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JSON Validator

Generate sample JSONSimple
JSON to validate
Validation report

FAQ

Does this validate JSON Schema?

No. This page validates JSON syntax only. JSON Schema validation is planned as a separate tool.

Are duplicate keys valid JSON?

JSON parsers usually accept them, but later keys overwrite earlier values. jsonfather warns you when it sees duplicates.

Can I validate private configuration files?

Yes. Validation runs locally in your browser and does not upload your input.

JSON ViewerExplore JSON as a searchable tree.JSON MinifierCompress JSON into a compact valid payload.JSON DiffCompare two JSON documents by semantic path.JSON Schema GeneratorCreate a starter schema from sample JSON.JSONPath TesterRun JSONPath queries against local JSON.