Frameworks
Express.js Cheat Sheet
Print-ready cheat sheet for Express.js, organized for fast lookup, study, and desk-side use
Sample
What's in this cheat sheet
- Setup
- Routing
- Middleware
- Request & Response
- Error Handling
- Static Files
- Templates
- Router
- Authentication Patterns
- Common Patterns
Create & Start Server
const express = require("express");
const app = express();
app.listen(3000, () => console.log("Running on :3000"));
Built-in Middleware
app.use(express.json()); // parse JSON bodies
app.use(express.urlencoded({ extended: true })); // form data
app.use(express.static("public")); // serve static files
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