JSON Formatter & Validator

Free online JSON formatter, beautifier, and validator. Format JSON code with proper indentation, syntax highlighting, and error detection. Minify, sort, and analyze JSON data instantly.

JSON Formatter & Validator

Format, beautify, validate, and minify JSON data instantly. Free, secure, and runs entirely in your browser.

JSON Editor

Load File

Enter JSON to validate

Format Options

Indentation

Sort Order

Quote Style

JSON Statistics

Objects

Arrays

Keys

Max Depth

Validation

Real-time JSON validation with detailed error messages and line numbers.

Formatting

Beautify JSON with custom indentation, sort keys, and minify for production.

Statistics

View JSON statistics including object count, array count, keys, and nesting depth.

About JSON Formatter

Our free JSON Formatter & Validator beautifies and validates JSON data instantly. JSON (JavaScript Object Notation) is a lightweight data interchange format that's easy for humans to read and write, and easy for machines to parse and generate. This tool formats minified JSON, validates syntax errors, and makes JSON data readable and debuggable.

Why Use a JSON Formatter? JSON data often comes minified (compressed) to save space, making it difficult to read and debug. Our formatter prettifies JSON with proper indentation, color-codes syntax, highlights errors, and makes it easy to understand complex nested structures. It's essential for developers working with APIs, configuration files, and data exchange.

Key Features:

Format and beautify minified JSON instantly
Syntax highlighting for better readability
Validate JSON and highlight errors
Collapsible nodes for complex objects
Copy formatted JSON with one click

This tool is indispensable for web developers, API integrators, and anyone working with JSON data. Whether you're debugging API responses, configuring applications, or processing data files, our formatter makes JSON readable and helps catch syntax errors early.

How to Use

Format and validate your JSON data in these simple steps:

Paste JSON: Paste your JSON data into the input editor. You can also load a JSON file or type manually.
Format: Click "Format" or "Beautify" to automatically format your JSON with proper indentation.
Validate: The tool automatically checks for syntax errors and highlights any issues found.
Navigate: Use collapsible nodes to navigate complex nested structures easily.
Copy Result: Copy the formatted JSON to your clipboard or download as a file.

Frequently Asked Questions

What is JSON format?

JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format. It uses human-readable text to store and transmit data objects consisting of attribute-value pairs and array data types. JSON is language-independent but uses conventions familiar to programmers of the C family of languages, making it ideal for APIs and configuration files.

How do I fix JSON syntax errors?

Common JSON errors include missing commas, trailing commas, unmatched brackets, unquoted keys, and using single quotes instead of double quotes. Our validator highlights these errors with line numbers and descriptions. Fix the highlighted issues, and the JSON will become valid. Remember: JSON requires double quotes for strings and keys, and no trailing commas.

What's the difference between formatting and minifying?

Formatting (beautifying) adds indentation and line breaks to make JSON human-readable. Minifying removes all unnecessary whitespace to reduce file size for transmission. Use formatted JSON for development, debugging, and configuration. Use minified JSON for production APIs and data transfer to save bandwidth.

Can this tool handle large JSON files?

Yes, our formatter can handle large JSON files, but performance depends on your browser's memory limits. For very large files (over 50MB), consider using a command-line tool or splitting the file. The collapsible node feature helps navigate large structures without overwhelming your screen.

Is my JSON data secure?

Absolutely. All formatting happens locally in your browser using JavaScript. Your JSON data is never sent to any server, ensuring complete privacy and security. Sensitive data, API keys, and configuration details remain on your computer at all times.