Helmet for security headers in Node.js - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Helmet in Node.js?

Helmet is a middleware for Express.js that helps secure your app by setting various HTTP headers to protect against common web vulnerabilities.

intermediate

Name two security headers that Helmet sets by default.

Helmet sets headers like X-Frame-Options to help protect against clickjacking, and X-DNS-Prefetch-Control to control DNS prefetching.

beginner

How do you add Helmet to an Express.js app?

You install Helmet with npm install helmet and then add it as middleware using app.use(helmet()) before your routes.

beginner

Why is setting security headers important in web apps?

Security headers help protect users by instructing browsers to block or limit risky behaviors, reducing risks like cross-site scripting, clickjacking, and data sniffing.

intermediate

Can you customize Helmet's behavior? How?

Yes, Helmet allows you to enable, disable, or configure individual security headers by passing options to helmet() or using specific Helmet middleware functions.

What does Helmet primarily do in a Node.js app?

A Sets security-related HTTP headers

B Manages database connections

C Handles user authentication

D Serves static files

Helmet sets HTTP headers that improve security by protecting against common web vulnerabilities.

Which command installs Helmet in a Node.js project?

A npm install express

B npm install middleware

C npm install security

D npm install helmet

The correct package name is 'helmet', so you install it with 'npm install helmet'.

How do you apply Helmet middleware in an Express app?

A app.get(helmet())

B app.use(helmet())

C app.listen(helmet())

D app.post(helmet())

Middleware is added with app.use(), so you use app.use(helmet()) to apply Helmet.

Which of these is NOT a security header set by Helmet by default?

A X-XSS-Protection

B X-DNS-Prefetch-Control

C X-Powered-By

D Strict-Transport-Security

Helmet removes or hides the 'X-Powered-By' header rather than setting it.

Why might you customize Helmet's settings?

A To adjust security headers for your app's needs

B To add database support

C To change the app's port

D To enable user sessions

Customizing Helmet lets you enable or disable specific headers to fit your app's security requirements.

Explain what Helmet does and why it is useful in a Node.js web application.

Think about how browsers can be told to behave more safely.

Describe how you would add Helmet to an Express app and customize one security header.

Focus on installation, usage, and configuration.