Postman Api Testing Ppt | Postman Installation

Conclusion

In this tutorial, we discussed the important pointers to get started with the Postman API testing tool. We learned to install the Postman tool as a standalone application and discussed how we can go about creating a simple request and look at the response generated.

We saw how to navigate to the different parts of the response information as well as how to review and retrieve the requests from the history tab.

We believe that by now, you can carry out a successful operation on an API. Successful operation on an API does not mean copy and paste of the entire body, headers, and other necessary blocks and making the test execution successful.

It’s about how comfortable you are in writing your own JSON, navigating to any particular field in a JSON with the help of the document key or params, understanding arrays in JSON, etc.

POSTMAN client tool is used for performing back-end testing and mainly to perform GET, PUT, POST, DELETE calls.

From this tutorial, we learned how to hit the calls from the POSTMAN client and how to validate the response which we get back from the server and also covered the challenges in API testing.

API testing is very important to find loopholes in APIs as hackers will exploit them and cause financial losses. API testing seems simple but we should be very cautious and try testing with every possible combination.

In our upcoming tutorial, we will learn how to use the Postman tool for Diff API Formats!

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Postman is a very famous API testing tool/software that can easily test an API in just a matter of seconds. Additionally, the tool/software is very easy to use and has a very user-friendly interface. However, if you are new to using it then you might face little problems while using it. So, to help you out today we are sharing with you a simple step-by-step guide that you can follow to install, configure and use the Postman tool.

E N D

H How to Use Postman for Testing ow to Use Postman for Testing API? Intro Introduction: duction: Postman is a very famous API testing tool/software that can easily test an API in just a matter of seconds. Additionally, the tool/software is very easy to use and has a very user-friendly interface. However, if you are new to using it then you might face little problems while using it. So, to help you out today we are sharing with you a simple step-by-step guide that you can follow to install, configure and use the Postman tool. API? How Can You Download and Instal How Can You Download and Install Postman API Testing Tool on Your System? l Postman API Testing Tool on Your System? Follow these steps to download and install the Postman API Testing tool on your system: 1.Go to the official website of Postman and select the platform/OS on which you want to install the software. 2.Hit “Download” to download the software on your system. 3.Next, hit the Run” option to start installing the API testing software on your system. 4.Now you will see the “Signup” window on your screen. 5.Login to your Postman account if you have one or hit the “Create Free Account” button and follow on-screen instructions to create a new account. 6.Finally, choose the tools (workspace tools) that you want to use and hit the “Save My Preferences” option to complete the installation process. Want to learn about all the features and functions of Postman? Join our Postman Course in Gurgaon today. How to Create a Get Request? How to Create a Get Request? Follow these steps to create a “Get” request on Postman: 1.Tap on the “orange “New” button which is present on the left side of the software. 2.Now tap on the “Request” button. 3.Next, enter a name for your request. 4.Now hit the “Create Collection” button to create a new collection. 5.Next, enter a name for your collection and tap on the orange checkmark button near it. 6.Now hit the “Save” option to save it. 7.Next, change the request type to “GET.” 8.Now enter the URL that you want to test in the request URL field. 9.Tap “Send.” 10.Finally, you will see the “200 OK” message on your screen. This indicates that you have successfully run the test. How to Create a Post Request? How to Create a Post Request? Follow these steps to create a “POST” request: 1.Click on the “+” button to create a new tab for creating a “POST” request. 2.Now change the request type to “POST.” 3.Enter the URL that you want to use/test in the URL field.

