalid deserialization
+    try
+    {
+        // what does not map to an enum
+        json invalid_deserialization("what");
+        ns::Color color = invalid_deserialization.get<ns::Color>();
+    }
+    catch (const json::exception e)
+    {
+        std::cout << "deserialization failed: " << e.what() << std::endl;
+    }
+
+    return 0;
+}
@@ -0,0 +1,2 @@
+deserialization failed: [json.exception.out_of_range.410] enum value out of range for Color
+deserialization failed: [json.exception.out_of_range.410] enum value out of range for Color: "what"
@@ -5,7 +5,7 @@ using json = nlohmann::json;

 int main()
 {
-    // create JSON poiner
+    // create JSON pointer
    json::json_pointer ptr("/foo/bar/baz");

    // write string representation to stream
@@ -10,5 +10,5 @@ int main()
    std::cout << "operator[]:                " << j["uint64"] << '\n'
              << "default value (int):       " << j.value("uint64", 0) << '\n'
              << "default value (uint64_t):  " << j.value("uint64", std::uint64_t(0)) << '\n'
-              << "explict return value type: " << j.value<std::uint64_t>("uint64", 0) << '\n';
+              << "explicit return value type: " << j.value<std::uint64_t>("uint64", 0) << '\n';
 }
@@ -1,4 +1,4 @@
 operator[]:                18446744073709551615
 default value (int):       -1
 default value (uint64_t):  18446744073709551615
-explict return value type: 18446744073709551615
+explicit return value type: 18446744073709551615
@@ -24,9 +24,9 @@ j["age"] = p.age;

 // convert from JSON: copy each value from the JSON object
 ns::person p {
-    j["name"].template get<std::string>(),
-    j["address"].template get<std::string>(),
-    j["age"].template get<int>()
+    j["name"].get<std::string>(),
+    j["address"].get<std::string>(),
+    j["age"].get<int>()
 };
 ```

@@ -43,7 +43,7 @@ std::cout << j << std::endl;
 // {"address":"744 Evergreen Terrace","age":60,"name":"Ned Flanders"}

 // conversion: json -> person
-auto p2 = j.template get<ns::person>();
+auto p2 = j.get<ns::person>();

 // that's it
 assert(p == p2);
@@ -70,13 +70,13 @@ namespace ns {
 ```

 That's all! When calling the `json` constructor with your type, your custom `to_json` method will be automatically called.
-Likewise, when calling `template get<your_type>()` or `get_to(your_type&)`, the `from_json` method will be called.
+Likewise, when calling `get<your_type>()` or `get_to(your_type&)`, the `from_json` method will be called.

 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 [#1108](https://github.com/nlohmann/json/issues/1108) for errors that may occur otherwise.
-* When using `template 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.)
+* 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()`](../api/basic_json/at.md) 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.

@@ -85,16 +85,18 @@ Some important things:

 If you just want to serialize/deserialize some structs, the `to_json`/`from_json` functions can be a lot of boilerplate.

-There are six 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 several macros to make your life easier as long as you want to use a JSON object as serialization. The macros are following the naming pattern, and you can chose the macro based on the needed features:

- [`NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(name, member1, member2, ...)`](../api/macros/nlohmann_define_type_non_intrusive.md) is to be defined inside the namespace of the class/struct to create code for. It will throw an exception in `from_json()` due to a missing value in the JSON object.
- [`NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(name, member1, member2, ...)`](../api/macros/nlohmann_define_type_non_intrusive.md) is to be defined inside the namespace of the class/struct to create code for. It will not throw an exception in `from_json()` due to a missing value in the JSON object, but fills in values from an object which is default-constructed by the type.
- [`NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE(name, member1, member2, ...)`](../api/macros/nlohmann_define_type_non_intrusive.md) is to be defined inside the namespace of the class/struct to create code for. It does not define a `from_json()` function which is needed in case the type does not have a default constructor.
- [`NLOHMANN_DEFINE_TYPE_INTRUSIVE(name, member1, member2, ...)`](../api/macros/nlohmann_define_type_intrusive.md) is to be defined inside the class/struct to create code for. This macro can also access private members. It will throw an exception in `from_json()` due to a missing value in the JSON object.
- [`NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT(name, member1, member2, ...)`](../api/macros/nlohmann_define_type_intrusive.md) is to be defined inside the class/struct to create code for. This macro can also access private members. It will not throw an exception in `from_json()` due to a missing value in the JSON object, but fills in values from an object which is default-constructed by the type.
- [`NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE(name, member1, member2, ...)`](../api/macros/nlohmann_define_type_intrusive.md) is to be defined inside the class/struct to create code for. This macro can also access private members. It does not define a `from_json()` function which is needed in case the type does not have a default constructor.
+- All the macros start with `NLOHMANN_DEFINE`.
+- If you want a macro for the derived object, use the [`DERIVED_TYPE`](../api/macros/nlohmann_define_derived_type.md) variant, otherwise use `TYPE`.
+    - The `DERIVED_TYPE` variant requires an additional parameter of a base type, which should have the `to_json`/`from_json` functions defined. For instance, with a macro of its own.
+- If you need access to the private fields use [`INTRUSIVE`](../api/macros/nlohmann_define_type_intrusive.md) variant, otherwise use [`NON_INTRUSIVE`](../api/macros/nlohmann_define_type_non_intrusive.md).
+    - The `INTRUSIVE` macro should be defined **inside** the target class/struct, `NON_INTRUSIVE` should be defined within the same namespace.
+- If you want to deserialize the incomplete JSONs, use the `WITH_DEFAULTS` variant, which will use the default values for the member variables absent in JSON, the variant without `WITH_DEFAULTS` will raise an exception.
+- If you do not need deserialization at all and only interested in `to_json` function, you can use the `ONLY_SERIALIZE` variant.
+- If you want to use the custom JSON names for member variables, use [`WITH_NAMES`](../api/macros/nlohmann_define_type_with_names.md) variant, otherwise the JSON name of the variable will be the same as its regular name. 

-Furthermore, there exist versions to use in the case of derived classes:
+For all the macros, the first parameter is the name of the class/struct. The `DERIVED_TYPE` macros require a second parameter of a base class. All the remaining parameters name the member variables. The `WITH_NAMES` macros require a JSON name before each of the variables.

 | Need access to private members                                   | Need only de-serialization                                       | Allow missing values when de-serializing                         | macro                                                                                                        |
 |------------------------------------------------------------------|------------------------------------------------------------------|------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------|
@@ -118,8 +120,9 @@ For _derived_ classes and structs, use the following macros

 !!! info "Implementation limits"

-    - The current macro implementations are limited to at most 64 member variables. If you want to serialize/deserialize
-      types with more than 64 member variables, you need to define the `to_json`/`from_json` functions manually.
+    - The current macro implementations are limited to at most 63 member variables. If you want to serialize/deserialize
+      types with more than 63 member variables, you need to define the `to_json`/`from_json` functions manually.
+    - For the `WITH_NAMES` variants the limit is halved to 31 member variables.

