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API TESTING USING POSTMAN
A Presentation By:
Asmita Poudel
Swostika Shrestha

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Introduction to API testing and its tools:
• API
• Types of API
• API Testing
• Importance
• API Tools
Introduction to Postman:
• Definition
• Installation
• Workspace
• Pros & Cons
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In this presentation we will cover:
Table of Contents

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● is a software interface that allows two applications to interact with
each other without any user intervention
● can be used to get access to data from the third parties.
● can be used to hide complexity and perform the task
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API ( Application Programming Interface )
API

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Open APIs: These types of APIs are publicly available to use like OAuth APIs from Google. It has also not given
any restriction to use them. So, they are also known as Public APIs.
Partner APIs: Specific rights or licenses to access this type of API because they are not available to the public.
Internal APIs: Internal or private. These APIs are developed by companies to use in their internal systems. It
helps you to enhance the productivity of your teams.
Types of API

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Web services are the services available over the web(API wrapped in HTTP)
If we put the api on the web, then it is a web services
Web Services might not perform all the operations that an API would perform
A web services needs a network while an API doesn’t need a network for its operation
Types of Web Services
RESTful :Representational State Transfer
Latest technology
we can send the request and get response in XML,JSON,Text etc
We can send different request get, put, post, delete
SOAP: Simple Object Access Protocol
Old technology
can send only post request and get response only in XML format
All web services are APIs, but all APIs are not web services
API & Web Services

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is a process of sending requests to an API and monitoring the responses to ensure its behaving as expected
designed to assess the functionality, reliability, performance, and security of an API
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API Testing

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● can be faster than GUI (graphical user interface) testing as it allows you to test multiple functionalities at once
and does not require the GUI to be loaded each time a test is run
● can help identify performance issues and bottlenecks, allowing to optimize the API for better performance.
● API tests are technology and language independent. Data is exchanged using JSON or XML and it contains
HTTP requests and responses.
● Enables developers to identify any errors earlier in the development process
● can help identify security vulnerabilities and ensure that the API is protected against malicious attacks.
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Why API Testing is Important?

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Some of the most commonly used API testing tools are:
API Testing Tools

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Postman is:
• A standalone software testing API platform to build, test, design, modify, and document APIs
• Scalable API testing tool
• Powerful tool to test environments
• Build test suites called collections and let Postman interact with the API
• Has the ability to make various types of HTTP requests like GET, POST, PUT, PATCH, and convert the API
to code for languages like JavaScript and Python.
Introduction to Postman

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● Requests
● Collections
● Environment
REQUESTS
● A combination of URLs, HTTP headers, Body forms a request.
● HTTP : the collection of rules for the transmission of data on the World Wide Web, like graphic images, text, video,
sound, and other multimedia data.
● The most popular HTTP methods:
1.GET : Get requests are used to retrieve information from the given URL.
2.POST : Post requests are used to deliver new data to API
3.PATCH: used to update already exists data
4.PUT: used to update already exists data
5.DELETE: used to delete already existing data
Building Blocks of Postman

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● Requests
● Collections
● Environment
COLLECTIONS
● A Collection means a group of API requests that you have already saved in the Postman. You can arrange
these requests into folders.
● There are two ways to run collections in Postman:
1.Collection Runner
2. Newman
Building Blocks of Postman

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● Requests
● Collections
● Environment
ENVIRONMENTS
● A set of variables you can use in your Postman requests
● In Environments, we can execute requests and collections against various data sources
Building Blocks of Postman

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Installation of Postman

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POSTMAN NAVIGATION

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Pros of Postman
• Sharing the collection across team
• Environments can be organized as per users' need.
Cons of Postman
• Database connectivity - To get data directly from DBs
• Data Generator - Random data generator like email, names, zip/postal codes, addresses, mobile number.
Pros and Cons

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Thank You