Rest Assured Interview Questions: Ace Your Next Interview

Rest Assured Interview Questions

Table of Contents

Key Highlights

This guide gives you the most important rest assured interview questions. It starts with easy questions. Then it moves to harder ones. This way, you can get ready to work in automation testing.
In this guide, you will see how to use HTTP methods, read status codes, and send restful api requests by using the Java library for rest assured. These tips help you feel good about doing api testing.
You will learn the best way to check api responses. Here, you will know how to check status codes, read the headers, and look inside the content body to make sure it is all ok.
The guide shows you how to handle things like authentication, authorization, and schema checks when you do your api tests.
You practice using RequestSpecification and ResponseSpecification tools. You will get to know how to use logging, work with TestNG or JUnit, and make your api tests better and able to do more testing.
Find the newest rest assured interview questions and answers, including what can be seen in interviews for 2025.

Introduction

Rest Assured is a Java library. You can use it for restful api testing and to make api tests. If you are getting ready for a job interview about api testing, you should know about Rest Assured. This tool helps you make api tests that people can read and use with no trouble. A computer can run these api tests too, and you do not need to do much to set them up.

Rest Assured is a simple tool that you can use to test web services in Java projects. It works for people who are new to this and for those who have been at it for some time. When you know how to use Rest Assured, it helps you feel sure the and ready for interview practice.

Top Rest Assured Interview Questions to Help You Ace Your Next Interview

When you go for an API testing job interview, you will be asked many rest assured interview questions. Some of the questions are easy, but some can be tough. You should know how to set up requests and use the right http methods, such as GET or POST. You also need to check the answers you get from the API. This shows what you know about api testing and rest assured. If you practice these interview questions, it will help you do well in any job that asks for Rest Assured skills.

You might get questions on how to set up Rest Assured in a Java project. People may ask you how to use Rest Assured for authentication. Some could want to know ways to read JSON or XML files while doing an API test. You may get asked about best practices for writing your test scripts. It is good to learn all these things before you go for the interview.

Here are some of the most important rest assured interview questions. These interview questions can help you feel more ready for technical or behavioral questions about api testing. If you practice to answer them, you will feel more sure when you talk about test scripts, best practices, and what it is like to work on a rest assured interview for a java project.

1. What is Rest Assured and why is it used in API testing?

Rest Assured is a free Java library you can use. It helps to check REST APIs. With Rest Assured, things feel easy. Your tests read like a chat with someone. This makes them clear, so people understand. You can make HTTP requests, send them, and look at what you get back. So, using REST APIs is not hard for most people.

Rest Assured is a top tool to use in API testing. It can work with all the main HTTP methods. You can use Rest Assured with JUnit or TestNG, and there is no problem in doing so. Rest Assured lets you check status codes, the headers, and the response body. This helps you get good coverage for your project tests.

Some main benefits of this tool are how easy it is to set up and use. You can sign in with many options that the tool gives you. It lets you read both JSON and XML without extra steps. This is helpful for people working with web services. They can make test scripts very fast. If there is a need to fix test scripts, it is simple to do that. This helps restful web services keep working well. People who use them then have a good experience.

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

To start using Rest Assured in your Java project, you have to add it first. You can do this with Maven or Gradle. If you are using Maven, add the Rest Assured dependency into your pom.xml file. This step gets all the things you need in one go. After that, you can use Rest Assured right away for api tests in your project.

Next, set the baseURI and basePath for your API endpoints. You do not need to enter these every time you make a call. This step helps your test scripts be clean and easy to read. For example:

RestAssured.baseURI = "https://api.example.com";
RestAssured.basePath = "/v1/users";

After you set things up, you can work with the given(), when(), and then() methods to send api requests. It is easy to make and run api tests like this. The tests are small. You can use them in any java project that uses web services.

