Setting Up Express

Express is a minimal web framework for Node.js.

Syntax

NODEJS

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const express = require('express');
const app = express();

app.get('/', (req, res) => {
    res.send('Hello World!');
});

app.listen(3000);

Express.js Setup

NODE

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const express = require("express");
const app = express();

app.use(express.json());

app.get("/", (req, res) => {
    res.json({ message: "Welcome to the API" });
});

app.get("/users", (req, res) => {
    res.json([
        { id: 1, name: "Alice" },
        { id: 2, name: "Bob" }
    ]);
});

app.listen(3000, () => {
    console.log("Server on port 3000");
});

Try It Yourself

Practice

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Exercise

Practice this concept.

Answer

Write the code as shown above.

Quick Quiz

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What did you learn?

Concept A

Concept B

Concept C

Concept D

This covers the basics.

Retry Quiz

Interview Questions

Explain this concept.

It is a fundamental Node.js feature.

Next Lesson

Routing & Middleware