JSON Formatter & Validator
Pretty-print, minify, and validate JSON all in one place
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
Take densely packed JSON and pretty-print it with clean indentation, or minify it down to a single line. A built-in validator points out exactly where any syntax errors are.
How to use
- Paste your JSON string into the input box.
- Click 'Format' for an indented view, or 'Minify' to collapse it to one line.
- If there's an error, a message shows you which part is invalid.
FAQ
- Why would I minify JSON?
- Removing unnecessary whitespace and line breaks reduces file size. It's useful for API payloads and optimizing configuration files.
- Does it fix invalid JSON automatically?
- It doesn't auto-repair, but it tells you where the syntax broke so you can fix it easily yourself.
- Is it safe to paste sensitive data?
- Yes. All processing happens in your browser and nothing is sent to a server.