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

A Rest Assured test script has three key parts. The first part is the request specification. This shows how to set up the HTTP request. You use it to set the base URL, add headers, choose parameters, and set authentication details. When you use the request specification, your Rest Assured test script stays the same for each test case. This helps keep your Rest Assured test script clear, so you and others can read it or look it over with no trouble.

When you send a request, the server sends a Response back to you. This Response will have the status codes and give you the headers. It will also show you what is in the body. It is good to have all these details. T helps you and other people see everything and know if it is working right.

Assertions let you tell if the answer in your API tests is right or not. You look at status codes to find out if the system works the way it should. You can check header values too. It need to see that the body has the right data in it. When you split test scripts into small parts, they be simple for people to read. You can use these small parts again later, if you want. This makes your API tests work better and keeps them good over time.

4. Explain the difference between GET, POST, PUT, and DELETE requests in Rest Assured.

It is good to know about http methods when you do api testing with a restful api. Each method has its own job and you use it in restful api testing for different tasks. This helps you make api testing easier and faster.

GET: The GET method lets you take data from the server. It does not change the server.
POST: A POST request sends your data to the server. Use this to make something new.
PUT: The PUT method lets you change something already on the server. If it is not there, the server will make it.
DELETE: Use DELETE to remove something that is on the server.

Here’s a summary in table form:

HTTP Method	Purpose	Data Format	Rest Assured Example
GET	Retrieve resource data	URL/Query Parameters	`get("/users")`
POST	Create a new resource	Request Body (JSON/XML)	`body(payload).post("/users")`
PUT	Update or create resource	Request Body (JSON/XML)	`body(payload).put("/users/123")`
DELETE	Remove resource	URL Path	`delete("/users/123")`

It is good to know how and when to use these ways. This can help you make api tests strong and clear.

5. How do you send a GET request and validate its response using Rest Assured?

Sending a get request with Rest Assured is easy. You just need to tell it where to get the data from. After you send the get request, look at what you get back. Then, make sure you have what you want from the server.

given()
    .when()
    .get("/users")
    .then()
    .statusCode(200)
    .body("data.size()", greaterThan(0));

Here are the main things you should know about GET requests and how you can see the response:

A get request is the way people ask a server to send data to them.
When you make a get request, the info on the server does not change.
You can find the response by looking at the data the server sends to you.
The response can come as text, code, or files. It depends on what you need.
You should look at the status code in the response. This will show you if your request worked or it did not.
If you get a 200 status code, your get request worked well. A different number can mean there is a problem.

A GET request is when you tell the server to send you some data.
You do not need to put any extra data in the body for a GET request.
Response validation is when you make sure that you get the right information back from the server.
Good response validation helps you find out if everything works the way you want it to.
To do response validation on a GET request, you should check the status code, headers, and what is in the content.

You should always check the status codes. For this, use .statusCode(200) when there is success. This helps you know if the request was good or not.
You need to look at the headers that are important. When you do this, you can see the content type. You can also find if there is any authentication info in the headers.
It is good to read the body content. You need to check this to see if you get the data you want from the body or not.

Your test scripts for the API will check how the system gives a reply. They will also see what is inside that reply. This will help you get problems fast.

6. How do you handle authentication and authorization with Rest Assured?

Authentication and authorization help to keep your API testing safe. Rest Assured lets you use a few simple ways to do this. You can set up basic authentication, OAuth, or Bearer tokens for your tests. If you want to use basic authentication in Rest Assured for API testing, add .auth().basic("username", "password") to your request setup.

For bigger jobs, like when you use OAuth 2.0, you can type .auth().oauth2("accessToken") to add a bearer token to the header. This is useful when you need to check endpoints that ask for user info or tokens. It will help you get what you want in a fast and easy way.

Getting the right authentication in place is important for your tests. It makes sure that the way you test matches how people use your product. This helps you spot safety problems before anyone else does. You can also check if there are access issues before you put your product out there. If you adjust how you work to match the needed authentication, you can test a lot of protected APIs without problems.

