API Testing Framework Interview Questions

Introduction – Why API Testing Framework Knowledge Matters in Interviews

In modern QA and SDET interviews, knowing how to test APIs is no longer enough. Interviewers increasingly focus on API testing frameworks—how they are designed, structured, maintained, and scaled. That’s why api testing framework interview questions are common in both manual-to-automation transitions and experienced automation roles. 

Interviewers want to see whether you can: 

What Interviewers Evaluate 

• Design a reusable and scalable API automation framework 

• Separate test logic from test data 

• Handle authentication, assertions, and reporting 

• Integrate API tests with CI/CD pipelines 

Why API Testing Framework Knowledge Matters 

A good API automation framework helps teams create maintainable, reusable, and scalable test suites. Organizations look for candidates who understand not only how to automate APIs but also how to build frameworks that support long-term project growth and continuous testing. 

Framework-related questions are especially common for: 

• QA Automation Engineers 

• API Automation Testers 

• SDETs (Software Development Engineers in Test) 

• Automation Leads 

• Senior QA Engineers 

What Is API Testing? (Clear & Simple) 

API testing is a type of software testing that validates the functionality, reliability, performance, and security of APIs (Application Programming Interfaces) by sending requests and verifying responses. 

Instead of testing the graphical user interface (UI), API testing focuses on backend communication between systems. APIs act as intermediaries that allow different software applications to exchange data and communicate with each other. 

API testing verifies whether APIs: 

• Return correct responses  

• Process requests accurately  

• Handle errors properly  

• Maintain security standards  

• Perform efficiently under load conditions  

Why API Testing Is Important 

Modern applications depend heavily on APIs for communication between: 

• Web applications  

• Mobile applications  

• Databases  

• Third-party services  

• Cloud platforms  

If APIs fail, important business operations may stop functioning properly. 

Areas Validated in API Testing 

Functional Validation 

Checks whether APIs work according to business requirements. 

Data Validation 

Ensures API responses contain accurate data. 

Error Handling 

Validates how APIs behave under invalid conditions. 

Security Validation 

Checks authentication and authorization mechanisms. 

Performance Validation 

Measures response time and scalability. 

Example 

Sending a GET request to: 

/users/1 

and validating whether the correct user details are returned in the response. 

Real-Time Scenario 

In a banking application, API testing verifies whether account balance APIs return accurate balance information after successful authentication. 

REST vs SOAP vs GraphQL 

Feature	REST	SOAP	GraphQL
Type	Architectural style	Protocol	Query language
Data format	JSON	XML	JSON
Performance	Fast & lightweight	Slower	Optimized
Flexibility	High	Low	Very high
Usage	Most modern apps	Legacy/enterprise apps	Modern frontend apps

90+ API Testing Framework Interview Questions & Answers 

API Testing Framework Basics (Freshers) 

1. What is an API testing framework? 

An API testing framework is a structured collection of tools, libraries, utilities, standards, and reusable components designed to automate API testing efficiently. It provides a consistent approach for creating, executing, and maintaining API test cases across projects. 

A well-designed framework typically includes request handling, test data management, authentication utilities, assertions, reporting mechanisms, logging, and CI/CD integration. Instead of writing repetitive code for every API test, testers can leverage reusable framework components, making automation faster and easier to maintain. 

The primary goal of an API testing framework is to improve test quality, scalability, maintainability, and execution efficiency. 

2. Why do we need an API testing framework? 

API testing frameworks are essential because they reduce code duplication and provide a standardized way of developing and executing API tests. 

Benefits include: 

• Improved code reusability 

• Easier maintenance 

• Better scalability 

• Faster test execution 

• Consistent coding standards 

• Centralized reporting and logging 

• Simplified environment management 

• Seamless CI/CD integration 

Without a framework, automation projects often become difficult to maintain as the number of APIs and test cases grows. 

3. What are the core components of an API framework? 

A robust API testing framework typically contains several key components that work together to automate testing efficiently. 

Core components include: 

• Request handling layer 

• Response validation and assertions 

• Test data management 

• Configuration management 

• Authentication utilities 

• Logging mechanisms 

• Reporting utilities 

• Environment management 

• CI/CD integration support 

Each component serves a specific purpose and helps keep the framework modular and maintainable. 

4. Which APIs are easiest to automate in frameworks? 

REST APIs are generally the easiest APIs to automate because they use standard HTTP methods and commonly exchange data in JSON format. 