 ??? example

@@ -131,8 +134,20 @@ For _derived_ classes and structs, use the following macros
    }
    ```

-    Here is an example with private members, where `NLOHMANN_DEFINE_TYPE_INTRUSIVE` is needed:
-
+    If you want to inherit the `person` struct and add a field to it, it can be done with:
+    
+    ```cpp
+    namespace ns {
+        struct person_derived : person {
+            std:string email;
+        };
+        
+        NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE(person_derived, person, email)
+    }
+    ```
+    
+    Here is another example with private members, where `NLOHMANN_DEFINE_TYPE_INTRUSIVE` is needed:
+    
    ```cpp
    namespace ns {
        class address {
@@ -140,12 +155,30 @@ For _derived_ classes and structs, use the following macros
            std::string street;
            int housenumber;
            int postcode;
-
+      
          public:
            NLOHMANN_DEFINE_TYPE_INTRUSIVE(address, street, housenumber, postcode)
        };
    }
    ```
+    
+    Or in case if you use some naming convention that you do not want to expose to JSON:
+    
+    ```cpp
+    namespace ns {
+        class address {
+          private:
+            std::string m_street;
+            int m_housenumber;
+            int m_postcode;
+    
+          public:
+            NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_NAMES(address, "street", m_street,
+                                                               "housenumber", m_housenumber,
+                                                               "postcode", m_postcode)
+        };
+    }
+    ```

 ## How do I convert third-party types?

@@ -191,7 +224,7 @@ struct adl_serializer<boost::optional<T>> {
        if (j.is_null()) {
            opt = boost::none;
        } else {
-            opt = j.template get<T>(); // same as above, but with
+            opt = j.get<T>(); // same as above, but with
                              // adl_serializer<T>::from_json
        }
    }
@@ -224,7 +257,7 @@ namespace nlohmann {
        // note: the return type is no longer 'void', and the method only takes
        // one argument
        static move_only_type from_json(const json& j) {
-            return {j.template get<int>()};
+            return {j.get<int>()};
        }

        // Here's the catch! You must provide a to_json method! Otherwise, you
@@ -288,7 +321,7 @@ struct bad_serializer
    static void from_json(const BasicJsonType& j, T& value) {
      // this calls BasicJsonType::json_serializer<T>::from_json(j, value);
      // if BasicJsonType::json_serializer == bad_serializer ... oops!
-      value = j.template template get<T>(); // oops!
+      value = j.template get<T>(); // oops!
    }
 };
 ```
@@ -115,7 +115,7 @@ The library uses the following mapping from JSON values types to BJData types ac
    }
    ```

-    Likewise, when a JSON object in the above form is serialzed using
+    Likewise, when a JSON object in the above form is serialized using
    [`to_bjdata`](../../api/basic_json/to_bjdata.md), it is automatically converted into a compact BJData ND-array. The
    only exception is, that when the 1-dimensional vector stored in `"_ArraySize_"` contains a single integer or two
    integers with one being 1, a regular 1-D optimized array is generated.
@@ -36,11 +36,11 @@ assert(j == "stopped");

