JSON Schema validator

Paste a JSON Schema and instance, pick draft-07, 2019-09, or 2020-12, then Validate. See path + keyword errors from Ajv with formats support. Runs only in this tab—remote $refs are not fetched.

Frequently asked questions

No. Schema and instance JSON are validated only in your browser with Ajv. Nothing is sent to LocalTools servers for processing.

No—validation stays offline. Bundle referenced schemas into one document or resolve $refs yourself before pasting.

What is JSON?A plain-language introduction to JSON for developers and data wranglers, with a link to LocalTools’ browser-only formatter.
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See the complete tool directory

JSON Schema validator

Frequently asked questions

Does LocalTools upload what I type or paste for processing?

Does it fetch remote $ref schemas?

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