What is API Testing?
API testing is a type of software testing that validates Application Programming Interfaces (APIs). It checks whether the APIs function correctly, return expected results, handle errors, and integrate smoothly with other services. API testing is critical because missing cases can lead to failures in production that are hard to debug.
- Early Evaluation – APIs are tested early in the development cycle to detect issues sooner.
- CI/CD Compliance – APIs can be validated automatically in pipelines, improving efficiency.
- Security – API testing includes fuzz, penetration, and security checks.
- Time & Cost Savings – Automation reduces manual effort and cost.
- Platform Agnostic – APIs can be tested across different technologies.
API testing is often performed using tools like Postman. The development team provides the API endpoint (URL), payload (usually JSON), and authentication credentials. Testers then modify payloads according to test cases and check responses for correctness, errors, and edge cases.What are the Challenges in API Testing?
- Initial setup and environment configuration.
- Sequencing API calls to ensure dependencies are tested properly.
- Validating and testing multiple parameter combinations.
- Updating schemas when APIs evolve.
- Lack of proper documentation.
- Lack of standardization across APIs.
Request headers, response body, and response cookies are typically visible.
Which type of encoding does Postman accept for authorization credentials?
Postman accepts Base64 encoding. It converts credentials into textual form for easier transmission (e.g., in HTML forms).
Can global scope variables have duplicate names in Postman?
No. Global variables are unique across all environments. Only local/environment-specific variables can have the same names.
What is a Postman Collection?
A Postman Collection is a group of API requests organized into folders. It helps in structuring and reusing requests for testing
What do you mean by Postman monitors?
Postman Monitors allow you to schedule and run collections at defined intervals. They help automate testing and share reports via email.
What do you understand by the term Postman Collection runners?
The Collection Runner in Postman allows data-driven testing by running requests multiple times with different sets of input data.
How do you remove local variables?
Local variables in Postman are temporary and are removed automatically once the test run ends.
How can we stop executing requests or stop the collection run?
By using the command: postman.setNextRequest(null).
How can we access a Postman variable?
Postman variables are accessed using double curly braces syntax: {{variableName}}.
How can you iterate a request 100 times in Postman?
This can be done using the Collection Runner with a CSV/JSON data file that iterates requests multiple times.
What will execute first in a Collection Run?
Pre-request scripts at the Collection level are executed first before requests are sent.
How can we log requests and responses in Postman?
Requests and responses can be viewed in the Postman Console, which logs all request/response details.
What are the main challenges of API testing?
• Parameter selection.
• Parameter combination testing.
• Call sequencing.
• Proper error handling and validation.
• Lack of complete documentation from developers.---------------- Please Like and comment !!-------------
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