The Google APIs Client Generator is a tool for generating client libraries for APIs based on the Google API Discovery format. It is based on the same core technology Google uses to publish their API libraries. Current support is for C++, C#/.NET, Dart, Java, Java/GWT, and PHP.
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Latest commit 6b13208 May 17, 2017 @SurferJeffAtGoogle SurferJeffAtGoogle committed on GitHub Merge pull request #30 from SurferJeffAtGoogle/cherryPickGoogle3
Cherry pick cpp-only fixes from google3.


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Google APIs Code Generator

August 20, 2013


  This is a tool for generating client libraries from Google APIs Discovery
  documents. It builds a rich (but language neutral) model of the API and
  then invokes a language specific backend to emit the library. The language
  generators are template driven, so it is easy for a developer knowning
  language X to write templates for code in X, without having to learn much

  The generator currently has templates for Java, C++, CSharp, GWT, PHP
  and Dart.  There may be multiple variations of each language. For each,
  the variant used by default (typically also named "default") matches the
  head of the respective base client libraries.


Python 2.7 is required.  Python3 is not supported.

Everything can be installed quickly with easy_install or pip. E.g.:

  pip install google-apis-client-generator

The following dependencies will be installed:

  * django -
    - version 1.8
    - we only use the templating package, not the web serving features.
  * google-apputils -
  * google-api-python-client -
  * python-gflags -
  * httplib2 -


To run the library generator, use the "generate_library" script.  This is
normally what you'd want to do.  E.g.:

  generate_library \
    --input=src/googleapis/codegen/testdata/moderator.v1.json \
    --language=java \

To expand arbitrary templates, the "expand_templates" script is also available:

  expand_templates \
    --discovery=src/googleapis/codegen/testdata/moderator.v1.json \
    --language=any --templates=discovery_check \


  Tony Aiuto (
  Jacob Smullyan (