Summary - Security

Combine helmet, cors, rate-limit and JWT to write a secure API.

Summary - Security

In this group you learned the core Express security tools: headers with helmet, cross-origin with cors, rate limiting with express-rate-limit, input validation with express-validator, and authentication with jsonwebtoken.

These five layers together form the basic security skeleton of an Express app. In production you also need HTTPS, expired-token handling, and logging. Security is not one tool but a layered approach.

Security checklist

Security checklist: (1) helmet() enabled on all routes. (2) CORS allows only trusted origins. (3) Rate limiting set on API routes. (4) All input validated. (5) JWTs short-lived and the secret strong.

Additionally: enforce HTTPS, keep error messages vague, update dependencies regularly. Run npm audit to scan for known vulnerabilities. Security is an ongoing process, not a one-time task.

Exercise Verify JWT and log user

Import the jwt module. Produce a token: jwt.sign({ user: "Alex" }, "secret"). Then verify it with jwt.verify(token, "secret"). Log decoded.user.

Show example solution

const jwt = require("jsonwebtoken");
const token = jwt.sign({ user: "Alex" }, "secret");
const decoded = jwt.verify(token, "secret");
console.log(decoded.user);

Test yourself

What are the core Express security tools?
- express, http, https, net, dns
- fs, path, url, os, events
- cluster, worker_threads, perf_hooks
- helmet, cors, rate-limit, validator, jwt
Show answer

helmet, cors, rate-limit, validator, jwt — These five modules are the core of Express security.
Match each piece to its role

helmet

Headers
cors

Cross-origin
express-rate-limit

Rate limiting
jsonwebtoken

Authentication

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