JSON Formatter & Validator
Beautify, minify and validate JSON with precise error locations.
{}JSON Formatter & Validator
All processing happens locallyWhat this tool does
JSON Formatter & Validator is a browser-based JSON workspace, results are produced instantly with no page reload and nothing is sent to a server.
Paste your content, press the main button, then copy or download the output from the corner of the panel.
How to use it
- Paste your JSON into the input box, or press "Load sample" to try it out.
- Choose the indent size, or tick "Minify" when you need the smallest possible payload.
- Press "Format". The result appears immediately, and syntax errors report line and column.
- Use the copy button, or download the result as a .json file.
Tips and notes
Clean up stray spaces and line breaks before pasting for more accurate results.
FAQ
Yes. On failure the tool reports the parser message plus the line and column, which makes stray commas and missing quotes easy to fix.
Hundreds of thousands of characters are fine. For very large files, minify or split first to keep the browser responsive.
Standard JSON does not allow comments. Remove them before formatting, or handle the text as a JavaScript object first.
Yes. The tool is completely free with no usage limits, and you never need an account or a sign-in.
No. All processing runs locally in your browser, so the input never reaches a server and is never logged or stored.
Yes. The layout is mobile-first, so inputs and buttons stay comfortable on phones and tablets in both orientations.
Yes. A copy button in the output panel puts the result on your clipboard, and you can also download it as a text file.