7. What are common ways to validate response status codes, headers, and body content?

Checking responses matters because you need to make sure your APIs work how you want. In rest assured, you can look at different parts of the response or test them.

Status Codes: With .statusCode(expectedCode), you test the status codes in your request. A code like 200 is what you want to see because it means all is OK. This lets you know quickly if you get what you asked for with your request.
Headers: You use .header("Header-Name", equalTo("ExpectedValue")) to check the headers. These are things like Content-Type or Authorization in the response. You see if they are there and if they have the right value.
Body Content: With .body("json.path", equalTo("ExpectedValue")), you read the body of the response and check your data. This shows if the numbers or text you get are just what you expect, and if you get what you need.

status codes

When you use all these checks in one test script, you get strong proof that things work. You have a good chance to spot problems. Some problems are hard to find if you test things one by one. If you use all the checks together, you can catch more issues. This makes the tests better for everyone.

8. How do you perform JSON schema validation and XML schema validation in Rest Assured?

Rest Assured is a good tool you can use to see if your xml responses and JSON are right. The tool works with schema files that show what the data should look like. With rest assured, you can check if your JSON fits the schema. You only need to use .body(matchesJsonSchemaInClasspath("schema.json")) in your test. This helps make sure your API reply is just as you need it. So, you know it is set up well and done the right way.

For xml responses, you can use .body(matchesXsdInClasspath("schema.xsd")). This helps make sure that the API gives you xml responses in the same way every time. It is good for the frontend and backend teams because they can work together well. This way, there will not be problems with the link between them as things change over time.

Schema validation is useful if you work with big APIs or ones that change often. It lets you check if the setup or type of data is not what you want or need. This can help make sure the API works the way it should. It also helps keep it running well. If you use schema validation, your API can work better with other systems too.

9. What is method chaining in Rest Assured and how does it benefit test readability?

Method chaining in Rest Assured is when you put several methods together in a row, in one line. It can make your test scripts read like a real sentence. This helps it be easy for you and others to read. It is also simple for people who check your code. Your test scripts look short, clear, and to the point. You can see every step joined up, so all people will know what is happening with Rest Assured in these test scripts.

given()
    .header("Content-Type", "application/json")
    .when()
    .get("/users")
    .then()
    .statusCode(200)
    .body("data.size()", greaterThan(0));

Using chains, you get to watch every step in your API test. You can see how the test sends the request. Then, you look at how it does response validation at the end. Chains are useful because they clean up problems in the steps. They also make sure you do not repeat anything. This helps teams to keep test automation up to date. A team can change tests fast when they need to. Dr. James Bach, who knows a lot about software testing, puts it this way: “Readability is not a luxury; it is a necessity for maintainable test automation.”

10. How do you use path parameters and query parameters in Rest Assured requests?

Handling api responses with Rest Assured can be done without much trouble. You can change where the call goes and what you get in return. It is possible to use path and query parameters here. If you want to add something to the end of the URL path, just use .pathParam("name", value). For example:

given()
    .pathParam("userId", 123)
    .when()
    .get("/users/{userId}")
    .then()
    .statusCode(200);

To get what you want or to make the search results fewer, you can use .queryParam("key", value). You put the key and the value in the link when you do this. For example:

given()
    .queryParam("search", "api testing")
    .when()
    .get("/articles")
    .then()
    .statusCode(200);

By doing these things, you can make test scripts that work for lots of different uses. The test scripts can be used over and over again. You will get the most out of them for many needs.

11. What are best practices for writing maintainable Rest Assured tests?

Keeping your api tests fresh takes time. You have to pay close attention to this. If you want your rest assured tests to work well and be strong, here is what you should do:

Use Constants: Keep things like URLs, endpoints, and login details in constants. With this, you do not have to type them out every time. If you need to change something later, you can do it in one place easily.
Modularize Code: Break your code down into smaller pieces and create helper methods. You can use these bits again when you need to do things like set up a request or handle response validation.
Externalize Configurations: Do not hard-code values in your main code. Put these values in configuration files or the environment settings. This helps when you want to update or change the data after some time.