 // json string to enum
 json j3 = "running";
-assert(j3.template get<TaskState>() == TS_RUNNING);
+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.template get<TaskState>() == TS_INVALID );
+assert(jPi.get<TaskState>() == TS_INVALID );
 ```

 ## Notes
@@ -54,8 +54,9 @@ Just as in [Arbitrary Type Conversions](arbitrary_types.md) above,

 Other Important points:

- When using `template get<ENUM_TYPE>()`, undefined JSON values will default to the first pair specified in your map. Select this
-  default pair carefully.
+- When using `get<ENUM_TYPE>()`, undefined JSON values will default to the first pair specified in your map. Select this
+  default pair carefully. If you desire an exception in this circumstance use [`NLOHMANN_JSON_SERIALIZE_ENUM_STRICT()`](../api/macros/nlohmann_json_serialize_enum_strict.md)
+  which behaves identically except for throwing an exception on unrecognized values.
 - 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.
 - To disable the default serialization of enumerators as integers and force a compiler error instead, see [`JSON_DISABLE_ENUM_SERIALIZATION`](../api/macros/json_disable_enum_serialization.md).
@@ -0,0 +1,40 @@
+# Modules
+
+This library has experimental support for C++ modules, introduced in C++20. The library can be imported by writing `import nlohmann.json;` instead of `#include <nlohmann/json.hpp>`. 
+
+Please be aware that the module is experimental and a full test is outstanding, and the exported symbols are subject to change.
+
+## Requirements
+The `nlohmann.json` module requires that the build system is configured to build and resolve modules when imported. Obviously, as modules were introduced in C++20, this feature can only be used in C++20 and subsequent versions.
+
+To enable building the `nlohmann.json` module (which is not done by default), the macro `NLOHMANN_JSON_BUILD_MODULES` must be passed to the build system.
+
+## Example
+When using modules rather than headers, the previous example for creating a `json` object through a JSON file, would instead be:
+```cpp
+import std;
+import nlohmann.json;
+
+using json = nlohmann::json;
+
+// ...
+
+std::ifstream f("example.json");
+json data = json::parse(f);
+```
+
+## Modules do not export macros
+It should be noted that as modules do not export macros, the `nlohmann.json` module will not export any macros.
+
+## Exported symbols
+Only the following symbols are exported from `nlohmann.json`:
+
+- `nlohmann::adl_serializer`
+- `nlohmann::basic_json`
+- `nlohmann::json`
+- `nlohmann::json_pointer`
+- `nlohmann::ordered_json`
+- `nlohmann::ordered_map`
+- `nlohmann::to_string`
+- `nlohmann::literals::json_literals::operator""_json`
+- `nlohmann::literals::json_literals::operator""_json_pointer`
@@ -10,7 +10,7 @@ types.
 The complete default namespace name is derived as follows:

 - The root namespace is always `nlohmann`.
- The inline namespace starts with `json_abi` and is followed by serveral optional ABI tags according to the value of
+- The inline namespace starts with `json_abi` and is followed by several optional ABI tags according to the value of
  these ABI-affecting macros, in order:
    - [`JSON_DIAGNOSTICS`](../api/macros/json_diagnostics.md) defined non-zero appends `_diag`.
    - [`JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON`](../api/macros/json_use_legacy_discarded_value_comparison.md)
@@ -235,14 +235,27 @@ integers, and between integers and floating-point values to integers. This behav
 !!! warning "Unconditional number conversions"

    ```cpp hl_lines="3"
-    double d = 42.3;                                   // non-integer double value 42.3
-    json jd = d;                                       // stores double value 42.3
-    std::int64_t i = jd.template get<std::int64_t>();  // now i==42; no warning or error is produced
+    double d = 42.3;                          // non-integer double value 42.3
+    json jd = d;                              // stores double value 42.3
+    std::int64_t i = jd.get<std::int64_t>();  // now i==42; no warning or error is produced
    ```

    Note the last line with throw a [`json.exception.type_error.302`](../../home/exceptions.md#jsonexceptiontype_error302)
    exception if `jd` is not a numerical type, for instance a string.

+    Numeric conversions are performed according to the corresponding C++ conversion rules. The library does not perform
+    range checks when converting between numeric types.
+    
+    In particular, conversions from floating-point values to integer types, or conversions to integer types with a
+    smaller range than the stored value, may produce implementation-defined or undefined behavior if the source value
+    cannot be represented by the target type.
+    
+    Applications requiring checked conversions should inspect the stored number type with
+    [`is_number_float()`](../../api/basic_json/is_number_float.md),
+    [`is_number_integer()`](../../api/basic_json/is_number_integer.md),
+    [`is_number_unsigned()`](../../api/basic_json/is_number_unsigned.md), or
+    [`type()`](../../api/basic_json/type.md), and perform explicit range checks before converting to a narrower type.
+
 The rationale is twofold:

 1. JSON does not define a number type or precision (see above).
@@ -259,7 +272,7 @@ The rationale is twofold:
    if (jd.is_number_integer())
    {
        // if so, do the conversion and use i
-        std::int64_t i = jd.template get<std::int64_t>();
+        std::int64_t i = jd.get<std::int64_t>();
        // ...
    }
    else
@@ -13,7 +13,7 @@ the result of an internet search. If you know further customers of the library,

 - [**Alexa Auto SDK**](https://github.com/alexa/alexa-auto-sdk), a software development kit enabling the integration of Alexa into automotive systems
 - [**Apollo**](https://github.com/ApolloAuto/apollo), a framework for building autonomous driving systems
- [**Automotive Grade Linux (AGL)**](https://download.automotivelinux.org/AGL/release/jellyfish/latest/qemux86-64/deploy/licenses/nlohmann-json/): a collaborative open-source platform for automotive software development
+- [**Automotive Grade Linux (AGL)**](https://download.automotivelinux.org/AGL/release/jellyfish/latest/qemux86-64/deploy/licenses/nlohmann-json/), a collaborative open-source platform for automotive software development
 - [**Genesis Motor** (infotainment)](http://webmanual.genesis.com/ccIC/AVNT/JW/KOR/English/reference010.html), a luxury automotive brand
 - [**Hyundai** (infotainment)](https://www.hyundai.com/wsvc/ww/download.file.do?id=/content/hyundai/ww/data/opensource/data/GN7-2022/licenseCode/info), a global automotive brand
 - [**Kia** (infotainment)](http://webmanual.kia.com/PREM_GEN6/AVNT/RJPE/KOR/Korean/reference010.html), a global automotive brand
@@ -23,30 +23,36 @@ the result of an internet search. If you know further customers of the library,

 ## Gaming and Entertainment

- [**Assassin's Creed: Mirage**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/): a stealth-action game set in the Middle East, focusing on the journey of a young assassin with classic parkour and stealth mechanics
- [**Chasm: The Rift**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/): a first-person shooter blending horror and adventure, where players navigate dark realms and battle monsters
- [**College Football 25**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/): a college football simulation game featuring gameplay that mimics real-life college teams and competitions
- [**Concepts**](https://concepts.app/en/licenses): a digital sketching app designed for creative professionals, offering flexible drawing tools for illustration, design, and brainstorming
- [**Depthkit**](https://www.depthkit.tv/third-party-licenses): a tool for creating and capturing volumetric video, enabling immersive 3D experiences and interactive content
- [**immersivetech**](https://immersitech.io/open-source-third-party-software/): a technology company focused on immersive experiences, providing tools and solutions for virtual and augmented reality applications
+- [**Assassin's Creed: Mirage**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a stealth-action game set in the Middle East, focusing on the journey of a young assassin with classic parkour and stealth mechanics
