Fastify quiz

Test your Fastify knowledge with a free interactive quiz — 48 questions with answers and explanations. No signup needed to play.

What type of value does a Fastify route handler return when it wants Fastify to send a 404 response?

1. What type of value does a Fastify route handler return when it wants Fastify to send a 404 response?
2. What does the querystring schema in a Fastify route definition validate?
3. What object gives access to route parameters like `:id` in a Fastify handler?
4. Which of these correctly registers a Fastify plugin with configuration options?
5. What does `app.setErrorHandler(fn)` do?
6. What is the correct way to read a custom request header, e.g. `x-api-key`, in a Fastify handler?
7. In a Fastify route handler declared as `async (request, reply) => {...}`, how do you send a JSON response?
8. What is the primary purpose of attaching a JSON Schema to a Fastify route?
9. How do you set a custom HTTP status code before sending a response in Fastify?
10. What is Fastify?
11. What is the effect of specifying a `response` schema for status code 200 on a Fastify route?
12. What plugin/hook type would you use to run authentication logic before every route handler in a specific plugin scope?

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