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JSON Formatter & Validator

Paste any JSON payload to beautify it with 2/4-space indentation, minify it for transport, or validate it and get precise line/column error positions. Runs 100% in your browser — nothing is uploaded.

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Frequently Asked Questions

Is my JSON data uploaded anywhere?

No. The formatter runs entirely in your browser using the native JSON engine. Your data never leaves your device.

Why does it say my JSON is invalid?

The validator uses JavaScript's strict JSON parser. Common causes: trailing commas, single quotes, comments, or missing quotes around keys.

Can I format large JSON files?

Yes, as long as your browser tab can hold the file in memory. Files up to tens of MB are handled easily.