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Table of Contents<\/div>\n<\/p><\/div>\n<\/div>\n<\/div>\n

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Hitting POST Requests and chain 2 requests using Postman<\/a><\/div>\n

1. What you will Learn in this blog?<\/a><\/div>\n

2. \u00a0Hit POST request without parameters<\/a><\/div>\n

3.\u00a0Hit POST request with parameters<\/a><\/div>\n

4.\u00a0Save the POST Request<\/a><\/div>\n

5.\u00a0Generate random unique IDs<\/a><\/div>\n

6.\u00a0Capture static id and use it in another POST request<\/a><\/div>\n

7.\u00a0Generate random id and use it in another POST request<\/a><\/div>\n<\/div>\n

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Hitting POST Requests and chain 2 requests using Postman<\/b><\/h3>\n
Welcome you all to the brand new \u2018API Testing\u2019 blog series! In the previous blog, we had studied how to execute GET requests using Postman. In this tutorial, we will look at POST requests. We will also see how to chain GET and POST requests!! So let us begin!!!\u00a0<\/p>\n
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1. What you will Learn in this blog?<\/b><\/b><\/h3>\n
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Hit POST request without parameters<\/li>\n
Hit POST request with parameters<\/li>\n
Save the POST Request<\/li>\n
Generate random unique IDs<\/li>\n
Capture static id and use it in another POST request<\/li>\n
Generate random id and use it in another POST request<\/li>\n<\/ul>\n
2. <\/b><\/b>\u00a0<\/b><\/b>Hit POST request without parameters<\/b><\/b><\/b><\/h3>\n
Let us now look at POST request. See below, we have \/post<\/b> method that we can append with URI<\/p>\n<\/div>\n
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So, let us create a new request, select POST from dropdown, enter the URI and append it with \/post<\/b> as shown below<\/p>\n<\/div>\n
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Since this is a POST request, we have to send some body (data) as part of this request. When we execute this request, the data will be posted(created) on the server viz a new record will get created on the server side.<\/p>\n
To add the body, see below. Go to the \u2018Body\u2019 section, select \u2018raw\u2019 radio button and further select JSON from the dropdown<\/p>\n<\/div>\n
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Add a very simple json body<\/p>\n<\/div>\n
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Click Send.<\/p>\n
The server sends the response in the form of json data output. The status code is 200<\/p>\n<\/div>\n
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3.\u00a0<\/b><\/b>Hit POST request with parameters<\/b><\/b><\/b><\/b><\/h3>\n
Let us now add 2 parameters as part of our POST request<\/p>\n<\/div>\n
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Click Send.<\/p>\n
As expected, the 2 parameters are seen as arguments in the response body, see below<\/p>\n<\/div>\n
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The complete response body is as shown below<\/p>\n<\/div>\n
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4.\u00a0<\/b>Save the POST Request<\/b><\/b><\/b><\/b><\/b><\/h3>\n
Let us save this POST request by giving it some name and adding it to the same collection that we had created in our last blog<\/p>\n<\/div>\n
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Our collection now has 3 requests (2 GET requests and a single POST request)<\/p>\n<\/div>\n
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5.\u00a0<\/b>Generate random unique IDs<\/b><\/b><\/b><\/b><\/b><\/b><\/h3>\n
Let us see how to generate random unique IDs using the \/uuid<\/b> method. This method can be seen in the website as shown below<\/p>\n<\/div>\n
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Copy the URI https:\/\/httpbin.org\/uuid<\/b><\/a><\/p>\n
Paste it as shown below (this is a GET request)<\/p>\n<\/div>\n
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Click Send.<\/p>\n
Notice below that a unique id is generated in the response body<\/p>\n<\/div>\n
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Click \u2018Send\u2019 again.<\/p>\n
Notice below that another unique id is generated and is different from the above id<\/p>\n<\/div>\n
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This way, we can keep generating different unique random IDs.<\/p>\n
6.\u00a0<\/b>Capture static id and use it in another POST request<\/b><\/b><\/b><\/b><\/b><\/b><\/b><\/h3>\n
Sometimes, we have a requirement to capture response of 1st request and send that response as an input to the 2^{nd<\/sup> request.\u00a0<\/p>\n}
Another similar requirement can be: to generate a random id (uuid), capture this id and send it as part of another POST request. The below diagram depicts this scenario<\/p>\n<\/div>\n
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Let us first see how to capture the static<\/u> id from one request and use it in another request.<\/p>\n
Click \u2018Tests\u2019 section<\/p>\n<\/div>\n
