JSON Formatter / Beautifier
Free JSON formatter and beautifier. Paste raw JSON to format it with proper indentation and syntax highlighting. Validates JSON structure, shows errors, and supports minification.
What Is a JSON Formatter?
A JSON formatter is a developer tool that takes raw or minified JSON data and transforms it into a human-readable, properly indented format. This tool also validates your JSON, highlights syntax with colors for different data types, computes useful statistics about your data structure, and lets you minify JSON for production use. It is essential for API development, debugging, and data inspection.
How Does This JSON Formatter Work?
Paste your raw JSON into the input area. The tool will automatically validate it and display any errors with the line number where the problem occurs. Choose your preferred indentation style (2 spaces, 4 spaces, or tabs), and the formatted output will appear with full syntax highlighting. You can copy the formatted result or switch to minified mode with a single click.
Key Features
Syntax highlighting uses distinct colors for strings, numbers, booleans, null values, and object keys so you can scan large JSON structures quickly. Real-time validation catches errors instantly and tells you exactly which line is problematic. Statistics show the total number of keys, maximum nesting depth, and data size in bytes. Minification removes all unnecessary whitespace for optimal payload size.
Frequently Asked Questions
What causes "Unexpected token" errors in JSON?
Common causes include trailing commas after the last item in an array or object, single quotes instead of double quotes, unquoted keys, comments (JSON does not support comments), and missing commas between elements. This formatter will point you to the exact line where the error occurs.
What is the difference between formatting and minifying?
Formatting (beautifying) adds indentation and line breaks to make JSON human-readable. Minifying removes all unnecessary whitespace and line breaks to reduce file size, which is ideal for network transmission and production APIs.
Is there a size limit for the JSON I can format?
Since all processing happens in your browser, the practical limit depends on your device's available memory. Most modern browsers can handle JSON files up to several megabytes without issues.
Does this tool send my data to a server?
No. All formatting, validation, and highlighting happen entirely in your browser. Your JSON data never leaves your device, making it safe to use with sensitive or proprietary data.