JSON Formatter
Beautify, validate and minify JSON online with precise error messages. Syntax-highlighted output — processed locally.
Runs entirely in your browser — no uploadsAbout this tool
JSON Formatter validates your JSON and pinpoints the exact line and column of syntax errors, then pretty-prints with 2-space indentation or minifies to a single compact line.
Your data never leaves the browser — important for API responses, tokens or config snippets that shouldn’t touch third-party servers.
FAQ
What does the error message show?
The parser reports the first error with its line number, column and a human-readable reason — far easier than hunting brackets manually.
Can I sort object keys alphabetically?
Yes — tick “Sort keys” before formatting to recursively sort every object’s keys.
Is my JSON logged anywhere?
Never. Parsing and printing happen in JavaScript on your device; there is no network call.