Files processed locally in your browser
JSON Formatter & Validator
Pretty-print, minify, and validate JSON with clear error messages.
How to use this tool
- Paste JSON.
- Click Format, Minify, or Validate.
- Copy the cleaned output.
Debug APIs faster
Format responses before sharing them in tickets or docs.
Why use FreeTools?
Unlike many online utilities, FreeTools processes your files in the browser using modern Web APIs and WASM libraries. That means faster results on your machine, no waiting for uploads, and a clear privacy story: we never see your documents or photos. No account is required — open the page, drop a file, download the result.
FAQ
Will invalid JSON show errors?+
Yes. We surface the parser error message.
Do you store JSON?+
No. Validation is local.
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Keep editing without leaving your browser.