4.Now tap on the “Body” tab. 5.Next hit the “Raw” option and then choose the “JSON” option from the drop-down menu. 6.Now enter the following text: {“text”: “Hello, I am learning how to test APIs!”}. 7.Finally hit the blue “Send” button and you have successfully created your “POST” request. How to Crea How to Create a Parameterize Request? te a Parameterize Request? Follow these steps to create parameterize request: 1.Change the request type to “GET.” 2.Now enter a URL that you want to use in the URL field. For example, enter the following URL in the URL field: https://jsonplaceholder.typicode.com/users. 3.Next, change the first part of the link with a parameter like {{url}}. 4.Now the new URL will be {{url}}/users. 5.Hit “Send.” 6.Now you will see “Couldn’t get a response” on your screen. This is because of the fact that you haven’t set the source of the parameter yet. 7.Next, you have to set the environment. To do this: Tap on the eye icon which is present on the right side of your screen. 8.Now tap on the “Edit” option to set the variable to a global environment. 9.Next, hit the “Edit” option which is present in the “Globals” section to create a variable. 10.Now give a name to your URL like “URL” and hit “Save.” 11.Next, hit the “Close” button if you see the “Manage Environments” window on your screen. 12.Finally, navigate to your “GET” and hit the “Send” button and you will see the results of your request on your screen. Want to learn to use the Postman tool in-depth? Join our Postman Online Course today. Conclusion Conclusion: : Postman is a magnificent testing tool (API testing tool) that allows an API tester to easily test an API by sending requests to the server and receiving its response. Overall it is a spectacular API testing tool and can be very useful for you if you are an API tester. So, carefully follow all the instructions of this guide and you will become a master in using this phenomenal testing tool in no time. Source URL: https://keyposting.com/how-to-use-postman-for-api-testing/

This Step By Step Tutorial Explains API Testing Using POSTMAN Including Basics of POSTMAN, Its Components and Sample Request and Response:

We had a look at the most commonly asked ASP.Net and Web API Interview Questions in our previous tutorial. By going through this tutorial, you will learn how we approach API Testing through POSTMAN for any given URL.

Postman is a very simple and intuitive API testing tool or application. Every component in POSTMAN is very important as it has its own significance.

=> Read Through The Complete API Testing Series Here.

List Of All The Postman Tutorials In This Series

Tutorial #1: Postman Introduction (This Tutorial)Tutorial #2: How To Use Postman For Testing Diff API FormatsTutorial #3: Postman: Variable Scopes And Environment FilesTutorial #4: Postman Collections: Import, Export And Generate Code SamplesTutorial #5: Automating Response Validations with AssertionsTutorial #6: Postman: Pre Request And Post Request ScriptsTutorial #7: Postman Advanced ScriptingTutorial #8: Postman – Command-Line integration with NewmanTutorial #9: Postman – Reporting templates with NewmanTutorial #10: Postman – Creating API DocumentationTutorial #11: Postman Interview Questions

Overview Of Tutorials In Postman Series

Tutorial_Num	What You Will Learn
Tutorial #1	Postman Introduction This Step By Step tutorial explains API Testing Using POSTMAN including Basics of POSTMAN, its Components and Sample Request and Response.
Tutorial #2	How To Use Postman For Testing Diff API Formats This informative tutorial explains How To Use Postman For Testing Different API Formats like REST, SOAP and GraphQL with Examples.
Tutorial #3	Postman: Variable Scopes And Environment Files This Postman tutorial will explain the Different Types of Variables Supported by the Postman Tool and How they can be Used while Creating and Executing Postman Requests & Collections.
Tutorial #4	Postman Collections: Import, Export And Generate Code Samples This tutorial will cover, What Are Postman Collections, How to Import and Export Collections into and from Postman and How to Generate Code Samples in Various Supported Languages Using Existing Postman Scripts.
Tutorial #5	Automating Response Validations with Assertions We will Understand the Concept of Assertions in Postman Requests with the help of Examples here in this tutorial.
Tutorial #6	Postman: Pre Request And Post Request Scripts This tutorial will explain How and When to Use Postman Pre-request Scripts and Post Request Scripts or Tests with the help of Simple Examples.
Tutorial #7	Postman Advanced Scripting We will explore some examples of using advanced scripting with Postman tool that would enable us to run complex testing workflows here.
Tutorial #8	Postman – Command-Line integration with Newman This tutorial will explain How to Integrate or Execute Postman Collections Through the Command-line Integration Tool Newman.
Tutorial #9	Postman – Reporting templates with Newman Reporting Templates that can be used with the Newman Command Line Runner to Generate Templated Reports of Postman Test Execution are explained here in this tutorial.
Tutorial #10	Postman – Creating API Documentation Get to know How To Create Good Looking, Styled Documentation with Minimal Efforts Using the API Documentation Support Provided by Postman Tool in this tutorial.
Tutorial #11	Postman Interview Questions In this tutorial, we will cover some of the most frequently asked Postman Interview Questions around the Postman tool and various API testing techniques.

