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JSON Schema

JSON Schema Validator

Validate JSON documents against a JSON Schema and see every violation with precise paths.

Runs entirely in your browser — your data never leaves your device.

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How to use this tool

  1. 1Paste your JSON Schema into the schema editor.
  2. 2Paste the JSON document to validate.
  3. 3Review the list of validation errors with their paths.

Frequently asked questions

Which schema drafts are supported?
Major drafts including draft-07 and 2020-12 are supported, with keywords like oneOf, allOf, patterns, and formats.
How are errors reported?
Each error shows the instance path, the failing keyword, and a readable explanation so you can fix it quickly.
Is my data uploaded to a server?
No. Every tool on JSONPost runs entirely in your browser using JavaScript. Your JSON never leaves your device, so it is safe to use with private or sensitive data.

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