Creating a haxelib package

Each haxelib package is essentially a zip folder containing source code, supporting files, and a haxelib.json file.


Each Haxe library requires a haxelib.json file in which the following attributes are defined:

  • name: The name of the library. It must contain at least 3 characters among the following: [A-Za-z0-9_-.]. In particular, no spaces are allowed.
  • url: The URL of the library, i.e. where more information can be found.
  • license: The license under which the library is released. Can be GPL, LGPL, BSD, Public (for Public Domain), MIT, or Apache.
  • tags: An array of tag-strings which are used on the repository website to sort libraries.
  • description: The description of what the library is doing.
  • version: The version string of the library. This is detailed in Versioning.
  • classPath: The path string to the source files.
  • releasenote: The release notes of the current version.
  • contributors: An array of user names which identify contributors to the library that are allowed to upload to haxelib.
  • dependencies: An object describing the dependencies of the library. This is detailed in Dependencies.

The following JSON is a simple example of a haxelib.json:

  "name": "useless_lib",
  "url" : "",
  "license": "MIT",
  "tags": ["cross", "useless"],
  "description": "This library is useless in the same way on every platform.",
  "version": "1.0.0",
  "classPath": "src/",
  "releasenote": "Initial release, everything is working correctly.",
  "contributors": ["Juraj","Jason","Nicolas"],
  "dependencies": {
    "tink_macro": "",
    "nme": "3.5.5"


Haxelib uses a simplified version of SemVer. The basic format is this:


These are the basic rules:

  • Major versions are incremented when you break backwards compatibility - so old code will not work with the new version of the library.
  • Minor versions are incremented when new features are added.
  • Patch versions are for small fixes that do not change the public API, so no existing code should break.
  • When a minor version increments, the patch number is reset to 0. When a major version increments, both the minor and patch are reset to 0.


  • "0.0.1": A first release. Anything with a "0" for the major version is subject to change in the next release - no promises about API stability!
  • "0.1.0": Added a new feature! Increment the minor version, reset the patch version
  • "0.1.1": Realised the new feature was broken. Fixed it now, so increment the patch version
  • "1.0.0": New major version, so increment the major version, reset the minor and patch versions. You promise your users not to break this API until you bump to 2.0.0
  • "1.0.1": A minor fix
  • "1.1.0": A new feature
  • "1.2.0": Another new feature
  • "2.0.0": A new version, which might break compatibility with 1.0. Users are to upgrade cautiously.

If this release is a preview (Alpha, Beta or Release Candidate), you can also include that, with an optional release number:



  • "1.0.0-alpha": The alpha of 1.0.0 - use with care, things are changing!
  • "1.0.0-alpha.2": The 2nd alpha
  • "1.0.0-beta": Beta - things are settling down, but still subject to change.
  • "1.0.0-rc.1": The 1st release candidate for 1.0.0 - you shouldn't be adding any more features now
  • "1.0.0-rc.2": The 2nd release candidate for 1.0.0
  • "1.0.0": The final release!


If you add a file named extraParams.hxml to your library root (at the same level as haxelib.json), these parameters will be automatically added to the compilation parameters when someone use your library with -lib.

Submission process

  • During development: Use haxelib dev my_test_haxelib /path/to/my_test_haxelib/ to test the library.
  • Ready to test: Zip the current directory, and use haxelib install to try the final version.
  • Submit: You can run haxelib submit to submit the zip file to haxelib. Alternatively you can run haxelib submit without a zip file to have haxelib zip and submit the current directory.

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