Node.js · Theory

server.listen() Method

Theory

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server.listen() Method

server.listen() Method is a Node.js topic. In plain words you use it for a short server.listen Method example in a script or API on localhost. Don’t start with a slogan — start with that picture.

Smallest example: the smallest server.listen Method example you can type. Type it, run it, and say what you see. If you can do that from memory, you know server.listen() Method.

From the example next to this theory: server.listen() Method — http.createServer handles each request with (req, res). Express sits on top of this..

Trap — only saying “server.listen Method” with no example. Fix that before you talk about advanced Node.js.

Viva: what is server.listen() Method? Then show the smallest server.listen Method example you can type. Then name the trap.

Exam tip

What is server.listen() Method? Show this: the smallest server.listen Method example you can type. Trap: only saying “server.listen Method” with no example.

Example

const http = require("http");

const server = http.createServer((req, res) => {
  res.writeHead(200, { "Content-Type": "application/json" });
  res.end(JSON.stringify({ ok: true, path: req.url }));
});

// server.listen(3000);
console.log("handler ready for", "/api/health");
console.log(JSON.stringify({ ok: true, path: "/api/health" }));

server.listen() Method — http.createServer handles each request with (req, res). Express sits on top of this.

Short notes

Defserver.listen() Method — a short server.listen Method example in a script or API on localhost.
Rulethe smallest server.listen Method example you can type
Traponly saying “server.listen Method” with no example
Usea script or API on localhost

const http = require("http"); const server = http.createServer((req, res) => { res.writeHead(200, { "Content-Type": "application/json" }); res.end(JSON.stringify({ ok: true, path: req.url })); }); // server.listen(3000); console.log("handler ready for", "/api/health"); console.log(JSON.stringify({ ok: true, path: "/api/health" }));

server.listen() Method

Example

Short notes

Questions

server.listen() Method

Example

Short notes

Questions