I Have a React web app that has crypto portfolio, Now I want to connect it with Backend server.js. The deployed web app should set start from Node Server. I am fairly new with NodeJS but Ive tried solutions like cors and all.

I am Fairely New to node can anyone please help me to connect my React folder to backend node folder. I'll be very grateful.

In react I've made Production Build also but it didn't worked.

Here's Server.js Code:

const express = require('express');
const cors = require('cors');
const path = require('path');

app.use(express.json({ extended: false }));

app.use((req, res, next) => {
  res.header('Access-Control-Allow-Origin', '*');
  res.header(
    'Access-Control-Allow-Headers',
    'Origin, X-Requested-With, Content-Type, Accept'
  );
  next();
});
if (process.env.NODE_ENV === 'production') {
  //static folder
  app.use(express.static('client/build'));
  app.get('/', (req, res) => {
    res.sendFile(path.resolve(__dirname, 'client', 'build', 'index.html'));
  });
}

Now I am Getting the error in server

connot GET /

Github Project Link of frontend: https://github.com/Twelve03/crypto-portfolio