Advantages of REST APIs include: 

• Simple request structure 

• Lightweight JSON payloads 

• Easy integration with automation tools 

• Better readability 

• Faster execution 

Most modern automation frameworks are primarily designed around REST API testing. 

5. What protocols are commonly used? 

The most commonly used protocols in API automation frameworks are HTTP and HTTPS. 

HTTP is used for communication between clients and servers, while HTTPS provides encrypted communication through SSL/TLS security. 

Frameworks must be capable of handling: 

• HTTP requests 

• HTTPS requests 

• SSL certificates 

• Secure authentication mechanisms 

Most production APIs today operate over HTTPS for security reasons. 

6. What is an endpoint? 

An endpoint is a unique URL where an API receives requests and sends responses. 

Example: 

GET https://api.company.com/users/101 

In this example: 

• Base URL = https://api.company.com 

• Endpoint = /users/101 

Frameworks often centralize endpoint management to simplify maintenance and avoid hardcoded URLs throughout test scripts. 

7. What is a request payload? 

A request payload is the data sent from a client to a server, usually in POST, PUT, or PATCH requests. 

Example: 

{ 
“name”: “Srushti”, 
“email”: “srushti@test.com”
} 

Frameworks often generate payloads dynamically using: 

• JSON files 

• POJO classes 

• Data providers 

• Utility methods 

This improves test data management and reusability. 

8. What is a response payload? 

A response payload is the data returned by the server after processing an API request. 

Example: 

{ 
“id”: 101, 
“name”: “Srushti”, 
“status”: “ACTIVE” 
} 

Frameworks validate response payloads using assertions to verify: 

• Correct data values 

• Data types 

• Business rules 

• Schema structure 

Response validation is one of the most critical aspects of API automation. 

9. What is statelessness in REST? 

Statelessness is a core REST principle where each request contains all information required for processing. 

The server does not maintain session information between requests. 

Benefits include: 

• Better scalability 

• Easier maintenance 

• Improved performance 

• Reduced server complexity 

For example, authentication tokens must be included in every request rather than relying on server-side sessions. 

10. What is idempotency? 

Idempotency means that executing the same request multiple times produces the same outcome. 

Example: 

PUT /users/101 

Whether the request is executed once or multiple times, the resource remains in the same state. 

Common idempotent methods include: 

• GET 

• PUT 

• DELETE 

POST is generally not idempotent because repeated requests may create duplicate resources. 

REST API Framework Interview Questions 

11. Which HTTP methods are commonly used? 

The most frequently used HTTP methods are: 

• GET – Retrieve data 

• POST – Create data 

• PUT – Replace data 

• PATCH – Partially update data 

• DELETE – Remove data 

Frameworks typically provide reusable methods for handling these operations. 

12. Difference between GET and POST? 

GET is used to retrieve information from a server. 

Example: 

GET /users/101 

POST is used to create new resources. 

Example: 

POST /users 

Key differences: 

• GET retrieves data 

• POST creates data 

• GET usually has no request body 

• POST contains a payload 

• GET is generally cacheable 

• POST is typically not cached 

13. Difference between PUT and PATCH? 

PUT replaces an entire resource. 

Example: 

{ 
“name”: “Srushti”, 
“role”: “QA Engineer” 
} 

PATCH updates only selected fields. 

Example: 

{ 
“role”: “Senior QA Engineer” 
} 

PUT is used for complete replacement, whereas PATCH is used for partial modifications. 

14. What is JSON? 

JSON (JavaScript Object Notation) is a lightweight data-interchange format widely used in REST APIs. 

Example: 

{ 
“id”: 101, 
“name”: “Srushti”, 
“role”: “QA Engineer” 
} 

Advantages include: 

• Easy readability 

• Lightweight structure 

• Fast parsing 

• Language independence 

Most REST API frameworks work extensively with JSON payloads. 

15. What are headers in API frameworks? 

Headers are metadata that provide additional information about API requests and responses. 

Examples: 

Content-Type: application/json 
Authorization: Bearer token 
Accept: application/json 

Frameworks often manage headers centrally to ensure consistency across all API requests. 

16. What is Content-Type? 

Content-Type is an HTTP header that specifies the format of data being sent or received. 

Examples: 

Content-Type: application/json 
Content-Type: application/xml 

This helps servers understand how to process request payloads correctly. 

17. What is a query parameter? 

A query parameter is appended after the question mark (?) in a URL and is used to filter or customize results. 

