JSON Validator

Validate JSON syntax, escape special characters, and analyze JSON structure with comprehensive error reporting and detailed statistics. Perfect for developers working with JSON data validation and manipulation.

What is JSON Validation?

JSON validation checks if your JSON data follows proper syntax rules and structure. This tool also provides escape/unescape functionality and detailed structural analysis of your JSON data.

Features

• JSON validation: Real-time syntax checking with detailed error messages
• Structural analysis: Detailed breakdown of objects, arrays, and data types
• Character escaping: Escape special characters for safe storage/transmission
• Character unescaping: Restore original formatting from escaped strings
• Statistical analysis: Count objects, arrays, keys, and data types
• Copy functionality: Copy validated or processed JSON easily
• Download support: Save processed JSON as files
• Real-time processing: Updates results as you type

How to use this tool

1. Select your mode: Validate, Escape, or Unescape
2. Enter your JSON data in the input field
3. View real-time validation results and analysis
4. Copy or download the processed output

Validation Modes

1. Validate Mode

• Syntax checking: Verifies JSON follows proper format
• Error reporting: Clear error messages for invalid syntax
• Structural analysis: Detailed breakdown of JSON structure
• Statistics: Count of objects, arrays, keys, and data types

2. Escape Mode

• Special character escaping: Converts special chars to escape sequences
• Safe storage: Prepare JSON for storage or transmission
• Standard escaping: Follows JSON specification for escaping

3. Unescape Mode

• Restore formatting: Convert escaped sequences back to characters
• Original data: Retrieve original JSON formatting
• Reverse escaping: Undo escape operations

JSON Analysis Statistics

When validating JSON, the tool provides detailed statistics:

• Keys: Total number of property names
• Objects: Number of JSON objects
• Arrays: Number of JSON arrays
• Max Depth: Deepest nesting level
• Data Types: Count of strings, numbers, booleans, nulls

Character Escaping

JSON escaping converts special characters to safe sequences:

Example

Input JSON:

{
  "message": "Hello \"World\"!\nThis is a test.",
  "data": {
    "id": 123,
    "active": true,
    "items": ["item1", "item2", "item3"],
    "metadata": null
  }
}

Validation Result:

• ✅ Valid JSON syntax
• 📊 4 keys, 2 objects, 1 array, depth: 2
• 📈 3 strings, 1 number, 1 boolean, 1 null

Escaped Version:

{
  "message": "Hello \"World\"!\\nThis is a test.",
  "data": {
    "id": 123,
    "active": true,
    "items": ["item1", "item2", "item3"],
    "metadata": null
  }
}

Unescaped Version:

Hello "World"!
This is a test.

Best practices

• Always validate JSON before processing
• Use escaping when storing JSON in databases or files
• Analyze structure for complex JSON debugging
• Check error messages for specific syntax issues
• Use unescaping when displaying JSON to users

Common validation errors

• Missing quotes: Property names and strings must be quoted
• Trailing commas: JSON doesn't allow trailing commas
• Incorrect nesting: Objects and arrays must be properly closed
• Invalid characters: Only UTF-8 characters are allowed
• Undefined values: Use null instead of undefined in JSON

Use cases

• API validation: Check API request/response data
• Data import: Validate imported JSON files
• Debug assistance: Analyze complex JSON structures
• Data cleaning: Remove or transform problematic data
• Safe storage: Escape JSON for database storage
• Format restoration: Unescape JSON for display
• Quality assurance: Ensure data integrity

Performance considerations

• Large files: Very large JSON may impact browser performance
• Deep nesting: Extremely deep structures may cause issues
• Real-time validation: Updates on every keystroke for instant feedback
• Memory usage: Analyzes entire structure in memory

FAQ

What JSON standards does this tool follow? Follows RFC 8259 JSON specification for validation, escaping, and unescaping.

Can I validate very large JSON files? Yes, but extremely large files may impact browser performance. Consider processing in chunks for very large datasets.

What characters get escaped? Quotes, backslashes, and control characters (newline, tab, etc.) are escaped according to JSON specification.

How do I fix common JSON errors? The tool provides specific error messages and line numbers to help identify and fix issues.

Can I use this to format JSON? While it validates and can escape/unescape, use the JSON Prettifier tool for formatting and indentation.

Is my data secure when using this tool? All processing happens in your browser - no data is sent to external servers.

Related tools on ChangeBlogger

• JSON Prettifier – for formatting JSON with indentation
• JSON Minifier – for compressing JSON files
• JSON Syntax Highlighter – for color-coded JSON display
• JSON Stringifier – for converting JavaScript objects to JSON
• JSON Unstringifier – for converting JSON strings to JavaScript