When you use these ways, the test suite will be easy to grow. It be simple to fix. You can change the tests when your work or needs change. This helps your automation stay strong. It stays helpful for years.

12. How can you extract data from responses using GPath or JSONPath?

Rest Assured is a good tool for working with api responses. It helps you use GPath and JSONPath. You can get what you need from an API answer fast. JSONPath works with JSON. It is like how XPath is for XML. This feature helps you pick the right details from many JSON objects. For example, if you use response.jsonPath().getString("data.email"), you will get the email from the answer body right away.

GPath uses Groovy syntax. It helps you work with JSON and XML files. You can read arrays with it. You can use GPath to get objects that are inside other things. GPath lets you set rules for your data. This helps you find and choose the information you need.

If you know these ways to get data, you can make strong checks. You can also connect API calls. This is good to see how people use more than one endpoint. You can check how everything works from start to finish.

13. How do you handle cookies and headers in Rest Assured?

Rest assured lets you add cookies and HTTP headers very fast. You can use .cookie("name", "value") to add a cookie. If you need to add a header, just use .header("Header-Name", "HeaderValue"). With rest assured, you can look like you are signed in, or you can change the way you ask for or get the data you need.

When you read the reply, you can use response.getCookie("name") to find the cookie. You can also use response.getHeader("Header-Name") to read the header. This helps you to see if the session is still open. You may check if the security options are set on the server. Make sure the server gives you what you need.

Watching cookies and headers is important in api testing. You need to do this to see what happens when people use the app. This way, your api testing gets close to what the real user will go through. It helps you know how things work and makes your tests better.

14. What is the role of RequestSpecification and ResponseSpecification?

RequestSpecification and ResponseSpecification can help you when you write tests with rest assured. With these, you can set base uri, headers, and authentication one time. You don’t need to type these details again in each test. This stops code duplication. Your code can stay neat and easy to read. When your tests use the same setup, they always match. This also saves time and makes your tests look good and clear for people.

For example:

RequestSpecification reqSpec = new RequestSpecBuilder()
    .setBaseUri("https://api.example.com")
    .addHeader("Content-Type", "application/json")
    .build();

With ResponseSpecification, you can keep all the things you expect in one spot. You can put the status codes and content types together. This lets you check each test the same way every time. So, it helps you to find problems fast.

If you stick to these rules, you can update your tests without much effort. When the API changes, it will be easy to change the tests. This way, you will keep everything up to date and things will run smooth for you.

15. How do you log requests and responses for debugging?

It is easy to fix problems if a test is not working right when you see all the facts from both the request and the answer. When you use rest assured, you can keep track of everything with the .log().all() method. You can use this before you send out the request, or after you get the answer back.

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

This tool lets you find problems with headers, payloads, and strange replies from the server. You can switch logging on when you need to. The results will show logging only if a test does not pass. This helps keep your test results simple to read day by day. But, you still get more details to help solve issues if they show up.

Having detailed logs helps a lot in test automation. The logs let you find problems fast. You can see what is not working. You can fix it in less time. This helps everyone solve issues quickly. The team can work better together.

Advanced Rest Assured Interview Questions & Strategies

When you have interview questions for a Rest Assured interview, it is not good to know just a few basic things. You need to talk about how authentication works in Rest Assured. The person talking to you will also want you to show that you know how to use files in your work. Try to show how you use testing frameworks in your tasks. A lot of people in charge of hiring want to see someone who does more than just test APIs. They look for people who solve tough problems and help with continuous integration.

When you learn about things like OAuth 2.0, multipart uploads, custom filters, and where to run your tests, you start to feel ready for hard questions. These are good things to know for api testing. You will see how you use them in your daily job. This can help you feel better and be more sure when you do api testing at work.