Example: 

GET /users?page=2&status=active 

Frameworks often generate query parameters dynamically for data-driven testing. 

18. What is a path parameter? 

A path parameter is a dynamic value embedded within the endpoint URL. 

Example: 

GET /users/101 

Here, 101 is a path parameter representing a specific user. 

Frameworks commonly parameterize path values to improve reusability. 

19. What is pagination? 

Pagination is a technique used to divide large datasets into smaller pages. 

Example: 

GET /users?page=1&size=20 

Benefits include: 

• Faster responses 

• Reduced server load 

• Better performance 

• Improved user experience 

Frameworks should validate page sizes, page counts, and navigation behavior. 

20. What is API versioning? 

API versioning is a strategy used to manage API changes while maintaining backward compatibility. 

Examples: 

/api/v1/users 
/api/v2/users 

Versioning helps organizations introduce new features without breaking existing client applications. 

API Testing Framework Design Questions 

21. What design pattern is commonly used in API frameworks? 

Most API automation frameworks follow a layered or service-based architecture. 

Common layers include: 

• Test Layer 

• Service Layer 

• Utility Layer 

• Configuration Layer 

• Reporting Layer 

Benefits include: 

• Better maintainability 

• Easier scalability 

• Code reusability 

• Clear separation of responsibilities 

This is one of the most frequently asked framework-design interview questions. 

22. How do you separate test logic and test data? 

Test data should be stored outside the test scripts. 

Common approaches include: 

• JSON files 

• Excel files 

• CSV files 

• YAML files 

• Databases 

Benefits: 

• Easier maintenance 

• Data-driven testing 

• Reduced code duplication 

• Improved flexibility 

This separation is considered a framework best practice. 

23. How do you handle configuration in frameworks? 

Configuration is typically managed using centralized configuration files. 

Examples: 

• config.properties 

• application.properties 

• YAML files 

Configuration files may store: 

• Base URLs 

• Credentials 

• Environment details 

• Timeouts 

• API keys 

This eliminates hardcoded values from automation scripts. 

24. How do you manage environments (QA, Staging, Prod)? 

Most frameworks maintain separate environment-specific configuration files. 

Example: 

qa.properties 
staging.properties 
prod.properties 

During execution, the framework loads the appropriate configuration based on the selected environment. 

Benefits include: 

• Easier deployment 

• Environment flexibility 

• Reduced maintenance effort 

25. How do you handle authentication in frameworks? 

Authentication should be centralized in reusable utility components. 

Typical approach: 

1. Generate token. 

2. Store token. 

3. Reuse token in API requests. 

4. Refresh token when required. 

Benefits include: 

• Reduced duplication 

• Easier maintenance 

• Better security management 

Authentication utilities are a critical framework component. 

26. How do you reuse API methods? 

Reusable service classes are commonly used to avoid code duplication. 

Example: 

UserService.createUser(); 
UserService.getUser(); 
UserService.deleteUser(); 

Benefits include: 

• Cleaner test scripts 

• Better maintainability 

• Easier updates 

• Consistent implementation 

Service classes form the backbone of most scalable API frameworks. 

27. How do you implement assertions? 

Assertions are typically centralized in utility classes. 

Examples: 

• Status code validation 

• Response body validation 

• Schema validation 

• Header validation 

Benefits: 

• Reusable validations 

• Consistent reporting 

• Easier maintenance 

Centralized assertion frameworks improve overall framework quality. 

28. How do you log API requests and responses? 

Logging is implemented using logging libraries or framework hooks. 

Common tools include: 

• Log4j 

• SLF4J 

• Java Util Logging 

Typical logging information includes: 

• Request URL 

• Request method 

• Request headers 

• Request payload 

• Response headers 

• Response payload 

• Response time 

Detailed logs help teams troubleshoot failures quickly and improve debugging efficiency. 

API Automation Tools Interview Questions  

29. Which tools are used to build API testing frameworks? 

Several tools and libraries are commonly used to build API testing frameworks, depending on the project requirements and programming language being used. 

Popular API automation tools include: 

• Postman 

• SoapUI 

• Rest Assured 

• Karate Framework 

• Python Requests 

• JMeter 

• ReadyAPI 

Each tool serves different purposes. For example, Postman is commonly used for API exploration and quick automation, while Rest Assured and Karate are preferred for scalable automation frameworks. Organizations often combine multiple tools within a single testing ecosystem. 

30. What is Postman used for in frameworks? 

Postman is widely used for API development, testing, and validation. Although it started as a manual testing tool, it now supports automation through collections, scripts, and CI/CD integration. 

