JSON Formatter & Validator
Format, beautify, minify and validate your JSON instantly — with clear error messages. Free, private, and works on any device.
What is a JSON formatter and validator?
A JSON formatter (also called a JSON beautifier or prettifier) takes messy, minified or hard-to-read JSON and reformats it with clean indentation and line breaks, so you can read and debug it easily. This free online JSON formatter also works as a JSON validator — if there is a syntax error anywhere in your data, it tells you exactly what and where the problem is.
Why format and validate your JSON?
- Readability: Nicely indented JSON is far easier to scan than a single long line.
- Debugging: Catch a missing comma, bracket or quote before it breaks your app or API.
- Smaller payloads: Use minify to strip whitespace and shrink JSON for faster transfer.
How to use this JSON formatter
- Paste your JSON into the input box (or click Load sample).
- Click Format to beautify and validate, or Minify to compact it.
- Copy or download the result. Everything runs in your browser — your data stays private.
JSON tips
Remember that JSON keys must be wrapped in double quotes, strings use double quotes (not single), and there are no trailing commas allowed. If you build meta tags or APIs, you might also like our Meta Tag Generator and Google SERP Preview tools. New to the stack? Read our web development tutorials.
Frequently Asked Questions
What is a JSON formatter?
A JSON formatter takes raw or minified JSON and reformats it with clean indentation and line breaks so it is easy to read. This tool also validates your JSON and points out exactly where any syntax error is.
Is this JSON formatter free and private?
Yes. It is completely free with no sign-up, and everything runs right in your browser — your JSON is never uploaded to a server or stored anywhere.
What is the difference between formatting and minifying JSON?
Formatting (beautifying) adds indentation and line breaks to make JSON readable. Minifying removes all unnecessary whitespace to make the JSON as small as possible for faster transfer.
How do I validate JSON?
Just paste your JSON and click Format or Validate. If the JSON is valid you will see it formatted; if not, you will get a clear error message showing what went wrong and where.
Does it work on mobile?
Yes, the JSON formatter is fully mobile-friendly and works on any phone, tablet or computer.