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Tools / JSON Formatter

JSON Formatter

Format, validate and minify JSON. Everything runs locally in your browser — your data never leaves your device.

Input

Output

Formatted output will appear here.

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Frequently asked questions

Is my JSON uploaded to a server?

No. Formatting and validation run entirely in your browser using JavaScript. Nothing is sent over the network.

What JSON errors can it detect?

Any syntax error reported by the V8 JSON parser, including the exact position of the problem — trailing commas, unquoted keys, mismatched brackets and more.

Is there a size limit?

There is no hard limit. Files up to a few megabytes format instantly; very large files depend on your device memory.