Helmet for security headers in Node.js - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What HTTP header does Helmet set by default to prevent clickjacking?

Helmet sets several security headers by default. Which header does it set to help prevent clickjacking attacks?

A X-Frame-Options

B X-Content-Type-Options

C Strict-Transport-Security

D Content-Security-Policy

💡 Hint

Think about which header controls if a page can be shown inside a frame or iframe.

The X-Frame-Options header tells browsers whether the page can be displayed inside frames or iframes, helping prevent clickjacking.

📝 Syntax

intermediate

Which code snippet correctly applies Helmet middleware in an Express app?

You want to add Helmet to your Express.js app to improve security headers. Which code snippet correctly applies Helmet middleware?

A helmet(app);

B app.helmet();

C app.use(helmet());

D app.use(helmet);

💡 Hint

Remember how middleware functions are added in Express.

In Express, middleware is added using app.use() and Helmet is a function that returns middleware, so app.use(helmet()) is correct.

🔧 Debug

advanced

Why does this Helmet configuration cause an error?

Consider this code snippet:

const helmet = require('helmet');
app.use(helmet.contentSecurityPolicy());

Why does this cause an error when running the app?

Node.js

const helmet = require('helmet');
app.use(helmet.contentSecurityPolicy());

A helmet must be imported with import syntax, not require

B helmet.contentSecurityPolicy requires options argument and fails without it

C app.use must be called after app.listen

D contentSecurityPolicy is not a direct method on helmet in the latest version

💡 Hint

Check the latest Helmet API for how to use contentSecurityPolicy.

In Helmet v5+, the individual middleware like contentSecurityPolicy is not exposed as a direct method on the helmet import. Instead, you import it separately or configure Helmet differently.

❓ state_output

advanced

What is the effect of disabling the 'crossOriginEmbedderPolicy' in Helmet?

Given this Helmet setup:

app.use(helmet({ crossOriginEmbedderPolicy: false }));

What effect does disabling 'crossOriginEmbedderPolicy' have on the HTTP headers sent?

Node.js

app.use(helmet({ crossOriginEmbedderPolicy: false }));

A The Cross-Origin-Embedder-Policy header will not be set

B The Cross-Origin-Embedder-Policy header will be set to 'unsafe-none'

C The Cross-Origin-Embedder-Policy header will be set to 'require-corp'

D Helmet will throw an error because crossOriginEmbedderPolicy cannot be false

💡 Hint

Disabling a Helmet option usually means it won't add that header.

Setting crossOriginEmbedderPolicy: false disables that middleware, so Helmet does not set the Cross-Origin-Embedder-Policy header at all.

🧠 Conceptual

expert

Why is Helmet important for modern web applications?

Which of the following best explains why using Helmet is important for modern web applications?

A Helmet automatically fixes all security bugs in your code

B Helmet sets HTTP headers that help protect against common web vulnerabilities by instructing browsers how to behave

C Helmet encrypts all data sent between client and server

D Helmet replaces the need for HTTPS by securing headers

💡 Hint

Think about what HTTP headers do and how browsers use them.

Helmet helps by setting security-related HTTP headers that tell browsers to block or restrict risky behaviors, reducing attack surface.