Bivonio

JSON formatter and validator

Validate JSON and add indentation to make it easier to read.

Your files and text are processed on your device.

How to use this tool and limits

Paste JSON and choose 2 or 4 spaces of indentation. Quotes, separators and structures are validated before producing the result.

Guides
How to validate, format and minify JSON

Recognize syntax errors and understand what the browser’s JSON parser preserves.

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Frequently asked questions

Are numbers and duplicate keys preserved?

The browser’s JSON parser is used. Numbers beyond JavaScript precision can change; the last duplicate key is retained. Do not use this tool to preserve very large integers.