JSON Formatter & Validator
Paste JSON below to format, minify, and validate it instantly.
What Is a JSON Formatter & Validator?
A JSON formatter takes raw, unformatted, or minified JSON and reindents it with consistent spacing and line breaks, making it easy to read and debug. It also validates the structure, flagging syntax errors like missing commas, unclosed brackets, or trailing commas.
How to Use the JSON Formatter & Validator
- Paste your JSON into the input box.
- Click Format to pretty-print it with indentation, or Minify to compress it onto a single line.
- If the JSON is invalid, an error message explains what's wrong.
- Click Copy to grab the formatted or minified result.
JSON Formatter & Validator Features
- •Pretty-print with consistent indentation
- •One-click minify to a single line
- •Clear validation error messages
- •Runs entirely in your browser
- •One-click copy
Who Can Use This Tool?
- Developers
- API Testers
- Students
- Data Analysts
Frequently Asked Questions
What does it mean when my JSON is invalid?
It means the structure doesn't follow JSON syntax rules — common causes include missing commas, unclosed brackets or braces, trailing commas, or using single quotes instead of double quotes around keys and strings.
What's the difference between formatting and minifying JSON?
Formatting adds indentation and line breaks to make JSON easy to read, while minifying strips out all unnecessary whitespace to produce the smallest possible file size, which is useful for production use.
Is my JSON data sent to a server?
No, all formatting and validation happens locally in your browser. Your JSON data is never uploaded or stored anywhere.