Top 15 API Testing Interview Questions and Answers

In the swiftly evolving landscape of software development, Application Programming Interfaces (APIs) have become indispensable components, facilitating seamless communication and interaction among diverse software systems. Employers now place increased value on individuals holding recognized quality assurance certification, highlighting the importance of participating in structured QA tester training programs.

This discussion will explore the top 15 API testing interview questions, furnishing comprehensive answers to empower aspiring candidates with valuable insights for cracking their API testing interviews in 2024.

Understanding APIs:

API (Application Programming Interface): A collection of functions and procedures defining communication between software components. API testing involves scrutinizing these functions.

TestApi: A library of utility and test APIs aiding developers and testers in building automated tests and tools for .NET and Win32 applications, offering standard test types, building blocks, data structures, and algorithms.

RESTful API: An architectural paradigm focusing on interoperability, scalability, and simplicity in networked application architecture.

SOAP API: Utilizes XML for structured data exchange in web service implementations, providing guidelines for message exchange, error handling, and security.

Explaining API Documentation:

API documentation is an exhaustive manual detailing how to use and communicate with an API. It covers request and response forms, authentication and authorization techniques, error handling, API endpoints, and other relevant features.

Common Protocols in API Testing:

HTTP, JMS, REST, SOAP, UDDI.

HTTP Status Codes in API Testing:

Used to indicate the result of an API request, with three-digit numbers included in the server's response message.

Role of Headers in Testing APIs:

Crucial for regulating and managing API requests and responses.

JSON in API Testing:

JSON (JavaScript Object Notation) is a simple data exchange format, efficiently used for serialization and deserialization in RESTful APIs.

API Framework Overview:

The API framework involves a config file holding adjustable components and values for test runs, along with automated test cases in "parse-table" format. Not every API needs testing, and the config file should enable or disable specific APIs for a particular run.

Tools for API Test Automation:

NUnit for .NET, JUnit for Java, HP UFT, and SoapUI.

Handling API Authentication in Tests:

Involves embedding authentication elements like tokens, API keys, or OAuth credentials within the proper headers or query parameters of API requests to ensure secure access and validation.

Use of Query Parameters in API Testing:

Query parameters convey additional details within the URL of an API request, enabling customization.

Handling Dynamic Values in API Testing:

Techniques like data-driven testing, parameterization, or test data management address dynamic values like timestamps or random data.

Challenges of API Testing:

  • Selection of Parameters
  • Combination of parameters
  • Call sequencing

In conclusion, attending QA software tester training imparts theoretical knowledge and provides practical insights into the latest QA methodologies and tools. From fundamental concepts to advanced scenarios, these questions and answers aim to prepare individuals for the challenges posed during API testing interviews, enabling them to showcase their expertise in this crucial domain.

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