Postman is commonly used for: 

• Manual API validation 

• Creating reusable collections 

• Writing automated test scripts 

• Managing environments 

• API documentation 

• Data-driven testing 

• Newman-based command-line execution 

Framework teams often use Postman during the early stages of API validation before migrating automation to frameworks such as Rest Assured or Karate. 

31. What is SoapUI used for? 

SoapUI is a powerful API testing tool primarily used for testing SOAP and REST services. 

Its major capabilities include: 

• Functional testing 

• Regression testing 

• Security testing 

• Data-driven testing 

• Load testing 

• Mock services 

• XML validation 

SoapUI is especially popular in enterprise environments where SOAP web services are heavily used. 

32. What is Rest Assured? 

Rest Assured is an open-source Java library specifically designed for REST API automation testing. 

It simplifies API testing by providing a fluent and readable syntax for: 

• Sending HTTP requests 

• Validating responses 

• Extracting data 

• Performing authentication 

• Schema validation 

Example: 

given() 
.when() 
.get(“/users/101”) 
.then() 
.statusCode(200); 

Rest Assured is one of the most commonly used tools in Java-based API automation frameworks. 

33. Which language is Rest Assured based on? 

Rest Assured is built on Java and is designed specifically for Java developers and automation testers. 

Because it uses Java, testers often combine it with: 

• TestNG 

• JUnit 

• Maven 

• Gradle 

• Log4j 

• Allure Reports 

Knowledge of Core Java is usually required to build scalable Rest Assured frameworks. 

34. What is Karate Framework? 

Karate is a Behavior-Driven Development (BDD) style API automation framework that allows testers to write API tests using simple, human-readable syntax. 

Key features include: 

• Minimal coding 

• Built-in assertions 

• API testing support 

• Performance testing support 

• Mock service capabilities 

• CI/CD integration 

Example: 

Feature: User API Testing 
 
Scenario: Get User Details 
Given url ‘https://api.company.com/users/101‘ 
When method GET 
Then status 200 

Karate is popular among teams looking for low-code API automation solutions. 

35. Can API frameworks run without UI tests? 

Yes. API automation frameworks are completely independent of UI automation frameworks. 

Benefits of API-only automation include: 

• Faster execution 

• Earlier defect detection 

• Greater stability 

• Reduced maintenance 

• Better test coverage 

Many organizations execute API automation long before the UI is available because business logic typically resides at the API layer. 

SOAP & XML Framework Questions 

36. Can SOAP APIs be automated in frameworks? 

Yes. SOAP APIs can be fully automated using tools such as SoapUI, Rest Assured, and custom Java frameworks. 

SOAP automation typically involves: 

• Sending XML requests 

• Validating XML responses 

• XPath assertions 

• Schema validation 

• Security testing 

SOAP APIs are still widely used in banking, insurance, healthcare, and enterprise systems. 

37. What is WSDL? 

WSDL (Web Services Description Language) is an XML document that describes the structure and capabilities of a SOAP web service. 

A WSDL file contains: 

• Available operations 

• Request formats 

• Response formats 

• Service endpoints 

• Protocol definitions 

• Data types 

Automation tools can use WSDL files to automatically generate SOAP requests, making testing faster and more reliable. 

38. How do you validate XML responses? 

XML responses can be validated using XPath expressions, schema validations, and XML assertions. 

Example Response: 

<response> 
<status>SUCCESS</status> 
</response> 

Example XPath: 

//response/status=’SUCCESS’ 

Common XML validations include: 

• Element existence 

• Element values 

• Attribute values 

• XML structure 

• Schema validation 

• Business rule validation 

Frameworks often provide reusable XML validation utilities. 

HTTP Status Codes – Must Know 

39. What are HTTP status codes? 

HTTP status codes indicate the outcome of an API request and are one of the most important concepts in API testing. 

Common status codes include: 

Status Code	Meaning
200	OK
201	Created
204	No Content
400	Bad Request
401	Unauthorized
403	Forbidden
404	Not Found
409	Conflict
500	Internal Server Error

Interviewers frequently ask about these codes because they form the foundation of API validation. 

40. Why is validating status codes important? 

Status code validation helps verify whether the API processed a request successfully or encountered an error. 

Benefits include: 

• Fast error detection 

• Verification of expected behavior 

• Better defect identification 

• Improved test reliability 

However, status code validation alone is not sufficient. Response body validation must also be performed. 

