How to loop a jmeter request? - jmeter

Question

I have a request https://***********/projects?page=1
which gives the response
{
"QueryInfo": {
"QryNa": "Q_PTE1",
"resourc": "https://******************QueryResultsAsXML.v2/q/?auth=",
"CurrentPage": "page=1",
"FirstPage": "page=1",
"LastPage": "page=6",
"Rows": "1000",
"TotalRows": "6000"
}
}
I have to verify the LastPage, if it's more than 1 I have to run the same above request for all Pages numbers from 1 to 6. I have captured the page number in regular expression. Can you tell how to loop for this scenario?

Answer 1

Add an If Controller with condition ${__jexl3("${LastPage}" > 1)} where LastPage is the reference name for your regular expression extractor.
Add a loop controller and change the loop count to ${__intSum(${LastPage},-1)}
Add a Counter under the loop controller with below configurations
Start: 2
Increment: 1
Maximum: ${LastPage}
Reference Name: pageCounter
Make sure to check both Track counter independently for each user & Reset counter on each Thread Group iteration
Copy & paste your HTTP request under the loop controller and change page parameter to page=${pageCounter}

Answer 2

Add Regular Expression Extractor as a child of the request which returns the above response and configure it like:
Name of created variable: anything meaningful, i.e. lastPage
Regular expression: "LastPage"\s?:\s?"page=(\d+)",
Template: $1$
Add If Controller after the request and use the following condition:
${__groovy((vars.get('lastPage') as int) > 1,)}
Loop Controller as a child of the If Controller and use the following expression as the "Loop Count":
${__groovy((vars.get('lastPage') as int) -1,)}
Add HTTP Request sampler as a child of the Loop Controller and amend the request body to look like:
{
"QueryInfo": {
"QryNa": "Q_PTE1",
"resourc": "https://******************QueryResultsAsXML.v2/q/?auth=",
"CurrentPage": "page=${__intSum(${__jm__Loop Controller__idx},2,)}",
"FirstPage": "page=1",
"LastPage": "page=6",
"Rows": "1000",
"TotalRows": "6000"
}
}