Table of Contents:

POSTMAN Introduction
POSTMAN Installation
Sample Request And Response
Update: Additional Information
Conclusion

Postman Beginner's Course - API Testing — Postman Beginner’s Course – API Testing

Sample Request And Response

This particular section will give you a deep insight into how to test an API in POSTMAN.

As you can see in the below image, we have our Request which we have already created (Test for SoftwareTestingHelp). Moreover, you can see a drop-down (just beside the URL) which has the verbs or methods that are supported by the POSTMAN.

These are called HTTP verbs. We will try to update something using the PUT method and then we will retrieve the same using the GET method. I assume readers are aware of the functionality of these HTTP verbs that are used in API testing.

Now, we have a URL and a request method. All we require is the headers and payload or body. In some cases, we need to generate tokens (based on the needs of an API).

We will declare our HTTP headers i.e. Content-Type and Accept. Accept is not always compulsory as it decides the format in which we will retrieve our response. By default, the response is always JSON.

There is no need to mug up the values of these headers as POSTMAN will provide you the suggestions when you type in the text areas of the key and value.

Then, we will move on to the next mandatory section which is Body. Here we will provide the payload in the form of JSON. We are aware of how to write our own JSON, hence we will try to create our own JSON.

Sample Request

URL: http://www.mocky.io/v2/5cd6c3f23000004b006061c5

Headers

Content-Type : application/JSONAccept = application/JSON

Body

{ “testedby”: { “saket”: { “creator”: { “name”: “Software Testing Help”, “location”: [ “Pune”, “Bangalore”, “Ranchi” ] } } }, “booksToRead”: [ { “title”: “7 habits of highly effective people”, “price”: 120.00 }, { “title2”: “the business of 21st century”, “price2”: 125.00 } ] }

Now Hit It

Once you have a complete request, click on the “Send button” and see the response code. A 200 OK code stands for successful operation. In the image below you can see that we have successfully hit the URL.

The Next Step

Now, we will perform another operation called GET. We will try to fetch the same record that we have just created.

We don’t require a body or payload for the GET operation. As we already have our sample request using the PUT method, all we require is to change the method to GET.

Once we have changed to GET we will hit the service again. As you can see in the below image, we have exactly got what we passed and this is how POSTMAN works.

POSTMAN Introduction

POSTMAN is an API client used to develop, test, share and document APIs. It is used for backend testing where we enter the end-point URL, it sends the request to the server and receives the response back from the server. The same thing can be accomplished through API Templates like Swagger as well. In both Swagger and POSTMAN, we do not have to build a framework (unlike Parasoft) to fetch the response from the service.

This is the main reason for which POSTMAN is used frequently by the developers and automation engineers to ensure that the service is up and running along with the build version of an API that is being deployed into the region.

It essentially helps in hitting API endpoints by quickly creating requests as per the API specification and dissecting the various response parameters like the status code, headers, and the actual response body itself.

Here is a Video Tutorial:

Postman offers a lot of advanced features like:

API development.
Setting up Mock endpoints for APIs that are still under development.
API documentation.
Assertions for the responses received from API endpoint execution.
Integration with CI-CD tools like Jenkins, TeamCity, etc.
Automating API tests execution etc.

Now, we have gone through the formal introduction of the tool, let’s proceed to the installation part.

Postman API Testing Tutorial | Postman Tutorial For Beginners 2022

1. Testing REST API using POSTMAN
• Postman is a powerful HTTP client for testing
web services. Created by Abhinav Asthana, a
programmer and designer based in Bangalore,
India, Postman makes it easy to test, develop
and document APIs by allowing users to
quickly put together both simple and complex
HTTP requests.
• Postman is available as a native app for Mac,
Windows, and Linux operating systems.

2. Installing the Postman app
• To install Postman, go to the
https://www.getpostman.com/apps
• Click Download for Mac / Windows / Linux depending
on your platform.
• macOS installation
• Once you’ve downloaded app, you can drag the file to
the “Applications” folder. Double click on Postman to
open the application.
• Windows installation
• Download the setup file
• Run the installer

4. Requests
In Workspaces, you can create any kind of HTTP request. The four parts of an HTTP
request are the URL, method, headers, and the body.

5. Responses
The Postman response viewer helps to ensure the correctness of API responses. An API
response consists of the body, headers, and the status code.

6. How does this work?
1. Enter your request details (URL: postman-echo.com/get) in Postman, and hit the Send button.
2. The request is received by the API server (postman-echo.com), and it returns a response.
3. The response is received by Postman, and the response is visualized in the interface.

