Next.js · Junior · Question 70 of 75

Do you need `'use client'` at the top of every client component file?

✓Correct answer: No - only at the boundary; modules imported from a client file become part of the client bundle
2Yes, every file with JSX needs it
3Yes, otherwise the component renders twice

Explanation

'use client' marks the entry point from server to client. Adding it everywhere isn't harmful but makes it harder to see where the boundary is.

Further reading

Test yourself

Take the Next.js · Junior quiz: questions and options are shuffled, and you get a review of your mistakes at the end.