Website Tools

JSON Formatter

Instantly format and pretty-print any JSON, right in your browser.

Free & instant No signup How to use FAQ

Paste your JSON

Formatted JSON

Not sure what to enter?

Paste your JSON below to instantly format and pretty-print it - entirely in your browser, nothing is sent to our servers.

Recent Searches

HTML Validator - example.com 4 seconds ago

What does a JSON formatter do?

A JSON formatter (or beautifier) takes compact or messy JSON and re-indents it so nested objects and arrays are easy to read. It also tells you straight away if the JSON is invalid. Everything runs in your browser - the data you paste is never uploaded.

How to format JSON

Paste your JSON into the box above.
Click Format JSON.
Read the neatly indented result, or fix the error it points to if the JSON is invalid.
Click Copy Result to use the formatted JSON.

Related checks

To only check whether JSON is valid, use the JSON Validator.
To shrink JSON for production, use the JSON Minifier.

The formatter parses your input with the browser's built-in JSON parser and prints it again with two-space indentation, so nested objects and arrays line up and are easy to scan. If the input is not valid JSON - a trailing comma, single-quoted strings or unquoted property names are the usual causes - you get the parser's error instead of a silent guess at a fix. Formatting only changes whitespace: the keys and values themselves are not altered. JustChecker builds tools that respect your data - this one never leaves your browser.

Frequently Asked Questions

No - this tool runs entirely in your browser using JavaScript. Your JSON is never transmitted anywhere.

The tool will show you an error message explaining what's wrong, so you can fix it before formatting.

There's no hard limit enforced by this tool, but very large JSON (several megabytes) may be slow to format depending on your device, since all processing happens in your browser.

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