JSON Fixer – Fix Broken JSON Online

Fix Broken JSON Online – Free JSON Repair Tool

Quick Summary: Our JSON Fixer is an intelligent online tool that automatically detects and repairs common JSON syntax errors. Paste your broken JSON, see exactly what's wrong, and fix it with a single click. All processing happens in your browser—your data never leaves your computer.

Common JSON Errors We Fix

• Trailing Commas – Extra commas after the last item in arrays or objects
• Missing Quotes – Unquoted keys or values that should be strings
• Single Quotes – Converts Python-style single quotes to valid double quotes
• Unescaped Characters – Fixes backslashes, newlines, and special characters
• Mismatched Brackets – Detects unclosed arrays [ ] and objects { }
• Invalid Numbers – Fixes leading zeros and other number format issues

Example of Broken JSON

        {
          "name": "John"
          "age": 30,
          "city": "NY
        }
    

Fixed JSON

        {
            "name": "John",
            "age": 30,
            "city": "NY"
        }
    

Fix JSON Syntax Errors

A JSON syntax error happens when your JSON is not written in the strict format required by the JSON specification. This includes missing commas, unquoted keys, invalid numbers, broken strings, and mismatched brackets. If your code editor, API, or browser says “JSON syntax error”, paste the JSON here and this tool will detect and repair it instantly.

Fix Invalid JSON

Invalid JSON means your data cannot be parsed by JSON.parse() or any JSON validator. This usually happens because of trailing commas, single quotes, missing quotes, or Python-style values like True, False, and None. Our JSON Fixer converts invalid JSON into valid, standards-compliant JSON automatically.

How This JSON Repair Tool Works

Simply paste your malformed JSON into the input panel. Our tool uses intelligent parsing to detect syntax errors and displays them with precise line and column numbers. You'll see a preview of the problematic code and a clear description of the issue. Click "Fix All" to automatically repair all detected errors, or fix them one by one.

Why Use Our JSON Fixer?

• 100% Client-Side – Your JSON is processed locally. We never see or store your data.
• Instant Results – Real-time error detection and fixes as you type.
• Developer-Friendly – Precise error locations with line and column numbers.
• Multiple Fix Types – Handles trailing commas, quotes, brackets, and more.
• Copy & Download – Get your fixed JSON instantly in any format.

When Should You Use This Tool?

• When you receive a malformed API response that won't parse
• When copying JSON from documentation that uses single quotes
• When debugging configuration files with trailing commas
• When manually editing JSON and introducing syntax errors
• When converting Python dictionaries that use True/False/None