codex-lv3-may-2025

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Level 2: Basic Express Server Setup

User Story: As a developer, I want to create a basic Express server so that I can handle web requests for my Mad Libs application.

What You’ll Do

Create a basic Express server that listens on port 3000.

Instructions

• Install Express using npm install express
• Install nodemon using npm install nodemon --save-dev
• Create basic server.js file
• Set up server to listen on port 3000
• Add a simple route that responds with “Hello World”

💡 Code Hints

Need help with Express setup? Check out these snippets:

• Basic Express server: See Week 1 Notes for server setup examples
• Route handling: Use app.get() to create routes

Show Me: the basic Express server structure

const express = require('express');
const app = express();
const PORT = 3000;

app.listen(PORT, () => {
    console.log(`Server running on http://localhost:${PORT}`);
});

Show Me: a simple route example

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

✅ Check

1. Run npm install to install dependencies
2. Run npx nodemon server.js to start your server
3. Open your browser to http://localhost:3000
4. You should see “Hello World” displayed
5. If you see errors, check your server.js file and dependencies

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