Top 35+ Rest Assured Interview Questions for Answers

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Rest Assured is a widely used tool for testing REST APIs in Java. Many companies, including Infosys, TCS, Wipro, and Tech Mahindra, use it for API automation testing. So, it often comes up in interviews for QA and SDET roles. Interviewers usually ask about writing test scripts, sending requests, checking responses, and handling test data using Rest Assured. This blog shares 25+ commonly asked Rest Assured interview questions with answers. These are based on real interview patterns and can help both freshers and experienced testers prepare with confidence.

Fun Fact – As of 2025, Rest Assured has over 6,900 stars on GitHub, making it one of the most trusted Java-based frameworks for API testing in open-source communities.

Note – We have grouped the Rest Assured interview questions into categories—basic, for freshers, and advanced—for experienced testers, to help you prepare more easily. 

Basic Rest Assured Framework Interview Questions

Here is a list of basic Rest Assured interview questions and answers.

1. What is Rest Assured, and how does it facilitate API testing?

Rest Assured is a Java-based library used to test RESTful APIs. It simplifies sending HTTP requests and checking responses. You can write readable tests without needing to create a full HTTP client setup. It supports all HTTP methods and works well with tools like JUnit and TestNG.

2. How do you set up Rest Assured in a Java project?

Add the Rest Assured dependency to your Maven or Gradle project. 

For Maven, use:

<dependency>

  <groupId>io.rest-assured</groupId>

  <artifactId>rest-assured</artifactId>

  <version>5.4.0</version>

  <scope>test</scope>

</dependency>

Also, include dependencies for JSON parsing and testing frameworks if needed.

3. What are the primary components of a Rest Assured test script?

A typical script has three parts:

• given(): Prepares the request (headers, params, body).
• when(): Sends the request with a method like GET or POST.
• then(): Validates the response (status code, body, etc.).

4. How can you send a GET request using Rest Assured?

Here’s a simple example:

given()

.when()

  .get(“https://api.example.com/users”)

.then()

  .statusCode(200);

This sends a GET request and checks that the status code is 200.

5. What is the significance of the given(), when(), and then() methods in Rest Assured?

These methods make the test readable and structured. given() sets up the request, when() performs the action, and then() checks the result.

6. What is POJO class in Rest Assured?

A POJO (Plain Old Java Object) is a simple Java class. In Rest Assured, it’s used to map JSON data to Java objects for easy request and response handling.

Rest Assured Interview Questions for Freshers

These are some commonly asked Rest Assured interview questions and answers for freshers.

7. How do you perform a POST request with JSON payload in Rest Assured?

given()

  .header(“Content-Type”, “application/json”)

  .body(“{ \”name\”: \”John\” }”)

.when()

  .post(“https://api.example.com/users”)

.then()

  .statusCode(201);

8. What methods are available in Rest Assured to validate HTTP responses?

You can use .statusCode(), .body(), .header(), and .contentType() to check different parts of the response.

9. How can you add query parameters to a request in Rest Assured?

Use .queryParam():

given()

  .queryParam(“page”, “2”)

.when()

  .get(“https://api.example.com/users”)

.then()

  .statusCode(200);

10. Explain the process of handling path parameters in Rest Assured.

given()

  .pathParam(“userId”, 10)

.when()

  .get(“https://api.example.com/users/{userId}”)

.then()

  .statusCode(200);

11. How do you include headers in a Rest Assured request?

given()

  .header(“Authorization”, “Bearer token_value”)

.when()

  .get(“https://api.example.com/secure-data”)

.then()

  .statusCode(200);

12. What is the difference between GET and POST requests in the context of API testing?

GET is used to fetch data without altering server state. POST sends data to the server, often to create resources, and changes state.

13. What is API chaining in Rest Assured?

API chaining means using the output of one API call as input for the next. In Rest Assured, values like IDs are extracted and passed between requests.

Rest Assured Interview Questions for Experienced

Let’s go through some important Rest Assured interview questions and answers for experienced professionals.

14. How do you implement authentication mechanisms in Rest Assured for secure API testing?

Rest Assured supports basic, digest, form, and OAuth authentication.

