JSON Formatter
Paste JSON to format it beautifully, minify it for production, or validate it — with precise line-and-column error messages that point straight at the problem.
How to use the JSON formatter
- Paste your JSON into the input box (or press “Load sample” to try it out).
- Choose an action: Format pretty-prints with 2-space indentation; Minify strips all whitespace for production payloads; Validate checks syntax without changing anything.
- Fix errors fast. If validation fails, the exact line and column are shown — click into your input and jump to that spot. Our common JSON errors guide explains each fix.
Why precise error locations matter
Most formatters say something vague like “unexpected token”. This tool pinpoints the failure — for example, “Trailing comma is not allowed in JSON (line 4, column 21)” — so you fix the actual character instead of hunting through a 500-line payload. New to the format? Start with JSON for beginners.
JSON formatter FAQ
Minification removes all unnecessary whitespace (spaces, line breaks, indentation) from JSON, shrinking the payload for faster transfers. The data stays identical —
{"a": 1} works exactly like a pretty-printed version.Unlike JavaScript, JSON forbids trailing commas:
{"a": 1,} is invalid. Remove the comma after the last item or property. It is the single most common JSON error — see our fix guide.No. Formatting, minifying, and validation all run locally in your browser. API keys and payloads you paste never leave your device.
Yes, within reason — payloads up to a few megabytes format instantly. Extremely deep nesting (hundreds of levels) is rejected with a clear “nesting too deep” message rather than crashing your tab.