Website Tools
JSON Formatter
Instantly format and pretty-print any JSON, right in your browser.
Paste your JSON below to instantly format and pretty-print it - entirely in your browser, nothing is sent to our servers.
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.