For basic auth:

given()

  .auth().basic(“username”, “password”)

.when()

  .get(“/secure-endpoint”)

.then()

  .statusCode(200);

For OAuth2:

given()

  .auth().oauth2(“token_value”)

.when()

  .get(“/secure-data”)

.then()

  .statusCode(200);

15. Can you explain how to validate response headers and cookies using Rest Assured?

You can check headers like this:

.then()

  .header(“Content-Type”, “application/json”);

And cookies:

.then()

  .cookie(“session_id”);

You can also extract them for further validation:

String header = response.getHeader(“Server”);

String cookie = response.getCookie(“auth_token”);

16. Describe the approach to handling dynamic data in API responses with Rest Assured.

To work with dynamic data, extract values from one response and use them in another. 

For example:

String userId = response.jsonPath().getString(“id”);

Then pass it in the next request:

given().pathParam(“id”, userId)

.when().get(“/users/{id}”);

17. How do you integrate Rest Assured tests with testing frameworks like TestNG or JUnit?

Write Rest Assured methods inside @Test annotated methods:

@Test

public void testStatusCode() {

  given()

  .when()

    .get(“/api”)

  .then()

    .statusCode(200);

}

TestNG or JUnit handles execution and reporting.

18. Discuss the strategies for designing a scalable and maintainable API test framework using Rest Assured.

You might also come across Rest Assured interview questions for 5 years experienced candidates. 

“I keep the code modular—separating request setup, test data, and assertions. I use utility classes for common methods, externalize test data using JSON or Excel, and use property files for endpoints. I also integrate the framework with TestNG and Maven, and add logging and reporting with ExtentReports or Allure.”

19. How would you handle a test where the API response time keeps varying beyond the acceptable threshold?

“I set a reasonable timeout threshold and monitored trends. I also isolated the issue by running tests at different times and from different environments.”

Advanced Rest Assured API Interview Questions

These are some advanced API Rest Assured interview questions and answers. 

20. How do you manage and validate complex JSON responses with nested objects in Rest Assured?

Use jsonPath with dot notation or arrays:

String city = response.jsonPath().getString(“address.city”);

List<String> ids = response.jsonPath().getList(“items.id”);

You can also deserialize to a POJO using ObjectMapper for cleaner code.

21. Explain the use of filters in Rest Assured for request and response manipulation.

Filters let you log or modify requests/responses globally:

RestAssured.filters(new RequestLoggingFilter(), new ResponseLoggingFilter());

Custom filters can be written by implementing the Filter interface.

22. How can you handle multi-part form data in Rest Assured?

Use .multiPart() for file uploads or form fields:

given()

  .multiPart(“file”, new File(“path/to/file.txt”))

  .multiPart(“description”, “Sample file”)

.when()

  .post(“/upload”);

23. What is the role of POJOs and deserialization in validating large JSON responses?

Deserializing large JSON into POJOs makes validation easier and cleaner, especially for nested structures.

Rest Assured API Testing Interview Questions

Here are some common Rest Assured API testing interview questions and answers. 

24. What are the different HTTP methods supported by Rest Assured, and how are they implemented?

Rest Assured supports GET, POST, PUT, PATCH, DELETE, OPTIONS, and HEAD. Example:

.post(“/resource”);

.put(“/resource/1”);

.delete(“/resource/1”);

25. How do you perform data-driven testing with Rest Assured?

Use TestNG @DataProvider to pass different data sets. You can also read from JSON, CSV, or Excel. Parameterize the request body and reuse the method.

26. Describe the process of validating XML responses using Rest Assured.

Use .xmlPath():

String value = response.xmlPath().getString(“root.node”);

You can also assert with:

.then()

  .body(“root.node”, equalTo(“ExpectedValue”));

Rest Assured Automation Interview Questions

Let’s cover some Rest Assured automation interview questions and answers for experienced and freshers. 

27. How do you parameterize requests and responses in Rest Assured for automation purposes?

Use variables or external files for dynamic values. Combine with TestNG @DataProvider or use .pathParam(), .queryParam(), and .body() to pass data at runtime.

28. What role does Rest Assured play in continuous integration/continuous deployment (CI/CD) pipelines?

Rest Assured tests can be included in CI/CD pipelines via Maven or Gradle. On each code push or deployment, API tests are triggered to catch integration failures early.