7. CONSIDERATIONS OF TESTING
WEB SERVICE
A well-constructed API test suite answers questions such as:
• Does the service respond quickly enough for the intended
users?
• Will the server respond with the correct values?(Positive
Testing)
• How will the service handle exceptions and illegal
values?(Negative Testing)
• Is the service stable under expected and unexpected user
loads?(JMETER,LoadRunner)

8. Example of testing IPA of newbook
• API documentation for newbook:
http://newbookalliance.github.io/API/
• Base URL: https://stage-api.newbookmodels.com

9. Policies for all calls
• Clients should add following headers to all requests:
X-Newbook-Client: ‘

‘
X-Newbook-Version: ‘

‘
• API supports content negotiation
Via Accept header: Accept: application/json
• Authorization
API uses token-based authorization via Authorization header:
authorization: ‘

‘
• API Versioning
API uses url-path versioning. That means, you have to add
version prefix (e.g. /api/v1/) to each API url.

11. GET with parameters
• A Get request can pass parameters to the server using “Query String Parameters”.
• For example, in the following request,
https://stage-api.newbookmodels.com/api/v1/cities/?name=Miami
the parameter “name” has the value “Miami”.

12. Test scripts
• With Postman you can write and run tests for each request using the JavaScript
language.
• A Postman test is essentially JavaScript code executed after the request is sent, allowing
access to the pm.response object.

13. Test results
• Postman runs tests every time you run a request.
• Results are displayed in a Tests tab under the response viewer. The tab header shows
how many tests passed, and the test results are listed here. If the test evaluates to true,
the test passed.

14. Signin [POST /auth/signin/]
• The HTTP POST request method is meant to transfer data to a server (and elicit a
response). What data is returned depends on the implementation of the server.
• To send POST request we need:
URL: https://stage-api.newbookmodels.com/api/v1/auth/signin/
Body: example of request body provided in documentation
{
“email”: “[email protected]”,
“password”: “qwer1234”
}

15. POST request structure
1. Choose POST method
2. URL is https://stage-api.newbookmodels.com/api/v1/auth/signin/
3. Go to “Body” tab to configure body
4 and 5 configure content-type.
6. Body in json format

16. Response
• The response returns us “token” (unique key) for clients account.
• In all clients requests(Permissions: IsClient), we have to assign token to the header.

17. Get self data [GET /client/self/]
• URL: https://stage-api.newbookmodels.com/api/v1/client/self/
• For authorization will use token generated from Signin request.

18. Request structure
• URL: https://stage-api.newbookmodels.com/api/v1/client/self/
• For authorization will use token generated from Signin request.
• Response return information about client account

19. Update self user data
[PATCH /client/self/]
• URL: https://stage-api.newbookmodels.com/api/v1/client/self/
• For authorization will use token generated from Signin request.

20. Request structure
• URL: https://stage-api.newbookmodels.com/api/v1/client/self/
• For authorization will use token generated from Signin request.

22. Variables
• Variables allow you to reuse values in multiple places so you can keep your code DRY
(Don’t Repeat Yourself).
• Also, if you want to change the value, you can change the variable once with the
impact cascading through the rest of your code.
• Variables can be used in the following form in the Postman user interface –
{{variableName}} .
• The string {{variableName}} will be replaced with its corresponding value when
Postman resolves the variable.
• For example, for an environment variable url with the value http://localhost , you will
have to use {{url}} in the request URL field.

26. Links for more information
• https://www.getpostman.com/docs/v6/
• https://docs.postman-echo.com/

27. TYPES OF HTTP REQUESTS
• GET – Retrieves the data from a specified source
• POST- Sends new data to a specified source
• PATCH- Updates info for a specified source
• DELETE- Removes data from a specified source

28. HTTP STATUS CODE
• 1XX- Codes between 100-199 mean that the server is
working on the request. Not so common
• 2XX- Codes between 200-299 mean that the request was
successful.
• 3XX- Codes between 300-399 mean that the request was
not performed.
• 4XX- Codes between 400-499 mean that the request is
incomplete and may need more info
• 5XX- Codes between 500-599 mean that the server
encountered an error.

