JSON Formatter & Validator
Format JSON, validate JSON, and fix broken JSON online in your browser.
Everything you need for JSON
Paste, drop a file, or load from a URL, then format, check, and fix in one place.
Format & beautify
Turn minified or messy JSON into clean, readable output. Choose 2, 3, or 4-space indentation, tabs, or a compact one-line view.
Validate to spec
Check your JSON against RFC 8259, 7159, 4627, and ECMA-404, with clear errors so you can pinpoint exactly what's wrong.
Fix broken JSON
A dedicated Fix JSON mode repairs malformed data, missing quotes, trailing commas, and more, so you can recover usable JSON fast.
A closer look
One tool for messy JSON
JSON Formatter & Validator is a free, browser-based utility for working with JSON. Paste your data, point it at a URL, drag in a file, or load one of the built-in examples, then format JSON and validate JSON in a single click.
It combines three jobs into one: a formatter that beautifies and indents your JSON exactly how you want it, a validator that checks against the major JSON standards, and a fixer that repairs broken data. Everything runs right in your browser, with no installs and no sign-up.
JSON Formatter questions
Can I fix broken JSON online?
Yes. The Fix JSON mode can repair common problems such as trailing commas, missing quotes, and malformed data.
Does JSON Formatter and Validator require an account?
No. The tool is free to open in your browser, with no installs and no sign-up.
Format your JSON now
Open the tool in your browser. It's free, with nothing to install.