Overview

JSON Schema Course

Learn how JSON Schema describes data contracts, validates payloads, and evolves with APIs and configuration files.

JSON Schema turns sample JSON into a data contract that software can validate. It is useful when teams need API payloads, config files, generated data, fixtures, and event messages to stay predictable across services.

This course focuses on the practical vocabulary developers meet most often: object types, properties, required fields, arrays, enums, formats, and draft versions.

Who this course is for

  • Backend and frontend developers who exchange JSON payloads
  • API reviewers who want schemas that catch real mistakes
  • Tool builders who need machine-readable validation contracts
  • QA and platform teams who maintain fixtures and configuration files

What you will learn

  1. What JSON Schema validates and what it cannot validate by itself
  2. How to model object properties, nested objects, and required fields
  3. How arrays, enums, and formats express common constraints
  4. How draft versions and compatibility affect long-lived schemas

Use the related JSON Schema Generator to experiment with examples locally while you read.

Start lesson 1
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