JSON Formatter — Beautify, Validate & Minify JSON
Paste any JSON to beautify, validate or minify it instantly. Errors are highlighted with the exact parser message — everything runs locally.
What it does
JSON Formatter parses your input with the native JSON engine and returns it pretty-printed with 2 or 4 spaces, or fully minified. Invalid JSON shows the exact error.
When to use it
Use it to debug API responses, clean up config files, prepare fixtures for tests, or shrink JSON before sending it over the wire.
Benefits
- Beautify with 2 or 4 spaces
- One-click minify for production
- Clear validation errors
- 100% local — your data never leaves the browser
Example
Paste {"a":1,"b":[2,3]} and click Format to get a clean indented version ready to share in docs or PRs.
Frequently asked questions
- Is my JSON sent to a server?
- No. All parsing and formatting happens in your browser.
- Why am I getting an error?
- Common issues are trailing commas, single quotes, or unquoted keys — JSON requires double quotes and no trailing commas.
- What's the difference between minify and format?
- Minify removes all whitespace to reduce size; format adds indentation for readability.
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