index.js

////////////////////////////////
////     Road to Hire      ////
///     LifeSports App     ///
/////////////////////////////
require('dotenv').config();
const express = require('express');
const mongoose = require('mongoose');
const morgan = require('morgan')
const path = require('path')
const fs = require('fs')



const app = express();
const port = process.env.PORT || 4000;
let uri = ""

//logging
const accessLog = fs.createWriteStream(path.join(__dirname, 'access.log'), { flags: 'a' })
app.use(morgan('tiny', { stream: accessLog }))

// register middleware
app.use(express.urlencoded({ extended: true }));
app.use(express.json());

// Serve up static assets (heroku)
if (process.env.NODE_ENV === "production") {
  app.use(express.static("client/build"));
  uri = process.env.ATLAS_URI  // connection string for Atlas here  
} else {
  uri = process.env.ATLAS_URI   // connection string for localhost mongo here  
}

// connection to database
mongoose.connect(uri, { useNewUrlParser: true, 
                        useCreateIndex: true, 
                        useUnifiedTopology: true }
);
const connection = mongoose.connection;
connection.once('open', () => {
  console.log("MongoDB connection is live");
})

// register api catalogue
const exercisesRouter = require('./routes/exercises');
const usersRouter =     require('./routes/users');

app.use('/exercises', exercisesRouter);
app.use('/users', usersRouter);

// Creating live connection to react.js app
// Define any API routes before this can run
app.get("*", function(req, res) {
  res.sendFile(path.join(__dirname, "./client/build/index.html"));
});

app.listen(port, () => {
    console.log(`Server is running on port: ${port}`);
});