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Free JSON Formatter & Validator. Format, validate, and minify JSON online for free. Beautify messy JSON, catch syntax errors, and inspect structures instantly — a developer favorite.

JSON Formatter & Validator

Format, validate, minify, and explore JSON data with error highlighting

Input

All processing happens in your browser. No data is sent to any server.

Key Features & Benefits

One-Click JSON Formatting

Paste any JSON and instantly format it with proper indentation and line breaks. The formatted output uses 2-space indentation by default, making it easy to read nested objects and arrays at a glance.

Validation with Error Messages

Validate JSON syntax and get clear error messages when something is wrong. The validator pinpoints the issue so you can quickly find and fix malformed JSON, missing commas, or mismatched brackets.

Minify JSON for Production

Compress formatted JSON into a single line with no whitespace — perfect for reducing file sizes before deployment. Minified JSON can save significant bandwidth in production APIs and configurations.

Interactive Tree View

Explore JSON data visually with an expandable tree view. Click to expand or collapse objects and arrays, making it easy to navigate deeply nested structures without scrolling through raw text.

JSON Statistics

See at-a-glance statistics about your JSON: number of objects, arrays, nesting depth, and total byte size. Useful for understanding the complexity and size of your data before processing it.

Copy & Clear with One Click

Copy the formatted or minified output directly to your clipboard, or clear everything to start fresh. No need to select and copy manually — one click does it all.

JSON Formatter – Frequently Asked Questions

What is JSON formatting?
JSON formatting (also called pretty-printing) adds indentation and line breaks to compact JSON, making it readable by humans. For example, a single line like {"name":"John","age":30} becomes a nicely indented multi-line display. This is essential for debugging APIs, editing configuration files, and understanding data structures.
Is my JSON data sent to any server?
No. All JSON processing (formatting, validation, minification, and tree view) happens entirely in your browser using JavaScript's built-in JSON.parse and JSON.stringify functions. Your data never leaves your device.
What does the tree view show?
The tree view renders your JSON as an interactive, expandable hierarchy. Objects and arrays can be collapsed or expanded by clicking the arrow icons. Keys are shown in the theme's primary color, strings in green, numbers in blue, and null values in red for easy visual parsing.
Can I format very large JSON files?
The formatter works with any JSON that your browser can parse. For very large files (over 10MB), your browser may slow down during parsing, but the tool will still work. The tree view has a max height with scrolling to keep the interface responsive.
What is JSON minification?
JSON minification removes all unnecessary whitespace (spaces, tabs, newlines) from formatted JSON, producing the smallest possible valid JSON string. This reduces file size for transmission over networks and is standard practice for production APIs and web applications.