Fastify·Fastify essentials

Schemas

JSON schemas validate input and speed up serialisation.

Intermediate 10 min read Lesson 2 of 150 Challenge included

What you will be able to do

Declare schema.body.
Reject invalid input automatically.
Document the API from the schema.

In plain English

JSON schemas validate input and speed up serialisation.

Declare schema.body.
Reject invalid input automatically.
Document the API from the schema.

schema.jsJavaScript

app.post('/api/courses', {
  schema: {
    body: { type: 'object', required: ['title'], properties: { title: { type: 'string' } } },
  },
}, async (request) => ({ title: request.body.title }))

Your turn

Explain it back

Easy

Answer from memory: What does a body schema do?

TEXT · starter

Your answer…

Check your understanding before moving on.

Knowledge checkQuestion 1

What does a body schema do?

Select an answer to continue

Study tools

Make it yours.

Keep a private note for this lesson, then turn the key ideas into flashcards you can revisit.

Sign in to save notes and flashcards.Both are private to your account and stay with your progress.

Finished reading?

Lock in what you just learned.

Mark this lesson complete to save your place and move one step closer to the certificate.

Next: Plugins

Lesson 2 of 150 · 0% of course