What libraries did you use for API test automation? How did you validate the responses?

For automating API testing, I often use libraries such as RestAssured (Java), Requests + Pytest (Python), SuperTest (JavaScript/Node.js), and Postman/Newman for integration tests.

Response validation usually includes:

• Checking the HTTP status (e.g., 200 OK)
• Validating the structure and content of JSON/XML using JSON Schema or XPath
• Checking specific field values

Example with RestAssured:

given()
  .when().get("/api/users/1")
  .then()
  .statusCode(200)
  .body("data.id", equalTo(1))
  .body("data.email", matchesPattern(".+@.+\\..+"));

Here, we check the status, the presence of the correct id, and the email format.