google-chrome-extension,google-chrome-app , What is “platforms” for in manifest.json?

What is “platforms” for in manifest.json?


Tag: google-chrome-extension,google-chrome-app

In manifest.json definition, there is a "platforms" key.

However, I cannot find it documented anywhere. What does it do?


The platforms key in the manifest file is part of a feature called multi-platform zip files, which is only relevant for NaCl. Developers can reduce the size of the crx file by putting platform-specific files in the _platform_specific directory and listing the directories in the platforms key in manifest.json. Users who then install the CRX from the Chrome Web Store will then only get the files specific for their platform.

This feature is documented at


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