server.js

const express = require("express");
const app = express();
const mongoose = require("mongoose");
const dotenv = require("dotenv");

dotenv.config();

// import routes
const favoriteTracksRoute = require("./routes/tracks");

// connect to db
mongoose.connect(
  process.env.DB_CONNECT,
  { useUnifiedTopology: true, useNewUrlParser: true },
  () => console.log("Connected to db !")
);

app.use(function(request, response, next) {
  response.header("Access-Control-Allow-Origin", "*");
  response.header(
    "Access-Control-Allow-Headers",
    "Origin, X-Requested-With, Content-Type, Accept"
  );
  response.header(
    "Access-Control-Allow-Methods",
    "GET, POST, PUT, DELETE, PATCH, OPTIONS"
  );
  next();
});

// Middleware
app.use(express.json());

//
app.use("/api/favoriteTracks", favoriteTracksRoute);

app.listen(3001, () => console.log("Server up and running !"));