server.js

if (process.env.NODE_ENV !== "production") {
  require("dotenv").config();
}
const express = require("express");
const app = express();
const expressLayouts = require("express-ejs-layouts");
const mongoose = require("mongoose");
const bodyParser = require("body-parser");
const methodOverride = require("method-override");
const session = require("express-session");
const api = require("./routes/api");

const indexRouter = require("./routes/index");
const bookRouter = require("./routes/books");
const userRouter = require("./routes/users");

mongoose
  .connect(process.env.DATABASE_URL, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
    useFindAndModify: false,
    useCreateIndex: true,
  })
  .then(() => console.log("Connected to mongodb..."))
  .catch((err) => console.error(err));

app.set("view engine", "ejs");
app.set("views", __dirname + "/views");
app.set("layout", "layouts/layout");
app.use(expressLayouts);
app.use("/public", express.static("public"));
app.use(bodyParser.urlencoded({ limit: "10mb", extended: false }));
app.use(methodOverride("_method"));
app.use(
  session({
    secret: process.env.SECRET_KEY,
    resave: true,
    saveUninitialized: true,
    cookie: { maxAge: null },
  })
);

app.use("/", indexRouter);
app.use("/books", bookRouter);
app.use("/users", userRouter);
app.use("/api", api);

app.listen(process.env.PORT || 3000,() => console.log("Server started"));