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Why Use Our JSON Formatter?

  • Format JSON for better readability and debugging.
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  • Validate JSON to ensure it's well-structured and error-free.
  • Supports large JSON files without performance issues.

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Common JSON Formatting Errors

Learn about common JSON formatting errors and how to fix them. Avoid mistakes like missing commas, mismatched brackets, and invalid data types.

  • Missing or Extra Commas

    ✅ Correct:
    { "name": "John", "age": 30 }
    ❌ Incorrect:
    { "name": "John" "age": 30 } // Missing comma

  • Mismatched or Missing Brackets/Braces

    ✅ Correct:
    { "person": { "name": "John", "age": 30 } }
    ❌ Incorrect:
    { "person": { "name": "John", "age": 30 ] } // Mismatched brackets

  • Keys Must Be Strings

    ✅ Correct:
    { "name": "John", "age": 30 }
    ❌ Incorrect:
    { name: "John", age: 30 } // Keys must be in double quotes

  • Invalid Data Types

    ✅ Correct:
    { "age": 30, "isStudent": true, "name": "John" }
    ❌ Incorrect:
    { "age": 30, "isStudent": True, "name": 'John' } // True should be lowercase

  • Numbers Cannot Have Leading Zeros

    ✅ Correct:
    { "price": 100 }
    ❌ Incorrect:
    { "price": 0123 } // Leading zero not allowed

  • Improper String Formatting

    ✅ Correct:
    { "message": "Hello \"World\"" }
    ❌ Incorrect:
    { "message": "Hello "World"" } // Quotes inside strings must be escaped

  • Using Undefined or NaN Values

    ✅ Correct:
    { "value": null }
    ❌ Incorrect:
    { "value": NaN } // JSON does not support NaN

  • JSON Cannot Have Comments

    ✅ Correct:
    { "name": "John" }
    ❌ Incorrect:
    { "name": "John" // This is a comment } // JSON does not support comments

  • Arrays Must Be Properly Formatted

    ✅ Correct:
    { "fruits": ["apple", "banana", "cherry"] }
    ❌ Incorrect:
    { "fruits": ["apple", "banana",] } // Trailing comma not allowed

  • Duplicate Keys

    ✅ Correct:
    { "name": "John", "age": 30 }
    ❌ Incorrect:
    { "name": "John", "name": "Doe" } // Duplicate keys are not allowed