Real-Time API Validation Example 

41. How would you validate a User Creation API? 

Request: 

POST /api/users 

Payload: 

{ 
“email”: “test@example.com“, 
“password”: “Test@123” 
} 

Response: 

{ 
“id”: 501, 
“message”: “User created successfully” 
} 

Validation checklist: 

• Status code should be 201. 

• User ID should not be null. 

• Success message should match expected value. 

• Response schema should be valid. 

• Response time should be acceptable. 

• User should be created successfully in the backend system. 

This is a common real-world interview scenario. 

Automation Code Snippets (Framework Style) 

42. How do you validate API responses in Postman? 

Example: 

pm.response.to.have.status(201); 
 
pm.expect(pm.response.json().id).to.exist; 

Additional validations may include: 

• Header validation 

• Response time validation 

• Schema validation 

• Data integrity checks 

Postman scripts are commonly executed through Newman in CI/CD pipelines. 

43. How do you validate API responses using Rest Assured? 

Example: 

given() 
.when() 
.post(“/api/users”) 
.then() 
.statusCode(201); 

Additional validation: 

.then() 
.body(“message”, equalTo(“User created successfully”)); 

Rest Assured supports both simple and advanced response validations. 

44. How do you automate APIs using Python? 

Python provides the Requests library for lightweight API automation. 

Example: 

import requests 
 
response = requests.post(url, json=payload) 
 
assert response.status_code == 201 

Advantages include: 

• Simple syntax 

• Fast development 

• Easy JSON handling 

• Excellent integration options 

Python is increasingly popular for API testing and automation. 

Scenario-Based API Testing Framework Interview Questions 

45. API returns 200 but wrong data. What do you do? 

A successful status code does not guarantee correct business behavior. 

Actions: 

• Validate response fields 

• Compare expected and actual values 

• Verify business rules 

• Check backend data if required 

• Raise a defect with supporting evidence 

Business-level assertions should always accompany status code validations. 

46. How do you handle dynamic tokens in frameworks? 

Most frameworks use centralized authentication utilities. 

Typical process: 

1. Generate token through login API. 

2. Extract token from response. 

3. Store token centrally. 

4. Reuse token in subsequent requests. 

Benefits include: 

• Better maintainability 

• Reduced code duplication 

• Easier token refresh management 

47. How do you test dependent APIs in frameworks? 

Dependent APIs are tested through API chaining. 

Example workflow: 

1. Create User API 

2. Extract User ID 

3. Retrieve User Details 

4. Update User 

5. Delete User 

This simulates real-world business processes and validates end-to-end functionality. 

48. How do you automate negative scenarios? 

Negative testing validates system behavior under invalid conditions. 

Examples: 

• Invalid payloads 

• Missing fields 

• Invalid tokens 

• Incorrect data types 

• Invalid query parameters 

Frameworks typically use data-driven approaches to execute multiple negative scenarios efficiently. 

49. How do you validate response schemas? 

Response schema validation ensures that the API response structure matches predefined expectations. 

Common approaches: 

• JSON Schema Validation 

• XML Schema Validation (XSD) 

• Contract Validation 

Benefits include: 

• Early detection of API contract changes 

• Better consistency 

• Improved reliability 

Schema validation is frequently used in mature automation frameworks. 

50. How do you test rate limiting? 

Rate limiting tests verify how APIs behave when request limits are exceeded. 

Typical approach: 

• Send multiple requests rapidly. 

• Exceed configured threshold. 

• Verify API returns: 

429 Too Many Requests 

Additional validations may include retry headers and cooldown periods. 

51. How do you validate API performance in frameworks? 

Basic performance validation is usually implemented through response-time assertions. 

Examples: 

• Response time < 2 seconds 

• No timeout errors 

• Consistent execution speed 

Performance assertions help identify slow APIs early in the development cycle. 

52. How do you handle flaky API tests? 

Flaky tests produce inconsistent results despite no application changes. 

Common solutions include: 

• Improving assertions 

• Eliminating hardcoded waits 

• Stabilizing test data 

• Handling asynchronous processing correctly 

• Adding retries when appropriate 

Reducing flaky tests improves framework reliability and confidence. 

53. How do you integrate API frameworks with CI/CD? 

API frameworks are commonly integrated with CI/CD pipelines using: 

• Jenkins 

• GitHub Actions 

• GitLab CI/CD 

• Azure DevOps 

• Bamboo 

Execution typically occurs through: 

mvn test 

or 

gradle test 

Benefits include: 

• Continuous testing 

• Faster feedback 

• Automated quality checks 

• Reduced manual effort 

54. How do you debug failing API tests? 

Effective debugging requires detailed logs. 

