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of 21What is API Testing and why is it important?
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API Testing validates Application Programming Interfaces directly at the message layer, verifying functionality, reliability, performance, and security without a user interface.
Key Benefits:
- Early Detection: Identifies issues before UI development
- Faster Execution: Quicker than UI-based tests
- Direct Logic Testing: Tests business logic without UI dependencies
- Integration Validation: Ensures proper system communication
- Cost-Effective: Earlier bug detection reduces fix costs
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What are the different types of APIs?
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REST APIs: HTTP-based, stateless architecture
- Most common type using JSON/XML
- Follows REST architectural principles
- Simple and widely supported
SOAP APIs: XML-based protocol with formal structure
- Built-in error handling and security (WS-Security)
- More rigid but enterprise-friendly
- Contract-first approach with WSDL
GraphQL APIs: Query language with single endpoint
- Client specifies exact data requirements
- Strongly typed schema
- Reduces over-fetching and under-fetching
WebSocket APIs: Real-time bidirectional communication
- Persistent connections for live updates
- Ideal for chat, gaming, or streaming applications
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What are the key components to test in an API?
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Request Components:
- Headers, parameters, and body format validation
- Input data types and constraints
Response Validation:
- HTTP status codes and response headers
- Response body structure and content accuracy
Functional Testing:
- Business logic correctness
- Data transformation and processing
Non-Functional Testing:
- Performance (response times, throughput)
- Security (authentication, authorization)
- Error handling and edge cases
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Explain the different HTTP methods used in REST APIs
What are the most important HTTP status codes for API testing?
What is the difference between Functional and Non-Functional API Testing?
Compare popular API testing tools
What is data validation testing in APIs?
How do you test API authentication mechanisms?
What is idempotency and how do you test it?
What is Contract Testing and why is it important?
How do you implement API mocking for testing?
How do you test API rate limiting?
What performance metrics should you measure in API testing?
How do you test API error handling?
How do you test API response schemas?
What is API versioning and how do you test it?
How do you handle test data management for API testing?
How do you test microservices APIs?
What are common API testing anti-patterns to avoid?
How do you measure API testing effectiveness?
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