Node.js Express Introduction

The most popular Node web framework.

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Express is a minimal web framework for Node.js. It adds routing, middleware and helpers on top of the http module.

npm install express
Create the app: const app = express();
Define routes: app.get("/", (req, res) => res.send("Hi"))
Start: app.listen(3000)

Key Takeaways: Node.js Express Introduction

Mastering Node.js Express Introduction helps you write clean and reliable Node.js code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

Node.js Express Introduction Code Example

Node.js

import express from "express";

const app = express();

app.get("/", (req, res) => {
  res.send("<h1>Welcome to my Express app</h1>");
});

app.get("/api/hello", (req, res) => {
  res.json({ message: "Hello", time: Date.now() });
});

app.listen(3000, () => console.log("Listening on http://localhost:3000"));

Output

Listening on http://localhost:3000

Run this example on your own computer. The "Get Started" lesson shows how to set it up.

Node.js Express Introduction Practice Exercises

Check what you learned in “Node.js Express Introduction”.

/ 2 solved

Fill in the blank

Define a GET route.

app.("/", (req, res) => res.send("Hi"));

✓ Correct! Not quite. Try again.

Multiple choice

Which method starts the Express server?

app.listen() app.start() app.run() app.serve()

✓ Correct! Not quite. Try again.

to save your exercise progress.

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Node.js Async Programming

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Node.js Express Routing

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Node.js Express Introduction

💡 Key Takeaways: Node.js Express Introduction

Node.js Express Introduction Code Example

Node.js Express Introduction Practice Exercises

Key Takeaways: Node.js Express Introduction