What spec do you validate against?

Strict RFC 8259 (the JSON spec). No trailing commas, no comments, no single quotes.

Can it validate JSON Schema?

This tool checks syntax only. Schema validation is a separate feature on our roadmap.

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Paste JSON, we tell you if it's valid and where it breaks.

Input

Output

Paste JSON to check validity…

Validate JSON syntax with helpful error messages. Common issues: trailing commas, single quotes, missing brackets, and unescaped control characters.

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