JSON Formatter

JSON Formatter is a web-based online utility tool for developers that helps format and validate arbitrary JSON data and sort alphabetical keys. It also supports syntax highlighting of JSON data for better readability.

Supported Features:

• Pretty-print JSON with proper indentation
• Sort object keys alphabetically for consistent output
• Validate JSON syntax with detailed error messages
• Copy formatted output to the clipboard with confirmation
• Error highlighting for invalid JSON with specific error details
• Syntax highlighting for better readability

JSON Formatter Usage

1. Paste your JSON into the input area
2. Click “Format JSON” to validate and format
   • The tool will automatically validate the JSON syntax
   • If valid, it will be formatted with proper indentation
   • Object keys will be sorted alphabetically at all levels
3. Use “Copy Output” button to copy formatted JSON
   • A confirmation message will appear when copied successfully
4. Invalid JSON will show specific error messages
   • The error message will indicate the exact issue
   • The input area will be preserved for corrections

Example Input

{"z":1,"a":{"d":2,"c":3},"b":[4,3,2]}
Code language: JSON / JSON with Comments (json)

Example Output

{
  "a": {
    "c": 3,
    "d": 2
  },
  "b": [
    4,
    3,
    2
  ],
  "z": 1
}
Code language: JSON / JSON with Comments (json)

Current Limitations

• Large JSON files may impact performance
• Array elements are not sorted (only object keys are sorted)
• Clipboard operations require secure context (HTTPS or localhost)
• Comments in JSON are not supported (as per JSON specification)
• Does not preserve trailing commas
• Unicode characters in strings are not escaped/unescaped
• No support for JSON5 or JSON with comments (JSONC)

Error Handling

• Provides specific error messages for common JSON syntax errors:
  • Missing or extra commas
  • Unclosed brackets or braces
  • Invalid property names
  • Missing colons
  • Invalid values
• Errors are displayed below the input area
• The error message includes the position where the error was detected

Browser Support

It works in all modern browsers (Chrome, Firefox, Safari, Edge). For copy functionality, it requires JavaScript to be enabled and clipboard API support.

Please contact us for any bug report/feature request/feedback