server.js

const express = require("express");
const mongoose = require("mongoose");
const bodyParser = require("body-parser");
const passport = require("passport");
const path = require('path');

const users = require("./routes/api/users");
const posts = require("./routes/api/posts");
const profile = require("./routes/api/profile");

const app = express();

// Body Parser
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

// DB config
const db = require("./config/keys").mongoURI;

// Connect to MongoDB
mongoose
  .connect(db, {
    useNewUrlParser: true
  })
  .then(() => console.log("Connected to the Database"))
  .catch(err => console.log("Error in connecting to the Database"));

// Passport Middleware
app.use(passport.initialize());

// Passport config
require("./config/passport")(passport);

// Routes
app.use("/api/users", users);
app.use("/api/profile", profile);
app.use("/api/posts", posts);

// Production
if (process.env.NODE_ENV === 'production') {
  // Set static folder
  app.use(express.static('client/build'));

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

const port = process.env.PORT || 5000;

app.listen(port, () => {
  console.log(`Listening at port ${port}`);
});