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JSON Formatter
Format, minify and validate JSON instantly. Paste messy JSON and get clean, readable output.
Examples
See what this tool can do.
Make an API response readable
Paste a compact API payload and format it into clean, indented JSON.
Shrink JSON for shipping
Minify a config file to the smallest valid form.
Tips & tricks
Get the most out of it.
- 1A precise error message means invalid JSON — check the reported position.
- 2Minify before embedding JSON in code or URLs.
- 3Formatting doesn't change your data, only its whitespace.
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About JSON Formatter
What this tool does
JSON Formatter prettifies, minifies and validates JSON, pointing to the exact line when something is wrong.
How to use it
- Paste your JSON.
- Choose Format (pretty) or Minify.
- Copy the result, or read the error to fix invalid JSON.
How it works
The tool parses your text with the browser's native JSON engine, then re-serialises it with indentation or without whitespace. Parse errors are surfaced with their position.
Important considerations
- Validates standard JSON; it does not evaluate JSON5 or JavaScript object syntax.
Privacy
This tool runs entirely in your browser. Nothing you enter is uploaded to a server.
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Frequently asked questions
Common causes are trailing commas, single quotes, or unquoted keys. The error points to where parsing failed so you can fix it.