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json schemajsonapi designvalidation

JSON Schema Guide for APIs, Forms, and Event Payloads

A practical introduction to JSON Schema, including core keywords, validation use cases, and schema generation tips.

July 18, 2024·8 min read

What JSON Schema Does

JSON Schema lets you describe the expected structure of JSON data. It is useful for request validation, response contracts, form generation, and event documentation.

Core Keywords to Know

  • type
  • properties
  • required
  • items
  • enum
  • additionalProperties

Typical Use Cases

  • Validate incoming API requests
  • Document payload contracts for teams
  • Generate typed models and forms
  • Keep data pipelines consistent

A Small Example

{
  "type": "object",
  "properties": {
    "name": { "type": "string" },
    "age": { "type": "integer" }
  },
  "required": ["name"]
}

Helpful Tooling Flow

Start with JSON to JSON Schema to generate a draft, then use JSON Schema Validator to test sample payloads against it.

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