Live
JSON Validator
Validate JSON and read clear, coordinate-precise error messages.
Web · Free tool
JSON Formatter
Pretty-print, validate, and minify JSON in your browser. If something is broken, you get the exact line : column where the parser gave up.
Format JSON
Formats as you type — nothing is sent anywhere.
Result
How it works
How the JSON formatter works
Paste anything
Paste JSON from an API response, a config file like manifest.json, or a test fixture. The tool formats it live while you type and never touches the network.
Errors with coordinates
Invalid JSON is not just "wrong" — the tool parses the error position into a human line : column so you can jump straight to the problem, whether it is a missing comma or a stray quote.
Format, minify, copy
Pretty-print with 2 or 4 spaces, or compress to a one-line payload for storage or transfer. Copy the result with one click.
Questions
JSON formatter FAQ
Does the JSON formatter work offline?
Yes — formatting, validation, and minifying all run in your browser with no network requests. Your JSON never leaves your device.
Why is my JSON showing an error?
The formatter pinpoints the first syntax problem with its exact line and column, such as a missing comma, an unclosed brace, or a trailing comma. Fix the spot it points at and the rest usually resolves.
What does minify do?
Minify strips all whitespace and newlines, producing compact JSON that is smaller for storing in files or sending over the network — useful when you need a one-line payload.
Can I choose the indentation?
Yes — pretty-print with 2 spaces or 4 spaces from the dropdown. 2 spaces is the common default for most projects; 4 spaces matches many style guides.