JSON Formatter & Validator
Pretty-print, minify, and validate JSON — right in your browser.
Formatted JSON appears here.
About JSON Formatter
A JSON formatter pretty-prints and validates JSON so it's readable and correct. Paste your JSON, pick an indent (2, 4, tab, or minified), and it reformats instantly — flagging the exact line and column of any syntax error. Everything runs in your browser, so your data is never uploaded.
Frequently asked questions
- Is my JSON uploaded to a server?
- No. Formatting and validation happen entirely in your browser with JavaScript — your JSON never leaves your device.
- What's the difference between beautify and minify?
- Beautify adds indentation and line breaks so JSON is easy to read; minify strips all whitespace to make the smallest possible payload for transport.
- How do I fix an 'invalid JSON' error?
- The tool reports the line and column of the first problem. Common causes are trailing commas, single quotes instead of double quotes, and unquoted keys.
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