main.js

if (process.env.NODE_ENV !== "production") {
    require("dotenv").config();
}
const express = require("express");
const app = express();
const PORT = process.env.PORT || 3000;
const cookieParser = require("cookie-parser");
const jwt = require("jsonwebtoken");
const mongoose = require("mongoose");
const dbURI = process.env.DB_URL;
const Grid = require("gridfs-stream");

// ROUTES
const indexRouter = require("./routes/index");
const authRouter = require("./routes/auth");

// DB CONNECTION
async function connectDB() {
    await mongoose.connect(dbURI, {
        useNewUrlParser: true,
        useUnifiedTopology: true,
    });
    await app.listen(PORT, () => console.log(`Listening on ${PORT}...`));
}
connectDB();

// GRIDFS SETTINGS
const conn = mongoose.connection;
let gfs;
conn.once("open", () => {
    gfs = Grid(conn.db, mongoose.mongo);
    gfs.collection("fs");
});

// SETTINGS
app.set("view engine", "ejs");
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(__dirname + "/public"));

// ROUTES
app.use("/", indexRouter);
app.use("/auth", authRouter);