16. How do you implement OAuth 2.0 and other advanced authentication methods?

Handling advanced authentication with Rest Assured is important for API requests. You need to know about OAuth 2.0 for this. First, you ask the authentication server for an access token. Use your own details to get this token. When you have the token, you include it in your API requests. You do this by calling .auth().oauth2("accessToken"). Rest Assured uses this way so you can send API requests that need authentication.

For APIs that use Bearer or Digest authentication, rest assured is simple to use. You only need to add methods like .auth().digest() or .header("Authorization", "Bearer token") in your code. When you do this, you follow best practices, and you can work with many APIs. With rest assured, you can use security tips and connect fast without any problems.

When you use these top ways, you feel sure when you check secure endpoints. Your tests feel real. They work like how people ask for and get permission in the real world. The tests match what happens outside in people’s day to day lives.

17. How do you handle multipart file uploads and downloads with Rest Assured?

Uploading many files at the same time with Rest Assured can help make the process quicker. This is good when people need to put several files into an app. To do this, you can use the .multiPart() method in Rest Assured.

File file = new File("path/to/file.txt");
given()
    .multiPart("file", file)
    .when()
    .post("/upload")
    .then()
    .statusCode(200);

To get files, you need to use a get request. This will give you the data you need. If you use response.asByteArray(), it will give you the file as bytes. You can use these bytes to write the file to your disk.

Testing file transfers with Rest Assured is a good way to see if your APIs work with big files. You can use it to check if your API handles binary data. This is important for the way many businesses do their work.

18. What are Filters in Rest Assured and how can they be used for custom functionality?

Filters in rest assured act as middle helpers. They help you see and change requests and responses. You get to watch everything that happens with each request. Rest assured offers readymade filters that work on almost all actions. And, you can create your own filters in it if you want. Filters are good for adding headers. You can use them to do retries when needed.

A custom filter might look like this:

public class MyFilter implements Filter {
    public Response filter(FilterableRequestSpecification requestSpec, FilterableResponseSpecification responseSpec, FilterContext ctx) {
        // Custom logic here
        return ctx.next(requestSpec, responseSpec);
    }
}

Using filters in your tests can make it easier to spot where things go wrong. It helps you keep the logging format the same, no matter how many times you run the test. You can also choose your own way to handle authentication. This makes your automation steps simple to update, and it helps them stay strong.

19. How do you integrate Rest Assured tests with TestNG or JUnit frameworks?

You can use rest assured with testing frameworks like TestNG or JUnit. This helps with test execution and reporting. In TestNG, you have to use the @Test tag for your test methods. Put your rest assured code inside these methods.

@Test
public void testGetUser() {
    given()
    .when()
    .get("/users/1")
    .then()
    .statusCode(200);
}

JUnit uses the @Test tag to run tests. You will see that some other tools use it as well. Both can help put tests into groups or give them different values. The way these work makes test automation easier for big projects with APIs.

This way, you can run api tests with your unit tests or integration tests. It helps your continuous integration stay easy. Things keep working well for you too.

20. How can you perform data-driven testing using Rest Assured?

Data-driven testing helps you check more parts of your API. It runs one test many times. Each time, it uses new data in that test. If you use rest assured, you can connect your tests with TestNG’s @DataProvider. You can use JUnit’s test with different data for this, too.

@DataProvider(name = "userData")
public Object[][] createUserData() {
    return new Object[][] { {"user1", "pass1"}, {"user2", "pass2"} };
}

@Test(dataProvider = "userData")
public void testLogin(String username, String password) {
    given()
        .param("username", username)
        .param("password", password)
        .when()
        .post("/login")
        .then()
        .statusCode(200);
}

The testing group uses this way to check the API endpoints for many things. It helps them be quick when they need to make changes. This also makes the group strong. When people work like this, they can find problems fast. So, this helps everything work right for all people.

