Docs: clarify there is no official npm package (impersonation/typosquat awareness) (#5299)

.github/SECURITY.md

@@ -15,6 +15,14 @@ guidance.
 
 For vulnerabilities in third-party dependencies or modules, please report them directly to the respective maintainers.
 
+## Unofficial packages
+
+This project does not publish an official npm package. The npm package
+[`nlohmann-json`](https://www.npmjs.com/package/nlohmann-json) (or similarly named packages) is not maintained or
+endorsed by this project. See the
+[package managers documentation](https://json.nlohmann.me/integration/package_managers/#npm) for supported
+integration options.
+
 ## Additional Resources
 
 - Explore security-related topics and contribute to tools and projects through

docs/mkdocs/docs/integration/package_managers.md

@@ -930,6 +930,12 @@ If you are using [CocoaPods](https://cocoapods.org), you can use the library by
 to your podfile (see [an example](https://bitbucket.org/benman/nlohmann_json-cocoapod/src/master/)). Please file issues
 [here](https://bitbucket.org/benman/nlohmann_json-cocoapod/issues?status=new&status=open).
 
+## npm
+
+This project does not publish an official [npm](https://www.npmjs.com) package. The npm package
+[`nlohmann-json`](https://www.npmjs.com/package/nlohmann-json) (or similarly named packages) is not maintained or
+endorsed by this project. Use one of the package managers listed above, or integrate the single header directly.
+
 ## ESP-IDF and PlatformIO
 
 There is no official package published to the [ESP-IDF Component Registry](https://components.espressif.com) or the