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Beautify and validate JSON — free online tool
Beautify, minify, and validate JSON data entirely in your browser. Instantly identifies syntax errors with line and column references. Supports pretty-printing with configurable indentation and minification for reducing payload size.
Frequently Asked Questions
- What does a JSON formatter do?
- It takes compact or malformed JSON and adds consistent indentation and line breaks, making it easy to read and debug — especially for large API responses or configuration files.
- Can it detect JSON syntax errors?
- Yes. If your JSON is invalid, the formatter highlights the exact location of the syntax error so you can fix it quickly.
- What is JSON minification?
- Minification removes all whitespace from JSON, reducing file size. This is useful for reducing payload size in API responses and HTTP requests.
- Is my JSON data sent to a server?
- No. All formatting and validation is done locally in your browser using the built-in JSON.parse() and JSON.stringify() APIs.