21. What strategies help you test microservices and handle dynamic responses?

Testing microservices can feel too hard sometimes. You have to look after so many services and so many endpoints. The data you work with can also change. A good way to help with this is to use environment configuration files. These files let you keep each endpoint and the URLs for every service in one place. When you do this, your tests work well no matter where you use them.

You can use JSONPath or Hamcrest matchers for answers that might be different each time. These tools let you get the same details, even when they move around or change. You can use them to find or check certain things in your answers. This helps you see what is always the same, no matter where it is. Here’s an example:

given().get("/users")
    .then().body("users", hasItem("John Doe"));

These ways make sure the tests stay good, even when the data in the restful api changes. The tips use best practices, and are good for restful api architecture. This style goes well with a modern restful api and microservices.

22. How do you manage environment configuration for different stages (dev, prod, etc.)?

Managing environment settings means you work with environment variables, config files, and cd pipelines. You use these tools to set up everything you need for development, testing, and production. By keeping all your files in version control, you make sure they are the same every time. You can still change the settings for each step. This helps stop things from breaking as you move from one stage to the next. A good tip is to check your settings often. This makes sure what you set up works for your deployment needs.

23. What are the latest updates and trends in Rest Assured interview questions for 2025?

Rest Assured interview questions in 2025 focus on strong api testing skills. People ask if you use rest assured to test apis for microservices. They want to know if you connect rest assured with cd pipelines when you test. A lot of the interview questions see if you check the full contract, from start to finish. Now, people ask about how you handle changing data during api testing. They look to see if you run tests at the same time and deal with errors the right way. You need to be good at solving problems when you do api testing in a rest assured interview.

Today, people need to test hard JSON and XML files more often. A lot of companies now want the staff who can use GraphQL APIs. Bosses will ask workers to practice with special filters and to set rules that everyone at work can use. This helps a lot to keep track of the settings in the office.

Staying up-to-date with these trends can help you be ready for new changes in API automation. This shows that you know what is coming, so when you go to an interview, you look ahead in the field.

Conclusion

To sum it up, learning Rest Assured can help you feel ready for automation jobs. You will feel more sure when you go for interviews. If you practice both basic and advanced interview questions about api testing, you will feel much better about what you know. Go over the interview questions to get the main ideas. This will help you give good answers.

It is good to stay up-to-date with new changes in Rest Assured. When you know the latest things, it can help you feel ready for job interviews. If you want to get better at answering interview questions, you can talk with our experts for free. They will help you get more knowledge about API testing and Rest Assured.

Frequently Asked Questions

What are the most commonly asked Rest Assured interview questions for automation roles?

People often get asked about interview questions on Rest Assured. You may have to show how to set up Rest Assured for a Java project. A lot of the questions can be about how to handle authentication. Many times, you will talk about status codes and how to use them in your test scripts.

Some interviews want to know how you read API responses. There may also be questions about request specifications. The interviewer might ask you how to write test scripts so they are easy read and for anyone to keep working on over time. A lot of hiring managers want to see if you can spot real problems with automation. They also look for people who know how to fix issues when they come up in their work.

What are the key features and advantages of using Rest Assured for API testing?

Rest Assured is a tool you use with Java. It helps you write code that is easy for people to read. You can use any http methods when you use Rest Assured. The tool lets you sign in to your API in many ways. When you want to do api testing, Rest Assured lets you work with many types of content. A helpful thing is you can get it ready fast. It uses method chaining, so your code will be simple and people can follow it. Rest Assured gives you good tools to check status codes, headers, and response bodies. This helps you test your API, feel good about how it works, and know you got good results.

How should I prepare for advanced Rest Assured interview questions?

To get ready for rest assured interview questions, you have to first know what Rest Assured can do. Try working on some test cases that are not easy. It is also good to know a lot about RESTful services. You can practice a few ways for performance testing as well. Use mock APIs in your practice, because these feel close to what you get in real work. Read about best practices for Rest Assured so you can keep up with new changes. This will help you feel sure when you answer rest assured interview questions.