How do I format JSON online?

Paste your JSON into the editor and click Format. The tool instantly beautifies your JSON with proper indentation and syntax highlighting. Invalid JSON is flagged with error messages.

How do I validate JSON?

Paste your JSON and the tool automatically validates it. If there are syntax errors, you'll see a clear error message indicating the line and position of the problem.

What is JSON used for?

JSON (JavaScript Object Notation) is a lightweight data interchange format used in web APIs, configuration files, databases, and data storage. It's human-readable and supported by virtually every programming language.

JSON Formatter & Validator

Format, validate, and beautify JSON data online. Free JSON pretty printer with syntax highlighting.

How to use: Paste JSON in the left panel — see it formatted, validated, and highlighted on the right.

Paste your JSON

Formatted Output