Deploy React production on heroku?

Question

React

Hello everyone
I'm trying to push a heroku react prod. Dev version works. I assembled the project, switched to build, I start the deployment - it gives an error that there are problems with recognizing the language. I installed heroku/nodejs manually. Push - error, package.json not found. I dragged it with my hands into the build package from the public. Push - the project was assembled, but now when I go into the project it gives the following error in the logs:
2018-02-06T08:09:17.505178+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=office-dashboard.herokuapp.com request_id=6b111689-221f-4135-a83a-87446200aa36 fwd="46.254.75.1" dyno= connect= service= status=503 bytes= protocol=https
Who Did you encounter something like this?