JSON Validator & Formatter

Validate JSON syntax with real-time error highlighting, format, minify, and sort keys

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About JSON Validator & Formatter

Our free JSON validator and formatter helps developers validate JSON syntax with real-time error detection and highlighting. The tool uses CodeMirror editor with built-in JSON linting to show errors exactly where they occur, making debugging fast and easy.

Format your JSON with 2 or 4 space indentation, minify for production, sort keys alphabetically, and view detailed statistics about your JSON structure. Perfect for API development, configuration files, and data validation.

Key Features

  • ✓ Real-time JSON syntax validation
  • ✓ Error highlighting with line numbers
  • ✓ Syntax highlighting for better readability
  • ✓ Format with 2 or 4 space indentation
  • ✓ Minify JSON for production use
  • ✓ Sort object keys alphabetically
  • ✓ View JSON statistics (size, depth, keys, objects, arrays)
  • ✓ Copy formatted JSON to clipboard
  • ✓ Line numbers and code folding
  • ✓ Bracket matching and auto-closing
  • ✓ Search and replace functionality
  • ✓ Works offline - no data sent to server

How to Use

1. Paste JSON: Copy your JSON data and paste it into the editor. Errors will be highlighted immediately with red wavy underlines.

2. Fix Errors: Hover over highlighted errors to see detailed error messages. The editor shows the exact line and position of syntax errors.

3. Format: Click "Format (2 spaces)" or "Format (4 spaces)" to beautify your JSON with proper indentation.

4. Minify: Click "Minify" to remove all whitespace and create compact JSON for production use.

5. Sort Keys: Click "Sort Keys" to alphabetically sort all object keys in your JSON.

6. Copy: Click "Copy" to copy the formatted JSON to your clipboard.

Common Use Cases

API Development: Validate API responses and request payloads. Quickly identify syntax errors in JSON data returned from REST APIs.

Configuration Files: Validate and format JSON configuration files for applications, package.json, tsconfig.json, and more.

Data Processing: Clean up and format JSON data before processing. Sort keys for consistent data structure.

Learning & Debugging: Learn JSON syntax with real-time error feedback. Debug complex nested JSON structures with syntax highlighting and folding.