Can I minify JSON as well as format it?

Yes. You can switch between beautified (pretty-printed) and minified (compressed) output. Minified JSON removes all whitespace for the smallest possible file size.

Is it safe to paste API keys or sensitive data?

Yes. All JSON processing happens entirely in your browser. No data is ever sent to our servers or any third party.

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Format and validate JSON data

Free JSON Formatter & Validator - Beautify JSON Online

Format, validate, and beautify JSON data online with our free JSON formatter. Tree view, syntax highlighting, error detection.

JSON Editor Online

Edit, format, validate, and visualize JSON data

📁 Supports:.json.har.txt• Works with Proxyman, Charles, and browser HAR exports

Editor

Line 1•Col 1

Tree View

No JSON data

Enter JSON in the editor or click "Sample"

What Is a JSON Formatter?

A JSON formatter (or JSON beautifier) takes minified or poorly formatted JSON data and reformats it with proper indentation, line breaks, and syntax highlighting for easy reading. JSON (JavaScript Object Notation) is the most popular data interchange format used across web APIs, configuration files, and databases. When debugging API responses or editing configuration files, formatted JSON is dramatically easier to read and understand than a single compressed line of data.

How to Use This Free JSON Formatter

1
Paste your JSON data into the input area.
2
The tool automatically validates and formats the JSON.
3
View syntax-highlighted output with proper indentation.
4
Use the tree view to collapse and expand nested objects.
5
Copy the formatted JSON or download it as a file.

Key Features

Instant JSON formatting and beautification
Syntax validation with detailed error messages
Collapsible tree view for nested structures
Syntax highlighting with color-coded data types
Minify option to compress JSON for production
Works offline — all processing in your browser

Why Use FreeDevKit?

Debug API responses and config files faster
Validate JSON syntax and catch errors instantly
Free alternative to JSONLint and JSON Editor Online
No data transmitted — safe for sensitive API data

Frequently Asked Questions

The formatter will display a detailed error message pointing to the exact line and position where the syntax error occurs, helping you fix it quickly.