+- [**Chasm: The Rift**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a first-person shooter blending horror and adventure, where players navigate dark realms and battle monsters
+- [**College Football 25**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a college football simulation game featuring gameplay that mimics real-life college teams and competitions
+- [**Concepts**](https://concepts.app/en/licenses), a digital sketching app designed for creative professionals, offering flexible drawing tools for illustration, design, and brainstorming
+- [**Depthkit**](https://www.depthkit.tv/third-party-licenses), a tool for creating and capturing volumetric video, enabling immersive 3D experiences and interactive content
+- [**IMG.LY**](https://img.ly/acknowledgements), a platform offering creative tools and SDKs for integrating advanced image and video editing in applications
 - [**LOOT**](https://loot.readthedocs.io/_/downloads/en/0.13.0/pdf/), a tool for optimizing the load order of game plugins, commonly used in The Elder Scrolls and Fallout series
- [**Madden NFL 25**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/): a sports simulation game capturing the excitement of American football with realistic gameplay and team management features
+- [**Madden NFL 25**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a sports simulation game capturing the excitement of American football with realistic gameplay and team management features
 - [**Marne**](https://marne.io/licenses), an unofficial private server platform for hosting custom Battlefield 1 game experiences
 - [**Minecraft**](https://www.minecraft.net/zh-hant/attribution), a popular sandbox video game
- [**NHL 22**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/): a hockey simulation game offering realistic gameplay, team management, and various modes to enhance the hockey experience
- [**Pixelpart**](https://pixelpart.net/documentation/book/third-party.html): a 2D animation and video compositing software that allows users to create animated graphics and visual effects with a focus on simplicity and ease of use
- [**Red Dead Redemption II**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/): an open-world action-adventure game following an outlaw's story in the late 1800s, emphasizing deep storytelling and immersive gameplay
+- [**NHL 22**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a hockey simulation game offering realistic gameplay, team management, and various modes to enhance the hockey experience
+- [**Pixelpart**](https://pixelpart.net/documentation/book/third-party.html), a 2D animation and video compositing software that allows users to create animated graphics and visual effects with a focus on simplicity and ease of use
+- [**Razer Cortex**](https://mysupport.razer.com/app/answers/detail/a_id/14146/~/open-source-software-for-razer-software), a gaming performance optimizer and system booster designed to enhance the gaming experience
+- [**Red Dead Redemption II**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), an open-world action-adventure game following an outlaw's story in the late 1800s, emphasizing deep storytelling and immersive gameplay
+- [**Snapchat**](https://www.snap.com/terms/license-android), a multimedia messaging and augmented reality app for communication and entertainment
 - [**Tactics Ogre: Reborn**](https://www.square-enix-games.com/en_US/documents/tactics-ogre-reborn-pc-installer-software-and-associated-plug-ins-disclosure), a tactical role-playing game featuring strategic battles and deep storytelling elements
 - [**Throne and Liberty**](https://www.amazon.com/gp/help/customer/display.html?nodeId=T7fLNw5oAevCMtJFPj&pop-up=1), an MMORPG that offers an expansive fantasy world with dynamic gameplay and immersive storytelling
 - [**Unity Vivox**](https://docs.unity3d.com/Packages/com.unity.services.vivox@15.1/license/Third%20Party%20Notices.html), a communication service that enables voice and text chat functionality in multiplayer games developed with Unity
- [**Zool: Redimensioned**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/): a modern reimagining of the classic platformer featuring fast-paced gameplay and vibrant environments
+- [**Zool: Redimensioned**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a modern reimagining of the classic platformer featuring fast-paced gameplay and vibrant environments
+- [**immersivetech**](https://immersitech.io/open-source-third-party-software/), a technology company focused on immersive experiences, providing tools and solutions for virtual and augmented reality applications

 ## Consumer Electronics

- [**Audinate**](https://www.audinate.com/legal/software-licensing/dante-av-h-open-source-licenses/): a provider of networked audio solutions specializing in Dante technology, which facilitates high-quality digital audio transport over IP networks
+- [**Audinate**](https://www.audinate.com/legal/software-licensing/dante-av-h-open-source-licenses/), a provider of networked audio solutions specializing in Dante technology, which facilitates high-quality digital audio transport over IP networks
+- [**Canon CanoScan LIDE**](https://carolburo.com/wp-content/uploads/2024/06/LiDE400_OnlineManual_Win_FR_V02.pdf), a series of flatbed scanners offering high-resolution image scanning for home and office use
+- [**Canon PIXMA Printers**](https://www.mediaexpert.pl/products/files/73/7338196/Instrukcja-obslugi-CANON-Pixma-TS7450i.pdf), a line of all-in-one inkjet printers known for high-quality printing and wireless connectivity
 - [**Cisco Webex Desk Camera**](https://www.cisco.com/c/dam/en_us/about/doing_business/open_source/docs/CiscoWebexDeskCamera-23-1622100417.pdf), a video camera designed for professional-quality video conferencing and remote collaboration
- [**Philips Hue Personal Wireless Lighting**](http://2ak5ape.257.cz/): a smart lighting system for customizable and wireless home illumination
+- [**Philips Hue Personal Wireless Lighting**](http://2ak5ape.257.cz/), a smart lighting system for customizable and wireless home illumination
 - [**Ray-Ban Meta Smart glasses**](https://www.meta.com/de/en/legal/smart-glasses/third-party-notices-android/03/), a pair of smart glasses designed for capturing photos and videos with integrated connectivity and social features
+- [**Razer Synapse**](https://mysupport.razer.com/app/answers/detail/a_id/14146/~/open-source-software-for-razer-software), a unified configuration software enabling hardware customization for Razer devices
 - [**Siemens SINEMA Remote Connect**](https://cache.industry.siemens.com/dl/files/790/109793790/att_1054961/v2/OSS_SINEMA-RC_86.pdf), a remote connectivity solution for monitoring and managing industrial networks and devices securely
 - [**Sony PlayStation 4**](https://doc.dl.playstation.net/doc/ps4-oss/index.html), a gaming console developed by Sony that offers a wide range of games and multimedia entertainment features
 - [**Sony Virtual Webcam Driver for Remote Camera**](https://helpguide.sony.net/rc/vwd/v1/zh-cn/print.pdf), a software driver that enables the use of Sony cameras as virtual webcams for video conferencing and streaming
@@ -56,7 +62,7 @@ the result of an internet search. If you know further customers of the library,
 - [**Apple iOS and macOS**](https://www.apple.com/macos), a family of operating systems developed by Apple, including iOS for mobile devices and macOS for desktop computers
 - [**Google Fuchsia**](https://fuchsia.googlesource.com/third_party/json/), an open-source operating system developed by Google, designed to be secure, updatable, and adaptable across various devices
 - [**SerenityOS**](https://github.com/SerenityOS/serenity), an open-source operating system that aims to provide a simple and beautiful user experience with a focus on simplicity and elegance
- [**Yocto**](http://ftp.emacinc.com/openembedded-sw/kirkstone-icop-5.15-kirkstone-6.0/archive-2024-10/pn8m-090t-ppc/licenses/nlohmann-json/): a Linux-based build system for creating custom operating systems and software distributions, tailored for embedded devices and IoT applications
+- [**Yocto**](http://ftp.emacinc.com/openembedded-sw/kirkstone-icop-5.15-kirkstone-6.0/archive-2024-10/pn8m-090t-ppc/licenses/nlohmann-json/), a Linux-based build system for creating custom operating systems and software distributions, tailored for embedded devices and IoT applications

