What is a schema validation?

Schema validation verifies that JSON data conforms to a defined structure specification called a schema. A JSON Schema describes the expected shape of your data: required properties, data types, value constraints, and validation rules. For example, a schema might specify that a user object must have "name" (string), "age" (positive integer), and optionally "email" (valid email format). Schema validation compares actual JSON against these rules, rejecting data that does not match. This is crucial for API development, ensuring clients send correctly structured data. Schema validation catches errors like missing required fields, wrong data types, or values outside acceptable ranges before processing. It serves as documentation, describing what valid data looks like. Many programming languages offer JSON Schema validators. While our JSON Editor at jsonconsole.com/json-editor validates syntax, consider adding JSON Schema validation for production APIs to ensure data quality and contract compliance.