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! Push rejected, failed to detect set buildpack heroku/nodejs The removal of package.json in this case would not automatically reconfigure the buildpack used for the application - the buildpack is “pinned” to heroku/nodejs, and attempting a git push without a package.json would result in an error: -> Using set buildpack heroku/nodejs This situation may also occur if you remove or rename a file that previously led to the automatic detection of your application type and thus the automatic setting of the detected buildpack on your application.įor example, had you pushed an application written in PHP, which in addition to a composer.json contained a package.json with NPM packages for asset handling, the application would have been detected as a Node.js application on first push due to the order in which default buildpacks are invoked for detection. You can easily remove a buildpack from an app: $ heroku buildpacks:remove heroku/nodejs

Changing app.json won’t update the settings of existing apps, you will need to use the heroku buildpacks command instead. The buildpack can be explicitly set in app.json so that applications created via Heroku buttons, Heroku CI or Review Apps can use custom buildpacks. You may also specify a buildpack during app creation: $ heroku create myapp -buildpack heroku/python Run `git push heroku master` to create a new release using this buildpack. Next release on random-app-1234 will use heroku/php. $ heroku buildpacks:set heroku/phpīuildpack set. When the application is next pushed, the new buildpack will be used. You can change the buildpack used by an application by setting the buildpack value. For a list of known third-party buildpacks, see Using a third-party buildpack. If the build succeeds, the detected buildpack will be permanently set for future pushes to your application as if you had run heroku buildpacks:set manually as explained below.Ĭustom buildpacks can be used to support languages or frameworks that are not covered by Heroku’s officially supported buildpacks. Buildpackīy default, these buildpacks will be searched in this order until a match is detected and used to compile your app. If you have a change that would be useful to all Heroku developers, we encourage you to submit a pull request. These buildpacks are open-source and available on GitHub.