29. How can you implement logging and reporting in Rest Assured tests?

Use RequestLoggingFilter and ResponseLoggingFilter for request/response logs. For reporting, integrate with TestNG + Allure or ExtentReports.

Also Read - Top 70+ Automation Testing Interview Questions and Answers

Rest Assured API Automation Interview Questions

Here are some important Rest Assured API automation testing interview questions and answers. 

30. How do you handle API versioning in your Rest Assured tests?

Store versioned base URLs in properties files. Switch based on environment or endpoint like /v1/users or /v2/users.

31. What approaches do you use to mock APIs during testing with Rest Assured?

Tools like WireMock or MockServer can simulate API responses. Rest Assured tests hit the mock endpoint for isolated testing.

32. How can you manage test data effectively when using Rest Assured for API automation?

Keep test data in JSON files or Excel sheets. Load data using helper utilities to avoid hardcoded values.

Also Read - Top 40+ API Testing Interview Questions and Answers

Rest Assured Coding Interview Questions

You might also come across coding related Rest Assured interview questions and answers. 

33. Write a Rest Assured test to validate the status code and a specific value in the response body.

given()

.when()

  .get(“/users/1”)

.then()

  .statusCode(200)

  .body(“name”, equalTo(“John”));

34. How can you extract a value from a JSON response and assert it in Rest Assured?

Response response = given()

  .when()

  .get(“/users/1”);

String name = response.jsonPath().getString(“name”);

assertEquals(name, “John”);

35. Show how to chain multiple API requests in Rest Assured and pass data from one request to another.

String userId = given()

  .contentType(“application/json”)

  .body(“{ \”name\”: \”John\” }”)

.when()

  .post(“/create”)

.then()

  .statusCode(201)

  .extract().jsonPath().getString(“id”);

given()

  .pathParam(“id”, userId)

.when()

  .get(“/users/{id}”)

.then()

  .statusCode(200);

36. Write a Rest Assured test that includes OAuth2 authentication and validates the secured API response.

given()

  .auth().oauth2(“your_access_token”)

.when()

  .get(“/secure-endpoint”)

.then()

  .statusCode(200);

Wrapping Up

These 35+ Rest Assured interview questions cover the most common topics asked by top tech companies. Whether you are just starting or have years of experience, knowing these will help you feel more prepared in interviews.

Looking for Rest Assured job roles in India? Find top opportunities on Hirist—a job portal built for tech professionals like you.

FAQs

How do I prepare for a Rest Assured interview?

Start by learning Rest Assured basics, syntax, and key methods. Practice real API test cases, write scripts, and review commonly asked questions from freshers to advanced levels.

What are the most asked Rest Assured interview questions?

Interviewers often ask about GET/POST requests, response validations, authentication, request chaining, dynamic data, and framework integration with TestNG or Maven. Coding questions are also very common.

Do I need to know Java to work with Rest Assured?

Yes, Rest Assured is a Java-based library. Basic knowledge of Java is required to write and understand test scripts using this tool.

Is Rest Assured better than Postman for testing APIs?

Rest Assured is better for automation and scripting. Postman is easier for manual testing. They serve different purposes and are often used together during development.

Also Read - Top 20+ Postman Interview Questions and Answers

Which companies use Rest Assured in India?

Companies like TCS, Infosys, Wipro, Tech Mahindra, and many startups use Rest Assured for API testing in their QA and automation teams.

What is Rest Assured in QA?

Rest Assured is a Java-based library used in QA for testing REST APIs. It helps testers send HTTP requests and validate responses using simple, readable code.

Also Read - Top 50+ REST API Interview Questions and Answers

What is the difference between API and Rest Assured?

An API is a set of rules that lets software talk to each other. Rest Assured is a tool used to test those APIs, especially RESTful ones, in Java.

Are coding questions asked in Rest Assured interviews?

Yes, many interviews include coding rounds. You may be asked to write API tests, extract data, chain requests, or validate response bodies and status codes.

Do companies prefer candidates with Rest Assured experience?

Yes. Many companies prefer testers who can automate API testing using Rest Assured. It is commonly used in automation frameworks in India and globally.