 ## Development Tools and IDEs

@@ -66,67 +72,72 @@ the result of an internet search. If you know further customers of the library,
 - [**CoderPad**](https://coderpad.io), a collaborative coding platform that enables real-time code interviews and assessments for developers; the library is included in every CoderPad instance and can be accessed with a simple `#include "json.hpp"`
 - [**Compiler Explorer**](https://godbolt.org), a web-based tool that allows users to write, compile, and visualize the assembly output of code in various programming languages; the library is readily available and accessible with the directive `#include <nlohmann/json.hpp>`.
 - [**GitHub CodeQL**](https://github.com/github/codeql), a code analysis tool used for identifying security vulnerabilities and bugs in software through semantic queries
- [**Hex-Rays**](https://docs.hex-rays.com/user-guide/user-interface/licenses): a reverse engineering toolset for analyzing and decompiling binaries, primarily used for security research and vulnerability analysis
+- [**Hex-Rays**](https://docs.hex-rays.com/user-guide/user-interface/licenses), a reverse engineering toolset for analyzing and decompiling binaries, primarily used for security research and vulnerability analysis
 - [**ImHex**](https://github.com/WerWolv/ImHex), a hex editor designed for reverse engineering, providing advanced features for data analysis and manipulation
 - [**Intel GPA Framework**](https://intel.github.io/gpasdk-doc/src/licenses.html), a suite of cross-platform tools for capturing, analyzing, and optimizing graphics applications across different APIs
- [**Meta Yoga**](https://github.com/facebook/yoga), a layout engine that facilitates flexible and efficient user interface design across multiple platforms
+- [**Intopix**](https://www.intopix.com/software-licensing), a provider of advanced image processing and compression solutions used in software development and AV workflows
 - [**MKVToolNix**](https://mkvtoolnix.download/doc/README.md), a set of tools for creating, editing, and inspecting MKV (Matroska) multimedia container files
+- [**Meta Yoga**](https://github.com/facebook/yoga), a layout engine that facilitates flexible and efficient user interface design across multiple platforms
 - [**NVIDIA Nsight Compute**](https://docs.nvidia.com/nsight-compute/2022.2/pdf/CopyrightAndLicenses.pdf), a performance analysis tool for CUDA applications that provides detailed insights into GPU performance metrics
 - [**Notepad++**](https://github.com/notepad-plus-plus/notepad-plus-plus), a free source code editor that supports various programming languages
 - [**OpenRGB**](https://gitlab.com/CalcProgrammer1/OpenRGB), an open source RGB lighting control that doesn't depend on manufacturer software
- [**OpenTelemetry C++**](https://github.com/open-telemetry/opentelemetry-cpp): a library for collecting and exporting observability data in C++, enabling developers to implement distributed tracing and metrics in their application
+- [**OpenTelemetry C++**](https://github.com/open-telemetry/opentelemetry-cpp), a library for collecting and exporting observability data in C++, enabling developers to implement distributed tracing and metrics in their application
 - [**Qt Creator**](https://doc.qt.io/qtcreator/qtcreator-attribution-json-nlohmann.html), an IDE for developing applications using the Qt application framework
- [**Scanbot SDK**](https://docs.scanbot.io/barcode-scanner-sdk/web/third-party-libraries/): a software development kit (SDK) that provides tools for integrating advanced document scanning and barcode scanning capabilities into applications
+- [**Scanbot SDK**](https://docs.scanbot.io/barcode-scanner-sdk/web/third-party-libraries/), a software development kit (SDK) that provides tools for integrating advanced document scanning and barcode scanning capabilities into applications

 ## Machine Learning and AI

 - [**Apple Core ML Tools**](https://github.com/apple/coremltools), a set of tools for converting and configuring machine learning models for deployment in Apple's Core ML framework
- [**Avular Mobile Robotics**](https://www.avular.com/licenses/nlohmann-json-3.9.1.txt): a platform for developing and deploying mobile robotics solutions
+- [**Avular Mobile Robotics**](https://www.avular.com/licenses/nlohmann-json-3.9.1.txt), a platform for developing and deploying mobile robotics solutions
 - [**Google gemma.cpp**](https://github.com/google/gemma.cpp), a lightweight C++ inference engine designed for running AI models from the Gemma family
 - [**llama.cpp**](https://github.com/ggerganov/llama.cpp), a C++ library designed for efficient inference of large language models (LLMs), enabling streamlined integration into applications
 - [**MLX**](https://github.com/ml-explore/mlx), an array framework for machine learning on Apple Silicon
 - [**Mozilla llamafile**](https://github.com/Mozilla-Ocho/llamafile), a tool designed for distributing and executing large language models (LLMs) efficiently using a single file format
 - [**NVIDIA ACE**](https://docs.nvidia.com/ace/latest/index.html), a suite of real-time AI solutions designed for the development of interactive avatars and digital human applications, enabling scalable and sophisticated user interactions
- [**Peer**](https://support.peer.inc/hc/en-us/articles/17261335054235-Licenses): a platform offering personalized AI assistants for interactive learning and creative collaboration
- [**stable-diffusion.cpp**](https://github.com/leejet/stable-diffusion.cpp): a C++ implementation of the Stable Diffusion image generation model
- [**TanvasTouch**](https://tanvas.co/tanvastouch-sdk-third-party-acknowledgments): a software development kit (SDK) that enables developers to create tactile experiences on touchscreens, allowing users to feel textures and physical sensations in a digital environment
+- [**Peer**](https://support.peer.inc/hc/en-us/articles/17261335054235-Licenses), a platform offering personalized AI assistants for interactive learning and creative collaboration
+- [**stable-diffusion.cpp**](https://github.com/leejet/stable-diffusion.cpp), a C++ implementation of the Stable Diffusion image generation model
+- [**TanvasTouch**](https://tanvas.co/tanvastouch-sdk-third-party-acknowledgments), a software development kit (SDK) that enables developers to create tactile experiences on touchscreens, allowing users to feel textures and physical sensations in a digital environment
 - [**TensorFlow**](https://github.com/tensorflow/tensorflow), a machine learning framework that facilitates the development and training of models, supporting data serialization and efficient data exchange between components

 ## Scientific Research and Analysis

 - [**BLACK**](https://www.black-sat.org/en/stable/installation/linux.html), a bounded linear temporal logic (LTL) satisfiability checker
 - [**CERN Atlas Athena**](https://gitlab.cern.ch/atlas/athena/-/blob/main/Control/PerformanceMonitoring/PerfMonComps/src/PerfMonMTSvc.h), a software framework used in the ATLAS experiment at the Large Hadron Collider (LHC) for performance monitoring
- [**KAMERA**](https://github.com/Kitware/kamera): a platform for synchronized data collection and real-time deep learning to map marine species like polar bears and seals, aiding Arctic ecosystem research
- [**KiCad**](https://gitlab.com/kicad/code/kicad/-/tree/master/thirdparty/nlohmann_json): a free and open-source software suite for electronic design automation
- [**MeVisLab**](https://mevislabdownloads.mevis.de/docs/current/MeVis/ThirdParty/Documentation/Publish/ThirdPartyReference/index.html): a software framework for medical image processing and visualization.
- [**OpenPMD API**](https://openpmd-api.readthedocs.io/en/0.8.0-alpha/backends/json.html): a versatile programming interface for accessing and managing scientific data, designed to facilitate the efficient storage, retrieval, and sharing of simulation data across various applications and platforms
- [**ParaView**](https://github.com/Kitware/ParaView): an open-source tool for large-scale data visualization and analysis across various scientific domains
- [**QGIS**](https://gitlab.b-data.ch/qgis/qgis/-/blob/backport-57658-to-release-3_34/external/nlohmann/json.hpp): a free and open-source geographic information system (GIS) application that allows users to create, edit, visualize, and analyze geospatial data across a variety of formats
