JSON Formatter
JSON Formatter: free, fast and private. Works in your browser, nothing is uploaded, no sign-up needed.
How to use
Paste JSON to format it with clean indentation, minify it to save space, or validate it and see exactly what went wrong. You can sort keys alphabetically and download the result. Everything is processed locally, so API responses and config files with private data never leave your device.
- Paste or type your input.
- Choose the options you need.
- Copy or download the result.
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Frequently asked questions
Why is my JSON invalid?
Common causes are trailing commas, single quotes instead of double quotes, unquoted keys and missing brackets. The error message shows where parsing failed.
Is my JSON uploaded?
No. Parsing and formatting happen in your browser.
Is it free?
Yes. All tools are free, with no sign-up and no limits.
Is my text uploaded?
No. Everything runs locally in your browser, so your text stays private.
Does it work on mobile?
Yes. It works in any modern mobile or desktop browser.