What is a JSON formatter?

A JSON formatter makes JSON easier to read by adding indentation, line breaks, and syntax highlighting. It can also validate and minify JSON.

Is my JSON data stored?

No. Formatting and validation run in your browser. We do not store your JSON.

Can I validate malformed JSON?

Yes. The validator highlights the exact error location, helping you quickly fix braces, commas, or quotes.

Do you support minify and pretty print?

Yes. You can switch between pretty-printed output and compact minified JSON with one click.

JSON Formatter & Validator - Free Online Tool

Format, validate, and prettify JSON data instantly. Syntax highlighting and error detection included.

Input JSON

Formatted JSON

How to use the JSON Formatter:

🎨 Format & Prettify

Makes your JSON readable with proper indentation and line breaks. Perfect for debugging and reviewing JSON data.

🗜️ Minify

Removes all unnecessary whitespace to reduce file size. Ideal for production environments and API responses.

✅ Validate

Checks your JSON syntax for errors and provides detailed error messages with line numbers for easy debugging.

📁 Code Folding

Collapse and expand JSON sections (objects and arrays) directly in the code view. Click the +/- buttons to fold sections with previews.

Key Features

Readable formatting with indentation and syntax highlighting
Instant JSON validation with precise error location
Pretty print and minify modes for development and production
Tree view and code view for easy navigation of large payloads
Copy, download, and fullscreen workspace for productivity
Works entirely in your browser—no data is stored

How to Use

Paste or drop your JSON into the input area.
Click Format to prettify and validate. Errors are highlighted with line and column.
Toggle between Tree and Code views to explore nested objects.
Use Minify to compress the output for APIs, logs, or storage.
Copy or download the result for your project or documentation.

Common Use Cases

Developers, analysts, QA engineers, and data enthusiasts use our formatter to quickly debug API responses, tidy configuration files, prepare documentation examples, and validate webhook payloads. The tool supports very large JSON and is optimized for performance.