Complete REST Assured Interview Questions & Answers

REST Assured Interview Questions and Answers

REST Assured Interview Questions & Answers (Advanced)

1. What is REST Assured?

Answer: REST Assured is a Java-based library used to automate RESTful APIs. It simplifies HTTP request creation and response validation using BDD-style syntax (given-when-then). It integrates easily with TestNG, JUnit, Maven, and CI/CD tools.

2. What are the advantages of REST Assured?

  • Easy-to-read BDD syntax
  • Supports JSON & XML
  • Built-in validation for status codes, headers, body
  • Supports authentication (OAuth, Basic, Bearer)
  • Seamless CI/CD integration

3. Explain BDD syntax in REST Assured

  • given() → Request specification (headers, params, auth)
  • when() → HTTP method (GET, POST, PUT, PATCH, DELETE)
  • then() → Response validation

4. How do you validate status code?


given()
.when()
    .get("/users/1")
.then()
    .statusCode(200);

5. How do you validate response body?


given()
.when()
    .get("/users/1")
.then()
    .body("data.id", equalTo(1));

6. How do you validate response headers?


.then()
    .header("Content-Type", "application/json");

7. How do you pass query parameters?


given()
    .queryParam("page", 2)
.when()
    .get("/users")
.then()
    .statusCode(200);

8. POST request example


given()
    .contentType("application/json")
    .body(payload)
.when()
    .post("/users")
.then()
    .statusCode(201);

9. Difference between PUT and PATCH

  • PUT → Updates full resource
  • PATCH → Updates partial resource

10. PUT request example


given()
    .contentType(ContentType.JSON)
    .body(payload)
.when()
    .put("/users/1")
.then()
    .statusCode(200);

11. PATCH request example


given()
    .contentType(ContentType.JSON)
    .body(partialPayload)
.when()
    .patch("/users/1")
.then()
    .statusCode(200);

12. DELETE request example


given()
.when()
    .delete("/users/1")
.then()
    .statusCode(204);

13. Authentication types supported

  • Basic Authentication
  • Bearer Token Authentication
  • OAuth 2.0
  • API Key Authentication

14. Basic Authentication example


given()
    .auth().basic("username", "password")
.when()
    .get("/secure")
.then()
    .statusCode(200);

15. Bearer Token Authentication


given()
    .header("Authorization", "Bearer " + token)
.when()
    .get("/users")
.then()
    .statusCode(200);

16. OAuth 2.0 Authentication


given()
    .auth().oauth2(token)
.when()
    .get("/profile")
.then()
    .statusCode(200);

17. Extract response values


String id = given()
.when()
    .get("/users")
.then()
    .extract().path("data[0].id");

18. API Chaining

Using response data from one API as input for another API.


int userId = given()
.when()
    .post("/users")
.then()
    .extract().path("id");

given()
.when()
    .get("/users/" + userId)
.then()
    .statusCode(200);

19. JSON Schema validation


.then()
    .body(matchesJsonSchemaInClasspath("schema.json"));

20. Logging request & response


given()
    .log().all()
.when()
    .get("/users")
.then()
    .log().all();

Best Practices

  • Use Request & Response Specifications
  • Externalize test data
  • Validate status code first
  • Handle auth dynamically
  • Integrate with Jenkins
"I focus on building scalable, maintainable API automation frameworks that validate business logic, security, and data integrity while integrating seamlessly into CI/CD pipelines."
Masum Raza
Senior Automation Test Engineer
Location: Bengaluru, Karnataka, India

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