JSON Formatter & Validator
Paste JSON to pretty-print it with indentation, minify it to one line, or check that it's valid.
How to use it
- Paste your JSON Type or paste it into the box.
- Format or minify Beautify it with indentation, or compress it to one line.
- Copy the result Press Copy. Errors are shown if the JSON is invalid.
Examples
| Pretty-print | indented |
|---|---|
| Minify | one line |
About this tool
JSON is the standard format for data on the web, but it is hard to read when it arrives as one long line. This tool beautifies JSON with clean indentation, minifies it back to a compact single line, and validates it with a clear error message if something is wrong.
Everything runs in your browser, so even confidential data is never uploaded. It is handy for inspecting API responses, config files and log output.
Frequently asked questions
Is my JSON sent to a server?
No. Formatting and validation happen entirely in your browser, so even sensitive data stays on your device.
What does minifying do?
It removes all unnecessary whitespace, producing the smallest valid JSON — useful for reducing payload size.
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Updated June 12, 2026