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🔧 JSON Validator & Fixer

Validate JSON syntax, detect errors, and automatically fix common issues. Smart error detection with line-by-line analysis, helpful suggestions, and one-click auto-repair for trailing commas, missing quotes, and more.

JSON Input
Fixed JSON

🐛 Detected Issues

0 errors

đŸŒŗ JSON Structure

🔍 Common JSON Errors & Fixes

❌ Trailing Comma
{"key": "value",} → {"key": "value"}
❌ Missing Quotes
{name: "John"} → {"name": "John"}
❌ Single Quotes
{'key': 'value'} → {"key": "value"}
❌ Missing Comma
{"a": 1 "b": 2} → {"a": 1, "b": 2}
❌ Unescaped Quotes
{"text": "He said "Hi""} → {"text": "He said \"Hi\""}
❌ Missing Brackets
{"arr": [1, 2, 3} → {"arr": [1, 2, 3]}

📝 Try Examples (with errors)

ℹī¸ About JSON Validator & Fixer

  • Validation: Strict JSON syntax validation with detailed error reporting
  • Error Detection: Line-by-line error detection with exact position
  • Auto-Fix: Automatically repair common issues (trailing commas, quotes, etc.)
  • Smart Suggestions: Helpful hints on how to fix each error
  • Tree View: Visualize JSON structure when valid
  • Line Numbers: Easy navigation to error locations
  • Multiple Fixes: Fix all detected issues with one click

💡 Tip: The auto-fixer can handle most common errors, but complex issues may require manual correction.

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About JSON Validator & Fixer

Advanced JSON validation and repair tool. Detect syntax errors, get detailed explanations, and automatically fix common issues with smart algorithms.

Features

  • Strict Validation: Full JSON spec compliance checking
  • Smart Auto-Fix: Automatically repair common syntax errors
  • Error Highlighting: Line-by-line error detection with position
  • Helpful Messages: Clear explanations of what went wrong
  • Tree Visualization: Interactive JSON structure view
  • Batch Fixes: Fix multiple errors at once
  • File Support: Upload and download JSON files

Auto-Fixable Errors

  • Trailing Commas: Remove extra commas after last item
  • Single Quotes: Convert to double quotes
  • Unquoted Keys: Add quotes around object keys
  • Comments: Remove JavaScript-style comments
  • Whitespace: Fix formatting issues

Use Cases

  • API Testing: Validate API responses and requests
  • Config Files: Check JSON configuration files
  • Data Migration: Clean and validate JSON data
  • Debugging: Find and fix JSON syntax errors
  • Learning: Understand JSON syntax rules