JSON Repair & Fixer

Automatically detect and fix common JSON syntax errors. Repairs trailing commas, unquoted keys, single quotes, missing brackets, and more.

Input JSON (may be invalid)
Repaired JSON Output

Features

🔧 Auto-Fix Common Errors

  • Trailing commas in objects and arrays
  • Single-quoted strings to double quotes
  • Unquoted object keys
  • Missing or extra brackets

📋 Repair Log

  • See exactly what was fixed
  • Understand each transformation
  • Learn common JSON mistakes
  • Detailed error descriptions

✅ Validation After Repair

  • Validates result is valid JSON
  • Pretty-prints the output
  • Copy or download fixed JSON
  • Clear error messages if unfixable

JSON Repair Guide

Common JSON Errors Fixed

This tool automatically repairs the most frequent JSON syntax problems:

// ❌ Invalid - trailing commas
{"name": "John", "age": 30,}

// ✅ Fixed
{"name": "John", "age": 30}

// ❌ Invalid - single quotes
{'name': 'John'}

// ✅ Fixed
{"name": "John"}

// ❌ Invalid - unquoted keys
{name: "John", age: 30}

// ✅ Fixed
{"name": "John", "age": 30}