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Postman
1.
Postman API development tool
2.
Postman – API
development tool • Design • Manage • Run • Test • Documentation • Share
3.
–Undisclosed team mate “But
it is just GUI for cURL.”
4.
Why?
5.
Complex systems
6.
Team collaboration
7.
Web and mobile
development
8.
Light theme
9.
Request
10.
Request
11.
Request headers
12.
Request forms
13.
Response
14.
Response
15.
Collections and folders
16.
Collections and folders
17.
Environments
18.
Environment variables
19.
Environment variables • URLs •
API keys • Auth tokens • etc.
20.
Code generation
21.
Tests
22.
Tests
23.
Test results
24.
Test results
25.
Tests • Sandbox • Supported
packages • LoDash • cheerio (simple jQuery) • CryptoJS • SugarJS • tv4 JSON schema validator
26.
Newman • Command-line runner •
Open-source • NPM package
27.
Newman
28.
Documentation (Markdown)
29.
Share • Import/Export • Sync
with cloud • Life hack: use single account 🙂 • Teams – $5/user per month
30.
Alternatives
31.
Paw • $50 • MacOS
only • Beautiful and sleek • Teams – $10 / user monthly
32.
Insomnia • Free • All
platforms (Electron) • Cleaner UI than Postman • Less features 🙁 • Teams – $5 / user monthly
33.
Command line tools •
curl • wget • HTTPie • resty
34.
Services • Apigee • Apiary •
Restlet Studio
35.
Swagger / Open
API • API description format • Many tools • Editor • Code generator
36.
Conclusions • Use any
tool • Share your API • Especially in the team • Especially for complex project
37.
Igor Shubovych @igor_shubovych github.com/igorshubovych
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API Development And Testing Cycle With Postman Tool

This slide illustrates Application Programming Interface API testing pipeline with Postman platform. It includes build test collection, newman, analytics, monitor, etc.

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Update: Additional Information

What is an API?

API (Application Programming Interface) is a jar file, which contains several methods and interfaces to perform a particular action.

Refer to the below Example and screenshot:

Create a sum method, which adds two variables and returns the sum of two variables.
Then create a calculator class that contains several other methods like addition, subtraction, multiplication, division and so on. There may be some helper classes as well. Now combine all the classes and interfaces and create a jar file called Calculator.jar and then publish it. Use Calculator API to access the methods present inside.
Some APIs are open source (Selenium) which can be edited and some are licensed ones (UFT) which cannot be edited.

Suggested Read => Top API Management Tools

How exactly are these methods getting called?

Developers will expose an interface, a platform to call the calculator API and we create the object of calculator class and call the sum method or any method.

Suppose this calculator.jar file is created by some company and they use this utility through UI interface, then we test this calculator application using UI and automate it using QTP/Selenium and this is called Front End Testing.

Some applications don’t have UI, thus in order to access these methods, we create an object of the class and pass on the arguments to test and this is called Back-End Testing. Sending the request and receiving back the response will happen through JSON/XML files.

Refer to the below diagram:

POSTMAN Client

POSTMAN is a REST client used for performing backend API testing.
In POSTMAN, we pass the API call and check the API response, status codes and payload.
Swagger is another HTTP Client tool where we create API documentation and through swagger, we can also hit the API and get the response.
Refer the link https://swagger.io/
You Can use either Swagger or POSTMAN to test the APIs, and it depends on companies as which client to use.
In POSTMAN mostly we use GET, POST, PUT and DELETE calls.

How to Download POSTMAN Client?

Open Google Chrome and download the POSTMAN app available in the Chrome app store.

Call REST APIs Using POSTMAN Client

In POSTMAN we got many methods but we use only GET, PUT, POST and DELETE

POST – This Call creates a new entity.
GET – This call sends the request and receives the response.
PUT – This call creates a new entity and updates the existing entity.
DELETE – This call deletes the existing entity.

API’s can be accessed either by using UI like banking platform or where UI is not available like the backend systems where we use REST API client like POSTMAN.

Other clients are also available like SOAP UI which is a REST and SOAP client, advanced REST clients like JMeter can call the APIs directly from the browser. POSTMAN is the best tool for performing POST and GET operations.

Also Read => List of In-Depth SoapUI Tutorials

Send a request and get a response in POSTMAN Client:

For testing purpose, we use the API’s provided here.

Check each CRUD call in the POSTMAN client using the API’s provided by the dummy site.

