Why does Response return "You need to enable JavaScript to run this app." when deploying React+Express+Heroku?

Question

Heroku

After deploying the application, everything ended successfully, but when sending a request, for example, getting user data, the message " You need to enable JavaScript to run this app. " is returned.

The files seem to be connected correctly.

This is how I return a built React App built via react-scripts build from the server.

// server

if (process.env.NODE_ENV === 'production') {
  app.use(express.static(path.join(__dirname, '../build')));

  app.get('*', (req: any, res: any) => {
    res.sendFile(path.resolve(__dirname, '../build', 'index.html'));
  });
}

the paths in my applications look like this.
/APP
-/build
-/public
-/src
--/client
--/server
--app.ts
--server.ts
-package.json
Well, package.json itself

// package.json

"homepage": ".",
"scripts": {
  "start:react": "react-scripts start",
  "start": "node --require ./ts-hook.js ./src/server.ts",
  "heroku-postbuild": "react-scripts build"
},

What could be the problem ?

Answer 1

only on Heroku?
it looks like the router in the express is not connected, and instead of requests to the API it gives react app,
somewhere there should be
app.use('/api/', require('./routes'))
before app.get('*' , ...build/index.html..)
maybe this piece of code was left out of the process.env.NODE_ENV === 'production' check?