JSON Validator

Monitor API Responses

Validate API responses continuously. Pinguzo monitors your endpoints and alerts when responses change or fail.

API monitoring Keyword match checks Response time tracking
Monitor Your APIs
Free to start · No credit card required

JSON Syntax Rules

Rule Example
Objects {"key": "value"}
Arrays [1, 2, 3]
Strings "Hello World" (must use double quotes)
Numbers 42 or 3.14
Booleans true or false (lowercase)
Null null (lowercase)

Common Errors

  • Using single quotes: JSON requires double quotes for strings
  • Trailing commas: No comma after the last item in objects/arrays
  • Missing quotes: Object keys must be quoted
  • Undefined values: Use null instead of undefined
  • Comments: JSON does not support comments

Valid JSON Example

{
    "name": "John Doe",
    "age": 30,
    "isActive": true,
    "email": null,
    "address": {
        "street": "123 Main St",
        "city": "New York"
    },
    "hobbies": ["reading", "coding", "hiking"]
}