What need to be checked in API response?

There are several things that need to be checked in an API response:

HTTP status code: Check if the HTTP status code indicating the success or failure of the API call is correct.

Response payload: Check the response payload to ensure that it contains the expected data.

Response headers: Check the response headers for any relevant information such as Content-Type, Cache-Control, and others.

Error messages: Check for any error messages or error codes in the response payload or headers that would indicate a problem with the API call.

Performance: Check if the API response time is within acceptable limits.

Authentication and Authorization: Check if the API requires authentication and authorization and ensure that it is working as expected.

Data validation: Check if the API is returning the correct data types and formats, as well as checking for any null or empty values.

Security: Check if the API is secure and properly handles sensitive information.