- [**VTK**](https://github.com/Kitware/VTK): a software library for 3D computer graphics, image processing, and visualization
- [**VolView**](https://github.com/Kitware/VolView): a lightweight application for interactive visualization and analysis of 3D medical imaging data.
+- [**ICU**](https://github.com/unicode-org/icu), the International Components for Unicode, a mature library for software globalization and multilingual support
+- [**KAMERA**](https://github.com/Kitware/kamera), a platform for synchronized data collection and real-time deep learning to map marine species like polar bears and seals, aiding Arctic ecosystem research
+- [**KiCad**](https://gitlab.com/kicad/code/kicad/-/tree/master/thirdparty/nlohmann_json), a free and open-source software suite for electronic design automation
+- [**Maple**](https://www.maplesoft.com/support/help/Maple/view.aspx?path=copyright), a symbolic and numeric computing environment for advanced mathematical modeling and analysis
+- [**MeVisLab**](https://mevislabdownloads.mevis.de/docs/current/MeVis/ThirdParty/Documentation/Publish/ThirdPartyReference/index.html), a software framework for medical image processing and visualization.
+- [**OpenPMD API**](https://openpmd-api.readthedocs.io/en/0.8.0-alpha/backends/json.html), a versatile programming interface for accessing and managing scientific data, designed to facilitate the efficient storage, retrieval, and sharing of simulation data across various applications and platforms
+- [**ParaView**](https://github.com/Kitware/ParaView), an open-source tool for large-scale data visualization and analysis across various scientific domains
+- [**QGIS**](https://gitlab.b-data.ch/qgis/qgis/-/blob/backport-57658-to-release-3_34/external/nlohmann/json.hpp), a free and open-source geographic information system (GIS) application that allows users to create, edit, visualize, and analyze geospatial data across a variety of formats
+- [**VTK**](https://github.com/Kitware/VTK), a software library for 3D computer graphics, image processing, and visualization
+- [**VolView**](https://github.com/Kitware/VolView), a lightweight application for interactive visualization and analysis of 3D medical imaging data.

 ## Business and Productivity Software

 - [**ArcGIS PRO**](https://www.esri.com/content/dam/esrisites/en-us/media/legal/open-source-acknowledgements/arcgis-pro-2-8-attribution-report.html), a desktop geographic information system (GIS) application developed by Esri for mapping and spatial analysis
 - [**Autodesk Desktop**](https://damassets.autodesk.net/content/dam/autodesk/www/Company/legal-notices-trademarks/autodesk-desktop-platform-components/internal-autodesk-components-web-page-2023.pdf), a software platform developed by Autodesk for creating and managing desktop applications and services
- [**Check Point**](https://www.checkpoint.com/about-us/copyright-and-trademarks/): a cybersecurity company specializing in threat prevention and network security solutions, offering a range of products designed to protect enterprises from cyber threats and ensure data integrity
+- [**Check Point**](https://www.checkpoint.com/about-us/copyright-and-trademarks/), a cybersecurity company specializing in threat prevention and network security solutions, offering a range of products designed to protect enterprises from cyber threats and ensure data integrity
 - [**Microsoft Office for Mac**](https://officecdnmac.microsoft.com/pr/legal/mac/OfficeforMacAttributions.html), a suite of productivity applications developed by Microsoft for macOS, including tools for word processing, spreadsheets, and presentations
 - [**Microsoft Teams**](https://www.microsoft.com/microsoft-teams/), a team collaboration application offering workspace chat and video conferencing, file storage, and integration of proprietary and third-party applications and services
- [**Nexthink Infinity**](https://docs.nexthink.com/legal/services-terms/experience-open-source-software-licenses/infinity-2022.8-software-licenses): a digital employee experience management platform for monitoring and improving IT performance
- [**Sophos Connect Client**](https://docs.sophos.com/nsg/licenses/SophosConnect/SophosConnectAttribution.html): a secure VPN client from Sophos that allows remote users to connect to their corporate network, ensuring secure access to resources and data
- [**Stonebranch**](https://stonebranchdocs.atlassian.net/wiki/spaces/UA77/pages/799545647/Licenses+for+Third-Party+Libraries): a cloud-based cybersecurity solution that integrates backup, disaster recovery, and cybersecurity features to protect data and ensure business continuity for organizations
- [**Tablecruncher**](https://tablecruncher.com/): a data analysis tool that allows users to import, analyze, and visualize spreadsheet data, offering interactive features for better insights and decision-making
+- [**Nexthink Infinity**](https://docs.nexthink.com/legal/services-terms/experience-open-source-software-licenses/infinity-2022.8-software-licenses), a digital employee experience management platform for monitoring and improving IT performance
+- [**Sophos Connect Client**](https://docs.sophos.com/nsg/licenses/SophosConnect/SophosConnectAttribution.html), a secure VPN client from Sophos that allows remote users to connect to their corporate network, ensuring secure access to resources and data
+- [**Stonebranch**](https://stonebranchdocs.atlassian.net/wiki/spaces/UA77/pages/799545647/Licenses+for+Third-Party+Libraries), a cloud-based cybersecurity solution that integrates backup, disaster recovery, and cybersecurity features to protect data and ensure business continuity for organizations
+- [**Tablecruncher**](https://tablecruncher.com/), a data analysis tool that allows users to import, analyze, and visualize spreadsheet data, offering interactive features for better insights and decision-making
 - [**magicplan**](https://help.magicplan.app/acknowledgments), a mobile application for creating floor plans and interior designs using augmented reality

 ## Databases and Big Data

- [**ADIOS2**](https://code.ornl.gov/ecpcitest/adios2/-/tree/pr4285_FFSUpstream/thirdparty/nlohmann_json?ref_type=heads): a data management framework designed for high-performance input and output operations
- [**Cribl Stream**](https://docs.cribl.io/stream/third-party-current-list/): a real-time data processing platform that enables organizations to collect, route, and transform observability data, enhancing visibility and insights into their systems
+- [**ADIOS2**](https://code.ornl.gov/ecpcitest/adios2/-/tree/pr4285_FFSUpstream/thirdparty/nlohmann_json?ref_type=heads), a data management framework designed for high-performance input and output operations
+- [**Cribl Stream**](https://docs.cribl.io/stream/third-party-current-list/), a real-time data processing platform that enables organizations to collect, route, and transform observability data, enhancing visibility and insights into their systems
 - [**DB Browser for SQLite**](https://github.com/sqlitebrowser/sqlitebrowser), a visual open-source tool for creating, designing, and editing SQLite database files
 - [**MySQL Connector/C++**](https://docs.oracle.com/cd/E17952_01/connector-cpp-9.1-license-com-en/license-opentelemetry-cpp-com.html), a C++ library for connecting and interacting with MySQL databases
 - [**MySQL NDB Cluster**](https://downloads.mysql.com/docs/licenses/cluster-9.0-com-en.pdf), a distributed database system that provides high availability and scalability for MySQL databases
+- [**MySQL Shell**](https://downloads.mysql.com/docs/licenses/mysql-shell-8.0-gpl-en.pdf), an advanced client and code editor for interacting with MySQL servers, supporting SQL, Python, and JavaScript
 - [**PrestoDB**](https://github.com/prestodb/presto), a distributed SQL query engine designed for large-scale data analytics, originally developed by Facebook
 - [**ROOT Data Analysis Framework**](https://root.cern/doc/v614/classnlohmann_1_1basic__json.html), an open-source data analysis framework widely used in high-energy physics and other fields for data processing and visualization
+- [**WiredTiger**](https://github.com/wiredtiger/wiredtiger), a high-performance storage engine for databases, offering support for compression, concurrency, and checkpointing

 ## Simulation and Modeling

@@ -134,30 +145,33 @@ the result of an internet search. If you know further customers of the library,
