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JSON Formatter & Validator

Format, validate, and beautify JSON with real-time error detection

Working with complex document exports? Our partner DocuSwift converts files between formats so you can clean them up here without friction.

Drop your JSON file here or click to browse

Accepted: .json,.txt,application/json

Max size: 10 MB

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What is a JSON Formatter?

A JSON formatter is a tool that takes unformatted, minified, or poorly structured JSON data and converts it into a human-readable format with proper indentation, line breaks, and syntax highlighting. It also validates JSON syntax and helps identify errors, making it an essential tool for developers working with APIs, configuration files, and data interchange formats.

How to Use This Tool

  1. Paste your JSON code into the input area on the left, or click "Load Sample" to see an example
  2. Click "Format & Validate" to beautify your JSON with proper indentation and syntax highlighting
  3. Click "Minify" to compress your JSON by removing all whitespace for production use
  4. Use the "Copy Output" button to copy the formatted result to your clipboard
  5. If there are any syntax errors, they will be displayed in the output area with helpful error messages
  6. View statistics about your JSON including character count, line count, and file size

Common Use Cases

  • Debugging API Responses: Format messy API responses to easily read and understand the data structure
  • Validating JSON Files: Check if your JSON configuration files are syntactically correct before deployment
  • Beautifying Minified JSON: Make compressed JSON readable for code reviews and documentation
  • Data Analysis: Quickly inspect JSON data structures and nested objects
  • Learning JSON: Study properly formatted JSON to understand the syntax and structure
  • Production Optimization: Minify JSON files to reduce file size and improve load times

Features

  • Real-time Validation: Instantly detect syntax errors with descriptive error messages
  • Syntax Highlighting: Color-coded JSON for better readability
  • Multiple View Modes: Switch between formatted and minified views
  • Copy to Clipboard: One-click copying of formatted output
  • Statistics Display: View character count, line count, and file size
  • Client-side Processing: All formatting happens in your browser - your data stays private
  • Sample JSON: Load example JSON to test the tool

Frequently Asked Questions

Yes! This JSON formatter is completely free to use with no registration required. There are no limits on usage or file size.

Absolutely. All JSON formatting and validation happens entirely in your browser using JavaScript. Your data never leaves your computer and is never sent to any server. This makes it safe to use with sensitive data like API keys or private configuration files.

Format adds indentation (2 spaces), line breaks, and proper spacing to make JSON human-readable. This is ideal for debugging and code reviews. Minify removes all unnecessary whitespace to create the smallest possible file size, which is perfect for production environments where you want to reduce data transfer and improve performance.

The validator detects all standard JSON syntax errors including: missing commas, trailing commas, unquoted keys, single quotes instead of double quotes, unclosed brackets or braces, invalid escape sequences, and more. Error messages are descriptive and help you locate the exact problem.

Yes! Since all processing happens in your browser, there's no server-side file size limit. However, very large files (several megabytes) may take a moment to process depending on your computer's performance.

Once the page is loaded, all formatting functionality works offline. The tool doesn't require an internet connection to format or validate JSON.

Yes! Use Tab to navigate between buttons and text areas, Enter to activate focused buttons, and Escape while focused on text areas to quickly clear content.

Disclaimer: This tool is provided as-is, without warranty of any kind. Always verify results for critical applications and keep backups of your data.