In API testing we mainly validate the below points:

The response status codes, refer wiki page for details.
The response message and the JSON response body.
In API testing, first, ask the developer to give the endpoint URL. See this endpoint URL https://reqres.in/.

#1) GET Call

Sends the request and receives the response.

Steps for testing REST API:

Pass https://reqres.in//api/users?page=2 [? is a query parameter which filters out the result like print all the information of the user in page 2, the query parameter depends upon the developer as how they will define] as URI in the POSTMAN client.
The query parameter is defined by (?) and the path parameter is defined by (/).
Select the GET method.

Provide Headers (if required) like User-Agent: “Software”.

Click on the SEND button.
If API is working fine, in response we get:
- Status 200 – OK, this means that the response is received successfully.
- Response JSON Payload.
- String Message

Another Example of the GET METHOD, where we searched for information about a specific user i.e. user id =3. Enter URI = https://reqres.in/api/users/3

If data is not available against our search, we get blank JSON and 404 status message.

#2) POST Call

Create a new user or an entity.

Steps to Execute:

Select a POST from the dropdown and use this service URL “https://reqres.in/api/users/100”
Go to Body – > select RAW -> As we are passing JSON.
Select JSON from the dropdown and paste the payload script.
Pass this payload {“name”: ”Morpheus”, ”job”: ”leader”}

JSON starts with curly braces and stores data in the key, value format.
Pass the header content type = application/json.
Press the SEND button.

On successful request, we get the below response:
- Status 201 – Created, the response is received successfully.
- Response Payload
- Header

#3) PUT Call

Updates or creates a new entity.

Steps to create PUT call:

Use this service URL “https://reqres.in/api/users/206” and payload {“name”: “Morpheus”,”job”: “Manager”
Go to POSTMAN client and select PUT method -> Go to Body – > Select RAW > pass JSON and select JSON from the dropdown and paste the payload script.
JSON starts with curly braces and stores data in the key-value format.
Press the SEND button, for a successful request, you will get the below response.
- Status 200 – Ok, the response is received successfully.
- Response Payload
- Header
- Job updated to “manager”

#4) Delete Call

Delete the user, use this service URL “/api/users/423” and this payload {“name”: “Naveen”,”job”: “QA”}.
Go to POSTMAN and select DELETE method, payload not required.
Deletes user id =423 if available in the system.
- Status 204 – No Content, the response received successfully.
- No Payload received, user id deleted.
- Header

Challenges in API Testing

Test cases should be designed in such a way that it should cover test coverage.
Designing test cases are simple when the API carries fewer parameters but the complexity increases when the number of parameters is large.
Regularly update your test coverage with a change in the business requirement. If a new parameter is added increase the test harness suite
Sequencing API calls properly.
Explore boundary conditions and performance.

What is Postman ?? || How to use Postman?? || Postman Tool For Beginners

POSTMAN Installation

Postman is available in 2 options.

As a Chrome app (this is already deprecated and has no support from the Postman developers)
Native App for different platforms like Windows, Mac OS, Linux, etc.

As Chrome apps are being deprecated and have a tight coupling with Chrome browser (in a few cases the actual browser version), we will focus mostly using the Native application that gives us more control and has lesser external dependencies.

Postman Native App

Postman Native app is a standalone app that is available for download in various OS platforms like Windows, Mac OS, Linux, etc. This can be downloaded just like any other application depending upon the user’s platform.

The installation process is pretty straightforward as well. You simply need to double click on the downloaded installer (for Windows and Mac) and follow the instructions.

Once the installation is successful, simply open the Postman Application to get started with.

We will see how to create a simple request for any available open-source API and see the various components of the request and response received when the request is executed using the Postman application.

It’s highly recommended, to sign-in/sign-up into the Postman application using an existing email account. A signed-in account preserves all the Postman collections and requests that are saved during the session and ensures that the requests are still available to work with when the same user logs-in next time.

Please refer to the Note section to get details about the publicly available fake API endpoint.

We will illustrate a sample GET request to this URL which would return 100 posts in response as a JSON Payload.

Let’s get started and look at the steps that need to be followed:

#1) Open the Postman Application (If not already logged in with the existing or new account, first log in with the appropriate credentials).

