Have you conducted API interface testing?

Yes, I have tested APIs. Usually, this involves checking the correctness of server responses to various requests, error handling, data format validation, and performance. I used tools like Postman or REST-assured, and also wrote automated tests that send requests to the API and verify responses.

Example of a simple GET request test using Postman:

{
  "method": "GET",
  "url": "https://api.example.com/users/1",
  "tests": "pm.test('Status 200', function () { pm.response.to.have.status(200); });"
}

This approach helps ensure that the API works according to the specification and correctly handles various scenarios.