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JSON validation and diff

Inspect structured output from an AI model. Errors are reported without silently changing your data. Add common JSON Schema rules to check fields and types.

Start tool

How it works

  1. Paste JSON or open a JSON file.
  2. Optionally add a JSON Schema or a second version.
  3. Read the syntax, schema, and difference reports.

Limits

2 MB per text input and 100 KB for a schema. Supports type, required, properties, items, enum, and common length/number limits. JSON5, YAML, $ref, and remote schemas are not supported.

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