DevTools / JSON
JSON Formatter & Validator
Paste messy or minified JSON below to instantly format, validate, and beautify it — entirely in your browser.
Runs entirely in your browser · No data uploaded
What is JSON Formatter & Validator?
A JSON formatter takes raw, minified, or poorly indented JSON and rewrites it with proper indentation and line breaks, making it readable. It also validates the JSON syntax and points out errors like missing commas or unmatched brackets.
FAQ
Is my JSON data uploaded anywhere?
No. All formatting and validation happens locally in your browser using JavaScript — your data never leaves your device.
Can this tool fix invalid JSON?
It will tell you exactly where the syntax error is so you can fix it, but it won't silently guess and repair invalid JSON.