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Under \u2018Tests\u2019 section, we see a snippet \u2018Set a global variable\u2019. We can use this snippet to work with the variables<\/p>\n<\/div>\n
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Click this function \u2018Set a global variable\u2019. The below code gets generated<\/p>\n<\/div>\n
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In the above sample code, we can see 2 global<\/u> variables: \u2018variable_key\u2019 and \u2018variable_value\u2019.<\/p>\n
Since these are global variables, we can call and use them in other requests as well.<\/p>\n
Let us suppose the value of the variable \u2018variable_key\u2019 is uuid<\/p>\n<\/div>\n
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Let us hard code the value of the variable \u2018variable_value\u2019 as t123, see below<\/p>\n<\/div>\n
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Click \u2018Send\u2019 to execute the GET request<\/p>\n<\/div>\n
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Now we would like to send the above global \u2018uuid\u2019 variable in another POST request.<\/p>\n
We have one POST request saved in our collection<\/p>\n<\/div>\n
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Open this POST request. Make sure \u2018Body\u2019 and \u2018raw\u2019 section are selected as shown below<\/p>\n<\/div>\n
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To capture the value of global \u2018uuid\u2019 variable (from our GET request), we need to mention the \u2018uuid\u2019 variable in double curly braces {{}} as shown below<\/p>\n<\/div>\n
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So basically, we have created a variable \u2018id\u2019 as shown above and the value of this \u2018id\u2019 variable would be the value of \u2018uuid\u2019 variable that would be fetched from the GET request.<\/p>\n
Click \u2018Send\u2019 to execute this POST request.<\/p>\n
Notice the json response below. The value of \u2018uuid\u2019 variable (t123) gets fetched from the GET request \u00a0<\/p>\n<\/div>\n
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7.\u00a0<\/b>Generate random id and use it in another POST request<\/b><\/b><\/b><\/b><\/b><\/b><\/b><\/b><\/h3>\n
In the above scenario, we captured the hard coded value of uuid from GET request and used it in another POST request.<\/p>\n
Our actual requirement is to capture the random (dynamic) uuid from one request and use it in another request.<\/p>\n
Recall that, below is the sample random uuid as part of json response<\/p>\n<\/div>\n
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To capture this json response, we can use the below code snippet. We are defining a variable jsn_response and inside this variable we are capturing the json response at runtime. Notice that we have pm.response.json()<\/b> method available<\/p>\n<\/div>\n
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So we can write<\/p>\n<\/div>\n
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So the variable jsn_response <\/b>holds the entire json response, including the value of uuid that gets generated during runtime, example, ec7e14f4-ef6e-47c9-9ec0-63b6524d7a94.<\/p>\n
Next, we will remove the hard coded value \u2018t123\u2019. Instead of that, we will write jsn_response.uuid<\/b><\/p>\n<\/div>\n
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\u00a0<\/b>So we have<\/p>\n<\/div>\n
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Let us now hit the \u2018Send\u2019 button of this GET request. The random uuid gets generated<\/p>\n<\/div>\n
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Let us now go to the POST request and hit the \u2018Send\u2019 button. Notice below that the value of \u2018id\u2019 is same as the value of uuid that was generated in the above screenshot<\/p>\n<\/div>\n
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Go to the GET request and let us hit the \u2018Send\u2019 button one more time. Note down the value of uuid, see below<\/p>\n<\/div>\n
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Go to the POST request and hit the \u2018Send\u2019 button.<\/p>\n
Notice that the value of \u2018id\u2019 is same as the value of \u2018uuid\u2019 generated above<\/p>\n<\/div>\n
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Save the requests<\/p>\n<\/div>\n
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Let us drag \u2018GET_uuid\u2019 request above \u2018POSTwithParams\u2019, see below<\/p>\n<\/div>\n
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So this is how we can chain the GET and POST requests.<\/p>\n
In the next article, we will perform some Test validations in the POST request. We will also see how to handle cookies.<\/p>\n
Thank you for reading!<\/p>\n<\/div>\n<\/div>\n<\/div>\n
<\/div>\n<\/section>\n
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1. What you will Learn in this blog?<\/b><\/b><\/h3>\n\nHit POST request without parameters<\/li>\nHit POST request with parameters<\/li>\nSave the POST Request<\/li>\nGenerate random unique IDs<\/li>\nCapture static id and use it in another POST request<\/li>\n