JSON Schema Validator

Check whether JSON data conforms to a JSON Schema. Paste your data, add the schema in Tool Settings, and click Run.

  • Runs entirely in your browser
  • No data stored or sent to a server
  • Free forever — no signup
  • Instant conversion

Input and Output

Use the interactive encoder and decoder on this page to process your text.

Learn more about JSON Schema validation

How to Validate JSON Against a Schema

JSON Schema Validation

When to Validate Schemas

Validate API payloads, config files, and webhook bodies against JSON Schema before deployment or integration testing.

Frequently asked questions

Is this the same as JSON syntax validation?

No. Syntax validation checks whether text parses as JSON. Schema validation checks whether parsed data matches your declared structure and types.