Jmeter Dynamic Json Array Generation from CSV file - json

Question

I have a following Json data to post.
{
"id": 1,
"name": "Zypher",
"price": 12.50,
"tags": [{
"tag": 1,
"tagName": "X"
},
{
"tag": 2,
"tagName": "Y"
},
{
"tag": 2,
"tagName": "Z"
}]
}
My Jmeter Test Plan is as following,
- Test Plan
- Thread Group
- Http Request Defaults
- Http Cookie Manager
- Simple Controller
- CSV Data Set Config (Sheet_1)
- Http Header Manager
- Http Request (The hard coded json was provided here as body data)
Every thing works fine. Now I want to use csv to parametrised my Json.
Sheet_1:
id,name,price
1,Zypher,12.50
I modified json with these 3 parameters and its works for me. Now I want to parametrise detail portion. I have no idea how to do this.
All I want to keep my json like this,
{
"id": ${id},
"name": ${name},
"price": ${price},
"tags": [
{
"tag": ${tag},
"tagName": ${tagName}
}]
}
How could I dynamically make json array tags for details portion from csv data? I want it to be looped as row provided in csv file.
Updated csv
id,name,price,tag,tagname
1,Zypher,12.50,7|9|11,X|Y|Z
It would be great in this format
id,name,price,tag
1,Zypher,12.50,7:X|9:Y|11:Z
tag has two properties dividing by :

Answer 1

You can do it using JSR223 PreProcessor and Groovy language, something like:
Given you have the following CSV file structure:
id,name,price,tag
1,Zypher,12.50,X|Y|Z
And the following CSV Data Set Config settings:
Add JSR223 PreProcessor as a child of the HTTP Request sampler and put the following code into "Script" area:
import groovy.json.JsonBuilder
def json = new JsonBuilder()
def tagsValues = vars.get("tags").split("\\|")
class Tag {int tag; String tagName }
List<Tag> tagsList = new ArrayList<>()
def counter = 1
tagsValues.each {
tagsList.add(new Tag(tag: counter, tagName: it))
counter++
}
json {
id Integer.parseInt(vars.get("id"))
name vars.get("name")
price Double.parseDouble(vars.get("price"))
tags tagsList.collect { tag ->
["tag" : tag.tag,
"tagName": tag.tagName]
}
}
sampler.addNonEncodedArgument("",json.toPrettyString(),"")
sampler.setPostBodyRaw(true)
Remove any hard-coded data from the HTTP Request sampler "Body Data" tab (it should be absolutely blank)
Run your request - JSON payload should be populated dynamically by the Groovy code:
References:
Parsing and producing JSON - Groovy
Groovy Is the New Black
Update:
for CSV format
id,name,price,tag
1,Zypher,12.50,7:X|9:Y|11:Z
Replace the below Groovy code:
List<Tag> tagsList = new ArrayList<>()
def counter = 1
tagsValues.each {
tagsList.add(new Tag(tag: counter, tagName: it))
counter++
}
with
List<Tag> tagsList = new ArrayList<>();
tagsValues.each {
String[] tag = it.split("\\:")
tagsList.add(new Tag(tag: Integer.parseInt(tag[0]), tagName: tag[1]))
}