Important information includes: 

• Request URL 

• Request headers 

• Request payload 

• Response headers 

• Response body 

• Response time 

• Stack traces 

Comprehensive logging significantly reduces troubleshooting time. 

How Interviewers Evaluate Your Answers 

What do interviewers look for in API framework interviews? 

Interviewers typically evaluate: 

• Understanding of API fundamentals 

• Framework architecture knowledge 

• Reusability concepts 

• Configuration management 

• Authentication handling 

• Assertion strategies 

• CI/CD integration knowledge 

• Real-world problem-solving ability 

• Debugging techniques 

Strong candidates explain concepts using practical project examples rather than theoretical definitions. 

API Testing Framework Cheat Sheet (Quick Revision) 

What should you revise before an API framework interview? 

Quick revision checklist: 

• Reusable service classes 

• Centralized configuration management 

• Environment handling 

• Data-driven testing 

• Authentication utilities 

• JSON and XML validation 

• Strong assertion strategies 

• Request and response logging 

• Schema validation 

• API chaining 

• Token management 

• CI/CD integration 

• Reporting frameworks 

• Framework architecture principles 

These topics cover most API Testing Framework interview questions asked in QA Automation, API Automation, and SDET interviews. 

FAQs – API Testing Framework Interview Questions 

Q1. Are API testing frameworks mandatory for automation roles? 
Yes, for most automation testing and SDET roles today, API testing framework knowledge is either mandatory or highly preferred. 

Knowing how to send API requests in Postman is useful, but interviewers often want to know whether you can build, maintain, and scale an API automation framework. 

Why Interviewers Ask Framework Questions 

Companies are looking for testers who can: 

• Create reusable automation solutions  

• Reduce code duplication  

• Maintain large test suites  

• Integrate tests with CI/CD pipelines  

• Support multiple environments  

• Handle authentication and reporting efficiently  

This is why framework-related questions are very common in automation interviews. 

Q2. Is Rest Assured enough to build a framework? 
Yes, Rest Assured is enough to build a complete API automation framework, and in fact, many companies use Rest Assured as the core library for their API testing frameworks. 

However, Rest Assured alone is not the framework—it is the API automation library around which the framework is built. 

What Rest Assured Provides 

Rest Assured helps you: 

• Send API requests  

• Validate responses  

• Handle authentication  

• Extract response data  

• Perform API chaining  

• Validate JSON and XML  

• Execute assertions  

Example: 

given() 
.header(“Authorization”, token) 
.when() 
.get(“/users/101”) 
.then() 
.statusCode(200); 

This handles API interactions, but a framework requires additional components. 

Q3. Can freshers learn API frameworks easily? 
Yes, freshers can learn API frameworks relatively easily, especially if they already understand basic API testing concepts such as REST APIs, HTTP methods, JSON, and Postman. 

In fact, API frameworks are often easier to learn than complex UI automation frameworks because they focus on backend communication and usually involve fewer UI-related challenges such as locators, synchronization issues, and browser compatibility. 

Q4. Are REST APIs more common than SOAP in frameworks? 
Yes, REST APIs are far more common than SOAP APIs in modern API automation frameworks. 

Today, most QA Automation, API Automation, and SDET projects primarily focus on REST API testing because modern web applications, mobile apps, microservices, and cloud-based systems predominantly use REST services. 

Why REST APIs Are More Popular 

1. Simpler Architecture 

REST APIs use standard HTTP methods: 

• GET  

• POST  

• PUT  

• PATCH  

• DELETE  

Example: 

GET /api/users/101 

This simplicity makes REST APIs easier to develop, test, and automate. 

2. JSON-Based Communication 

REST APIs commonly use JSON: 

{ 
“id”: 101, 
“name”: “Srushti”, 
“role”: “QA Engineer” 
} 

Benefits of JSON: 

• Lightweight  

• Human-readable  

• Easy to parse  

• Faster than XML in many cases  

This makes automation frameworks simpler and more maintainable. 

3. Microservices Adoption 

Most modern applications are built using microservices architecture. 

Popular platforms such as: 

• Netflix  

• Amazon  

• Uber  

• Spotify  

heavily use REST APIs and microservices-based communication. 

As a result, API automation frameworks are usually designed around REST services.