Postman Interview Questions & Answers

1.What is API testing?
API testing is a type of software testing that involves testing APIs (Application Programming Interfaces) to ensure they function correctly, meet the requirements, and provide the expected output.

2.What is Postman?
Postman is a popular API testing tool that allows developers to create, test, and document APIs. It provides a user-friendly interface for creating requests, sending requests, and inspecting responses.

3.What are the different types of requests in Postman?
Postman supports different types of requests such as GET, POST, PUT, PATCH, DELETE, and more. Each type of request is used for a specific purpose.

4.What is the difference between GET and POST requests?
GET requests are used to retrieve data from a server, while POST requests are used to send data to a server.

5.How do you add headers in Postman?
Headers can be added to a request in Postman by clicking on the Headers tab and entering the key-value pairs.

6.What is the purpose of environment variables in Postman?
Environment variables in Postman allow developers to store and manage values that are shared across multiple requests, collections, or even different environments.

7.How do you set up and use environment variables in Postman?
To set up environment variables in Postman, click on the gear icon in the upper right corner and select Manage Environments. Then, click on Add to create a new environment and enter the key-value pairs. To use environment variables in a request, enclose the variable name in double curly braces (e.g., {{variable_name}}).

8.What is the purpose of a collection in Postman?
A collection in Postman is a group of related requests that can be organized and executed together. It provides a way to manage and share requests, tests, and environments.

9.How do you create a collection in Postman?
To create a collection in Postman, click on the New button in the upper left corner and select Collection. Then, enter a name and description for the collection.

10.What is a request body?
The request body is the data sent by a client to a server as part of an API request. It can be in different formats such as JSON, XML, or form data.

11.How do you send a request with a request body in Postman?
To send a request with a request body in Postman, select the appropriate HTTP method (e.g., POST) and enter the request body in the Body tab. Then, click on Send to send the request.

12.What is the purpose of authentication in API testing?
Authentication is used in API testing to ensure that only authorized users can access the API. It provides a way to protect sensitive data and prevent unauthorized access.

13.How do you add authentication to a request in Postman?
Authentication can be added to a request in Postman by clicking on the Authorization tab and selecting the appropriate type of authentication (e.g., Basic, OAuth 2.0). Then, enter the necessary credentials or tokens.

14.What is the purpose of a test script in Postman?
A test script in Postman is a JavaScript code that is executed after a request is sent. It allows developers to automate tests, validate responses, and perform assertions.

15.How do you write a test script in Postman?
Test scripts can be written in Postman by clicking on the Tests tab and entering the JavaScript code. Postman provides several built-in functions and libraries for writing test scripts.

16.What is the difference between pre-request scripts and test scripts in Postman?
Pre-request scripts are executed before a request is sent and are used to modify the request, set environment variables, or perform other actions. Test scripts are executed after a request is sent and are used.