JSON Formatter
⚡ Runs locally🔒 No uploads🆓 Free, no sign-up
Got a minified API response you can't read, or a JSON payload that won't parse? Paste it here for instant pretty-printing, validation with precise error locations, one-click minifying and string escaping.
Validation messages point at the exact problem (missing comma, trailing comma, bad quotes) so you fix it in seconds.
How to use
- Paste your JSON
- Click “Format & validate” — errors are reported with locations
- Use “Minify”, “Escape as string” or copy the result
FAQ
What errors can it catch?
Syntax errors like missing commas, trailing commas, single quotes, unquoted keys and truncated input — each with a location hint.
Can it minify JSON too?
Yes. One click compresses formatted JSON to a single line, and another escapes it as a string for embedding in code.
Is my JSON data uploaded?
Never. Parsing and formatting happen entirely in your browser.