 - [**azul**](https://pure.tudelft.nl/ws/files/85338589/tgis.12673.pdf), a fast and efficient 3D city model viewer designed for visualizing urban environments and spatial data
 - [**Blender**](https://projects.blender.org/blender/blender/search?q=nlohmann), a free and open-source 3D creation suite for modeling, animation, rendering, and more
 - [**cpplot**](https://cpplot.readthedocs.io/en/latest/library_api/function_eigen_8h_1ac080eac0541014c5892a55e41bf785e6.html), a library for creating interactive graphs and charts in C++, which can be viewed in web browsers
+- [**Foundry Nuke**](https://learn.foundry.com/nuke/content/misc/studio_third_party_libraries.html), a powerful node-based digital compositing and visual effects application used in film and television post-production
+- [**GAMS**](https://www.gams.com/47/docs/THIRDPARTY.html), a high-performance mathematical modeling system for optimization and decision support
+- [**Kitware SMTK**](https://github.com/Kitware/SMTK), a software toolkit for managing simulation models and workflows in scientific and engineering applications
+- [**M-Star**](https://docs.mstarcfd.com/3_Licensing/thirdparty-licenses.html), a computational fluid dynamics software for simulating and analyzing fluid flow
+- [**MapleSim CAD Toolbox**](https://www.maplesoft.com/support/help/MapleSim/view.aspx?path=CADToolbox/copyright), a software extension for MapleSim that integrates CAD models, allowing users to import, manipulate, and analyze 3D CAD data within the MapleSim environment for enhanced modeling and simulation
 - [**NVIDIA Omniverse**](https://docs.omniverse.nvidia.com/composer/latest/common/product-licenses/usd-explorer/usd-explorer-2023.2.0-licenses-manifest.html), a platform for 3D content creation and collaboration that enables real-time simulations and interactive experiences across various industries
 - [**Pixar Renderman**](https://rmanwiki-26.pixar.com/space/REN26/19662083/Legal+Notice), a photorealistic 3D rendering software developed by Pixar, widely used in the film industry for creating high-quality visual effects and animations
 - [**ROS - Robot Operating System**](http://docs.ros.org/en/noetic/api/behaviortree_cpp/html/json_8hpp_source.html), a set of software libraries and tools that assist in developing robot applications
 - [**UBS**](https://www.ubs.com/), a multinational financial services and banking company
- [**GAMS**](https://www.gams.com/47/docs/THIRDPARTY.html): a high-performance mathematical modeling system for optimization and decision support
- [**M-Star**](https://docs.mstarcfd.com/3_Licensing/thirdparty-licenses.html): a computational fluid dynamics software for simulating and analyzing fluid flow
- [**MapleSim CAD Toolbox**](https://www.maplesoft.com/support/help/MapleSim/view.aspx?path=CADToolbox/copyright): a software extension for MapleSim that integrates CAD models, allowing users to import, manipulate, and analyze 3D CAD data within the MapleSim environment for enhanced modeling and simulation
- [**Kitware SMTK**](https://github.com/Kitware/SMTK): a software toolkit for managing simulation models and workflows in scientific and engineering applications

 ## Enterprise and Cloud Applications

- [**Acronis Cyber Protect Cloud**](https://care.acronis.com/s/article/59533-Third-party-software-used-in-Acronis-Cyber-Protect-Cloud?language=en_US): an all-in-one data protection solution that combines backup, disaster recovery, and cybersecurity to safeguard business data from threats like ransomware
- [**Baereos**](https://gitlab.tiger-computing.co.uk/packages/bareos/-/blob/tiger/bullseye/third-party/CLI11/examples/json.cpp): a backup solution that provides data protection and recovery options for various environments, including physical and virtual systems
+- [**Acronis Cyber Protect Cloud**](https://care.acronis.com/s/article/59533-Third-party-software-used-in-Acronis-Cyber-Protect-Cloud?language=en_US), an all-in-one data protection solution that combines backup, disaster recovery, and cybersecurity to safeguard business data from threats like ransomware
+- [**Baereos**](https://gitlab.tiger-computing.co.uk/packages/bareos/-/blob/tiger/bullseye/third-party/CLI11/examples/json.cpp), a backup solution that provides data protection and recovery options for various environments, including physical and virtual systems
 - [**Bitdefender Home Scanner**](https://www.bitdefender.de/site/Main/view/home-scanner-open-source.html), a tool from Bitdefender that scans devices for malware and security threats, providing a safeguard against potential online dangers
- [**Citrix Provisioning**](https://docs.citrix.com/en-us/provisioning/2203-ltsr/downloads/pvs-third-party-notices-2203.pdf): a solution that streamlines the delivery of virtual desktops and applications by allowing administrators to manage and provision resources efficiently across multiple environments
+- [**Citrix Provisioning**](https://docs.citrix.com/en-us/provisioning/2203-ltsr/downloads/pvs-third-party-notices-2203.pdf), a solution that streamlines the delivery of virtual desktops and applications by allowing administrators to manage and provision resources efficiently across multiple environments
 - [**Citrix Virtual Apps and Desktops**](https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/2305/downloads/third-party-notices-apps-and-desktops.pdf), a solution from Citrix that delivers virtual apps and desktops
- [**Cyberarc**](https://docs.cyberark.com/Downloads/Legal/Privileged%20Session%20Manager%20for%20SSH%20Third-Party%20Notices.pdf): a security solution that specializes in privileged access management, enabling organizations to control and monitor access to critical systems and data, thereby enhancing overall cybersecurity posture
- [**Elster**](https://www.secunet.com/en/about-us/press/article/elstersecure-bietet-komfortablen-login-ohne-passwort-dank-secunet-protect4use): a digital platform developed by German tax authorities for secure and efficient electronic tax filing and management using secunet protect4use
- [**Egnyte Desktop**](https://helpdesk.egnyte.com/hc/en-us/articles/360007071732-Third-Party-Software-Acknowledgements): a secure cloud storage solution designed for businesses, enabling file sharing, collaboration, and data management across teams while ensuring compliance and data protection
+- [**Cyberarc**](https://docs.cyberark.com/Downloads/Legal/Privileged%20Session%20Manager%20for%20SSH%20Third-Party%20Notices.pdf), a security solution that specializes in privileged access management, enabling organizations to control and monitor access to critical systems and data, thereby enhancing overall cybersecurity posture
+- [**Egnyte Desktop**](https://helpdesk.egnyte.com/hc/en-us/articles/360007071732-Third-Party-Software-Acknowledgements), a secure cloud storage solution designed for businesses, enabling file sharing, collaboration, and data management across teams while ensuring compliance and data protection
+- [**Elster**](https://www.secunet.com/en/about-us/press/article/elstersecure-bietet-komfortablen-login-ohne-passwort-dank-secunet-protect4use), a digital platform developed by German tax authorities for secure and efficient electronic tax filing and management using secunet protect4use
 - [**Ethereum Solidity**](https://github.com/ethereum/solidity), a high-level, object-oriented programming language designed for implementing smart contracts on the Ethereum platform
- [**Inciga**](https://fossies.org/linux/icinga2/third-party/nlohmann_json/json.hpp): a monitoring tool for IT infrastructure, designed to provide insights into system performance and availability through customizable dashboards and alerts
- [**Intel Accelerator Management Daemon for VMware ESXi**](https://downloadmirror.intel.com/772507/THIRD-PARTY.txt): a management tool designed for monitoring and controlling Intel hardware accelerators within VMware ESXi environments, optimizing performance and resource allocation
+- [**Inciga**](https://fossies.org/linux/icinga2/third-party/nlohmann_json/json.hpp), a monitoring tool for IT infrastructure, designed to provide insights into system performance and availability through customizable dashboards and alerts
