demo.js

const HTTP = require("http");

const todos = [
  { id: 1, value: "One" },
  { id: 2, value: "Two" },
  { id: 3, value: "Three" },
  { id: 4, value: "Four" },
];

const SERVER = HTTP.createServer((req, res) => {
  // console.log(req.method);
  // const {headers, url, method} = req;
  const { method, url } = req;
  // console.log(headers, url, method);
  // res.statusCode = 404;
  // res.setHeader('Content-Type', 'text/html');
  // res.setHeader('Content-Type', 'application/json');
  // res.setHeader('X-Powered-By', 'Node.js');

  // res.writeHead(200, {
  //     'Content-Type': 'application/json',
  //     'X-Powered-By': 'Node.js'
  // })

  // res.write("<h1>Hello Sourav</h1>")
  // res.write("<h2>Hello Sourav Again</h2>")

  // console.log("Authorization Code : " + req.headers.authorization);

  let body = [];

  req
    .on("data", (chunk) => {
      body.push(chunk);
    })
    .on("end", () => {
      body = Buffer.concat(body).toString();

      let status = 404;
      const response = {
        success: false,
        data: null,
        error: null,
      };

      if (method === "GET" && url === "/todos") {
        status = 200;
        response.success = true;
        response.data = todos;
      }

      if (method === "POST" && url === "/todos") {
        const { id, text } = JSON.parse(body);

        if (!id || !text) {
          status = 400;
          response.error = "Please enter ID & TEXT";
        } else {
          todos.push({ id, text });
          status = 201;
          response.success = true;
          response.data = todos;
        }
      }
      res.writeHead(status, {
        "Content-Type": "application/json",
        "X-Powered-By": "Node.js",
      });
      res.end(JSON.stringify(response));

      // console.log(body);
    });
  // res.end(JSON.stringify({
  //     success: true,
  //     // success: false,
  //     // error: "Not Found",
  //     // error: "Bad Request",
  //     // data: todos,
  //     data: todos
  // }));
});

const PORT = 2020;
SERVER.listen(PORT, () => {
  console.log(`Server Running on ${PORT}`);
});