What criteria and parameters do you consider when testing API for quality and reliability?

When testing an API for quality and reliability, it is important to consider the following criteria and parameters:

• Correctness of responses: compliance of returned data with specifications, correct HTTP status codes.
• Error handling: appropriate error messages, correct error codes.
• Performance: API response time, stability under load.
• Security: authentication and authorization checks, protection against vulnerabilities.
• Stability: API should operate stably under various usage scenarios.
• Compatibility: support for different versions, backward compatibility.
• Documentation: completeness and accuracy of method descriptions, parameters, and data formats.

For automated testing, tools like Postman, JMeter, or specialized API testing frameworks are often used to verify these parameters.