+- [**Intel Accelerator Management Daemon for VMware ESXi**](https://downloadmirror.intel.com/772507/THIRD-PARTY.txt), a management tool designed for monitoring and controlling Intel hardware accelerators within VMware ESXi environments, optimizing performance and resource allocation
 - [**Juniper Identity Management Service**](https://www.juniper.net/documentation/us/en/software/jims/jims-guide/jims-guide.pdf)
 - [**Microsoft Azure IoT SDK**](https://library.e.abb.com/public/2779c5f85f30484192eb3cb3f666a201/IP%20Gateway%20Open%20License%20Declaration_9AKK108467A4095_Rev_C.pdf), a collection of tools and libraries to help developers connect, build, and deploy Internet of Things (IoT) solutions on the Azure cloud platform
 - [**Microsoft WinGet**](https://github.com/microsoft/winget-cli), a command-line utility included in the Windows Package Manager
- [**Pointr**](https://docs-dev.pointr.tech/docs/8.x/Developer%20Portal/Open%20Source%20Licenses/): a platform for indoor positioning and navigation solutions, offering tools and SDKs for developers to create location-based applications
- [**secunet protect4use**](https://www.secunet.com/en/about-us/press/article/elstersecure-bietet-komfortablen-login-ohne-passwort-dank-secunet-protect4use): a secure, passwordless multifactor authentication solution that transforms smartphones into digital keyrings, ensuring high security for online services and digital identities
+- [**plexusAV**](https://www.sisme.com/media/10994/manual_plexusav-p-avn-4-form8244-c.pdf), a high-performance AV-over-IP transceiver device capable of video encoding and decoding using the IPMX standard
+- [**Pointr**](https://docs-dev.pointr.tech/docs/8.x/Developer%20Portal/Open%20Source%20Licenses/), a platform for indoor positioning and navigation solutions, offering tools and SDKs for developers to create location-based applications
+- [**secunet protect4use**](https://www.secunet.com/en/about-us/press/article/elstersecure-bietet-komfortablen-login-ohne-passwort-dank-secunet-protect4use), a secure, passwordless multifactor authentication solution that transforms smartphones into digital keyrings, ensuring high security for online services and digital identities
+- [**Sencore MRD 7000**](https://www.foccusdigital.com/wp-content/uploads/2025/03/MRD-7000-Manual-8175V.pdf), a professional multi-channel receiver and decoder supporting UHD and HD stream decoding
@@ -868,6 +868,16 @@ Key identifiers to be serialized to BSON cannot contain code point U+0000, since
    BSON key cannot contain code point U+0000 (at byte 2)
    ```

+### json.exception.out_of_range.410
+
+Undefined json fields cannot be used with [`NLOHMANN_JSON_SERIALIZE_ENUM_STRICT`](../api/macros/nlohmann_json_serialize_enum_strict.md)
+
+!!! failure "Example message"
+
+    ```
+    enum value out of range
+    ```
+
 ## Further exceptions

 This exception is thrown in case of errors that cannot be classified with the
@@ -38,6 +38,26 @@ for objects.

    To avoid any confusion and ensure portable code, **do not** use brace initialization with the types `basic_json`, `json`, or `ordered_json` unless you want to create an object or array as shown in the examples above.

+    To explicitly create a single-element array, use `json::array({value})`:
+
+    ```cpp
+    json j = json::array({true});  // [true]
+    ```
+
+**Opt-in copy semantics (since version 3.12.0)**
+
+If you define `JSON_BRACE_INIT_COPY_SEMANTICS` to `1` before including the library, single-element brace initialization is treated as copy/move instead of creating a single-element array:
+
+```cpp
+#define JSON_BRACE_INIT_COPY_SEMANTICS 1
+#include <nlohmann/json.hpp>
+
+json obj = {{"key", "value"}};
+json j{obj};   // -> {"key":"value"}  (copy, not array)
+```
+
+Without the macro (default behavior), `json j{obj}` creates `[{"key":"value"}]`. This opt-in macro fixes issue #5074 while preserving backwards compatibility for existing code.
+
 ## Limitations

 ### Relaxed parsing
@@ -4,7 +4,7 @@

 The class is licensed under the [MIT License](https://opensource.org/licenses/MIT):

-Copyright &copy; 2013-2025 [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:

@@ -251,7 +251,7 @@ http://nlohmann.github.io/json/doxygen/classnlohmann_1_1basic__json_a0a45fc74063
 - Fixed typos and broken links in README. #1417 #1423 #1425 #1451 #1455 #1491
 - Fixed documentation of parse function. #1473
 - Suppressed warning that cannot be fixed inside the library. #1401 #1468
- Imroved package manager suppert:
+- Improved package manager suppert:
    - Updated Buckaroo instructions. #1495
    - Improved Meson support. #1463
    - Added Conda package manager documentation. #1430
@@ -685,7 +685,7 @@ After almost a year, here is finally a new release of JSON for Modern C++, and i

 This section describes changes that change the public API of the library and may require changes in code using a previous version of the library. In section "Moving from 2.x.x to 3.0.0" at the end of the release notes, we describe in detail how existing code needs to be changed.

- The library now uses [**user-defined exceptions**](http://nlohmann.github.io/json/doxygen/classnlohmann_1_1basic__json_a9a0aced019cb1d65bb49703406c84970.html#a9a0aced019cb1d65bb49703406c84970) instead of re-using those defined in `<stdexcept>` (#244). This not only allows to add more information to the exceptions (every exception now has an identifier, and parse errors contain the position of the error), but also to easily catch all library exceptions with a single `catch(json::exception)`.
+- The library now uses [**user-defined exceptions**](http://nlohmann.github.io/json/doxygen/classnlohmann_1_1basic__json_a9a0aced019cb1d65bb49703406c84970.html#a9a0aced019cb1d65bb49703406c84970) instead of reusing those defined in `<stdexcept>` (#244). This not only allows to add more information to the exceptions (every exception now has an identifier, and parse errors contain the position of the error), but also to easily catch all library exceptions with a single `catch(json::exception)`.
 - When strings with a different encoding as UTF-8 were stored in JSON values, their serialization could not be parsed by the library itself, as only UTF-8 is supported. To enforce this library limitation and improve consistency, **non-UTF-8 encoded strings now yield a `json::type_error` exception during serialization** (#838). The check for valid UTF-8 is realized with code from [Björn Hoehrmann](http://bjoern.hoehrmann.de/).
 - **NaN and infinity values can now be stored inside the JSON value** without throwing an exception. They are, however, still serialized as `null` (#388).
 - The library's iterator tag was changed from RandomAccessIterator to **[BidirectionalIterator](https://en.cppreference.com/w/cpp/named_req/BidirectionalIterator)** (#593). Supporting RandomAccessIterator was incorrect as it assumed an ordering of values in a JSON objects which are unordered by definition.
@@ -1185,7 +1185,7 @@ As `noexcept` and `constexpr` specifier have been added to several functions, th
 This release fixes several small bugs and adds functionality in a backwards-compatible manner. Compared to the [last version (1.0.0)](https://github.com/nlohmann/json/releases/tag/v1.0.0), the following changes have been made:

 ### Changes
- _Fixed_: **Floating-point numbers** are now serialized and deserialized properly such that rountripping works in more cases. [#185, #186, #190, #191, #194]
+- _Fixed_: **Floating-point numbers** are now serialized and deserialized properly such that roundtripping works in more cases. [#185, #186, #190, #191, #194]
 - _Added_: The code now contains **assertions** to detect undefined behavior during development. As the standard function `assert` is used, the assertions can be switched off by defining the preprocessor symbol `NDEBUG` during compilation. [#168]
 - _Added_: It is now possible to get a **reference** to the stored values via the newly added function `get_ref()`. [#128, #184]
 - _Fixed_: Access to object values via keys (**`operator[]`**) now works with all kind of string representations. [#171, #189]
@@ -0,0 +1,6 @@
+libs =
+import libs = nlohmann-json%lib{json}
+
+exe{example}: {hxx ixx txx cxx}{**} $libs testscript
+
+cxx.poptions =+ "-I$out_root" "-I$src_root"
@@ -0,0 +1,10 @@
+#include <nlohmann/json.hpp>
+#include <iostream>
+#include <iomanip>
+
+using json = nlohmann::json;
+
+int main()
+{
+    std::cout << std::setw(4) << json::meta() << std::endl;
+}
--- a/Show More
+++ b/Show More