JSON Formatter & Validator
Paste messy or minified JSON to make it readable, check that it is valid, or compress it to a single line. Errors are reported with the line and column so you can fix them quickly.
Free · No sign-up · Files stay on your device
How to use JSON Formatter
- 1Paste your JSON into the input box.
- 2Click "Format" to beautify it, or "Minify" to compress it.
- 3If the JSON is invalid, read the error message to find the problem.
- 4Copy the result or download it as a .json file.
Features
- Beautify with 2-space, 4-space or tab indentation
- Minify JSON to a single line
- Validation with line and column numbers
- Sort object keys alphabetically
- Your data is processed locally and never uploaded
What is JSON?
JSON (JavaScript Object Notation) is a lightweight text format for storing and exchanging data. It is used by almost every web API, configuration file and NoSQL database.
Common JSON errors
The most frequent mistakes are trailing commas after the last item, single quotes instead of double quotes, unquoted keys and missing closing brackets. The validator points to the exact position of each error.
Frequently asked questions
Is my JSON data safe?
Yes. Formatting and validation happen entirely in your browser. Nothing is sent to a server, so it is safe for API keys and private data.
What is the difference between formatting and minifying?
Formatting adds indentation and line breaks to make JSON readable. Minifying removes all unnecessary whitespace to make the file as small as possible.
Is there a size limit?
No fixed limit. Files of several megabytes format instantly on most computers.