Given below is the image of the Postman UI initial screen:

#2) Create a new request and fill in the details as per the endpoint that we will be using for our test or illustration. Let’s test a get request for a REST API endpoint http://dummy.restapiexample.com/api/v1/employees

#3) Once the request properties are filled in, hit SEND to execute the request to the server hosting the endpoint.

#4) Once the server responds, we can check the various data around the response.

Let’s see each of them in detail.

By default, once the response completes, the response body tab is selected and displayed. Other parameters for a response like the response status code, the time taken for the request to complete, the size of the payload are shown just below the request headers (as in the below figure).

To get fine-grained details about the response parameters like Response size and Response time, you can simply hover over each of those values, and Postman will show you a detailed view with more fine-grained details for each of those properties.

For example, for Request time – it will further dissect it into individual components like Connect time, Socket time, DNS lookup, Handshake, etc.

Similarly, for Response size, it will show you a breakup of how much size the headers are constituted, and what is the actual response size.

Now, let’s look at the other response tabs i.e. Cookies and Headers. In the web world, Cookies hold a lot of importance in terms of driving client-side experiences and lots of session related info to get all the information about the cookies that were returned from the server. You can switch to the cookies tab and see this.

Similarly, response headers contain a lot of beneficial information about the request that got processed. Just navigate to the headers tab in the response section to take a look at the response headers.

An important point to note here is that all the requests that you make to the server are stored in the Postman history for future reference (The History tab is available on the left side panel of the app).

This helps in preventing the creation of requests every time when you need to get a response for the same request and also helps in avoiding mundane boilerplate tasks. If required, you can refer to the past requests (And responses as well) at a future point of time.

Note: To illustrate sample requests and responses, we will be using publicly available fake API servers that will allow all types of HTTP requests to be made and that return a valid HTTP response.

To name a few, we will be using the below fake API endpoint sites as a reference:

Alternative Quick Postman Installation Guide

POSTMAN is an open tool and is available for anyone who surfs the internet. You can follow the below steps and get the POSTMAN tool installed in your local machine.

Step 1: Open Google and search for the POSTMAN tool. You will get the below search-result. Then you can click on Download Postman App and you will be redirected to the getpostman website.

Else, you can directly navigate to this URL to get the POSTMAN tool.

Step 2: Select the POSTMAN version based on your operating system. In our case, we are going to use POSTMAN for Windows OS. Moreover, we are using Window-64 bit, so we will download and install POSTMAN for 64 bit.

Step 3: Once you have clicked on the Download button, a postman.exe file will be download into your local. Click on that file. It’s a one-click installation just like any other application that will let you install the POSTMAN add-on for your browser.

Step 4: After you have installed the application, click on the application (which must be placed on your desktop). As you can see in the below image, we have six different entities for which you will basically need three building blocks i.e. Request, Collection, and Environment which will be discussed in the next section.

That’s it!! We have successfully installed and launched the POSTMAN application.

Building Blocks Of POSTMAN

POSTMAN has a variety of building blocks but for our purpose, we are going to discuss the three major building blocks that are essential for every POSTMAN operation.

These three major building blocks are:

#1) Request

A request is nothing but a combination of the complete URL (which includes all parameters or keys), HTTP headers, body or payload. These attributes altogether form a request. POSTMAN lets you save your request and this is a good feature of the app that lets us use the same request as many times as we want.

Click on New -> Request

#2) Collection

There must be something where you will save your bulk requests. This is the scenario where collection comes into the picture. We can say that a collection is a repository in which we can save all our requests. Generally, the requests that hit the same API are kept in the same collection.

Click on New -> Collection.

#3) Environment

An Environment is a region where all your operations on an API will take place. It could be TUP, QA, Dev, UAT or PROD. Each project will already have the regions configured and you just have to declare your global variables such as URL, token’s id and password, context keys, API keys, document keys and so on in it.

Click on New -> Environment.

Saving A Request Into Collection

Now we will try saving a sample request into a collection and we will use the same request to hit an API.

Step 1: In the top right corner, you will see the “+New” button. Click on this button and you will have the list of the building blocks that were shown when you launched the application for the first time.

Step 2: Click on Request.

Step 3: Provide the request name which is a mandatory field. Then click on “+ Create Collection”.

Step 4: Once you have clicked on “+ Create Collection”, it will ask for a name (say Sample Collection). Input the name of the collection and hit enter.

Step 5: Click on the “Save to Sample Collection” button.