index.js

/* this is the server of website */

const express = require("express");
const multer = require("multer");
const Link = require("./link.js");

const app = express();
const upload = multer();

// Enable CORS (see https://enable-cors.org/server_expressjs.html)
app.use((req, res, next) => {
    res.header("Access-Control-Allow-Origin", "*");
    res.header(
        "Access-Control-Allow-Headers",
        "Origin, X-Requested-With, Content-Type, Accept"
    );
    next();
});

// Serve content of the "public" subfolder directly
app.use(express.static("public"));

// Initial links array
const links = [];
links.push(new Link("Hacker News", "https://news.ycombinator.com", "Baptiste"));
links.push(new Link("Reddit", "https://reddit.com", "Thomas"));
links.push(new Link("Boing Boing", "boingboing.net", "Daniel"));

// Routes

app.get("/", (request, response) => {
    response.sendFile(`${__dirname}/views/index.html`);
});

app.get("/api/links", (request, response) => {
    response.json(links);
});

app.post("/links", upload.array(), (request, response) => {
    // Create new link object
    console.log(request);
    const title = request.body.title;
    const url = request.body.url;
    const author = request.body.author;
    const link = new Link(title, url, author);
    // Add new link to the beginning of the list
    links.unshift(link);
    // Send back newly created link as JSON
    response.json(link);
});

// Start listening to incoming requests
// If process.env.PORT is not defined, port number 3000 is used
const listener = app.listen(process.env.PORT || 3000, () => {
    console.log(`Your app is listening on port ${listener.address().port}`);
});