Format
Turns compact JSON into a readable, indented form (2/4 spaces or tab) and optionally sorts the keys.
JSON Formatter & Validator
Beautify, minify and validate JSON — with precise line-and-column error reporting. Everything runs in your browser.
Validate
Checks whether the JSON is well-formed and, on failure, shows the exact line and column of the problem.
Minify
Strips redundant whitespace and newlines for the smallest size — ideal for APIs and config files.
Frequently asked questions
What does the JSON formatter do?
It beautifies raw or minified JSON into a readable, indented form, minifies it back to a single line, and validates whether it is well-formed. On an error it points to the exact line and column.
What is the difference between formatting and minifying?
Formatting adds indentation and line breaks so JSON is easy for humans to read. Minifying strips all unnecessary whitespace and newlines to make the payload as small as possible — useful for APIs and config.
How is JSON validated?
The tool uses the browser's built-in JSON parser. If the text is not valid JSON, an error message with the position (line and column) is shown so you can find the problem quickly.
Is my JSON uploaded anywhere?
No. All processing happens locally in your browser via JavaScript — nothing is sent to a server. It is safe for sensitive data.
Can I sort the keys alphabetically?
Yes. Enable the "Sort keys" option and every object's keys are sorted alphabetically, recursively — handy for diffing two JSON files.
Is there a size limit?
There is no imposed limit beyond your browser's memory. Very large files (tens of megabytes) may process more slowly since everything runs client-side.