JSON Formatter & Validator

Format, validate, and analyze JSON with syntax highlighting and tree view

Input JSON

Formatted Output

Formatted JSON will appear here

JSON Syntax Guide

Data Types

  • String: Text in double quotes - "hello"
  • Number: Integer or decimal - 42, 3.14
  • Boolean: true or false
  • Null: null - represents no value
  • Array: Ordered list - [1, 2, 3]
  • Object: Key-value pairs - {"key": "value"}

Common Errors

  • Missing comma between array/object elements
  • Trailing comma after last element (not allowed in strict JSON)
  • Single quotes instead of double quotes for strings
  • Unquoted keys in objects
  • Comments are not allowed in JSON

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