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

How to Format and Validate JSON

Paste your raw or minified JSON into the input field above. The formatter instantly validates the syntax and displays a beautified version with proper indentation. You can choose 2-space or 4-space indentation, minify the output, or copy the formatted result to your clipboard with one click.

Common JSON Syntax Errors

The most frequent JSON errors include trailing commas after the last item in an array or object, using single quotes instead of double quotes, unquoted property names, and missing closing brackets. Our validator catches all of these and shows the exact location of each error.

Frequently Asked Questions

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.