JSON Schema in 10 Minutes: Validation, Types & Real Examples

JSON Schema is the contract that says 'this JSON document is shaped correctly.' In ten minutes you can learn the seven core types, the keywords that catch 95% of real-world validation bugs, and how to wire a schema into Ajv (Node.js) or jsonschema (Python). This guide walks through the syntax from first principles, with two real-world examples, the most common mistakes engineers make, and a frank comparison of when JSON Schema is the right tool versus OpenAPI or TypeScript types.