Helmet for security headers in Express - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Helmet in Express?

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

intermediate

Name two HTTP headers that Helmet sets to improve security.

Helmet sets headers like Content-Security-Policy (CSP) to control resources the browser can load, and X-Frame-Options to prevent clickjacking attacks.

beginner

How do you add Helmet to an Express app?

You install Helmet with npm, then require it and use it as middleware: <br><code>const helmet = require('helmet');<br>app.use(helmet());</code>

beginner

True or False: Helmet automatically fixes all security issues in your Express app.

False. Helmet helps by setting security headers but you still need to write secure code and handle other security aspects.

intermediate

What does the Content-Security-Policy header do when set by Helmet?

It tells the browser which sources of content (like scripts, images) are allowed to load, helping prevent cross-site scripting (XSS) attacks.

What is the main purpose of Helmet in an Express app?

A To serve static files

B To handle database connections

C To manage user sessions

D To add security headers to HTTP responses

Helmet's main role is to set security-related HTTP headers to protect your app.

Which of these headers is NOT set by Helmet by default?

A X-Content-Type-Options

B X-Powered-By

C Strict-Transport-Security

D Content-Security-Policy

Helmet disables the X-Powered-By header to hide Express usage, it does not set it.

How do you apply Helmet middleware in an Express app?

A app.use(helmet());

B app.helmet();

C helmet(app);

D app.set('helmet', true);

You use Helmet by calling app.use(helmet()) after requiring it.

Which security risk does Content-Security-Policy help prevent?

A Denial of Service

B SQL Injection

C Cross-Site Scripting (XSS)

D Man-in-the-Middle

CSP restricts sources of executable scripts, reducing XSS risks.

True or False: Helmet replaces the need for other security practices in your app.

A False

B Only for small apps

C True

D Only if using HTTPS

Helmet helps but does not replace secure coding and other security measures.

Explain how Helmet improves security in an Express app and name at least two headers it sets.

Think about what headers control in the browser.

Describe the steps to add Helmet to a new Express project and why it is important.

Focus on setup and purpose.