[FIXED] How to read only certain number of entries from json file in jmeter?

Issue

I am sending json files as body. There are like 10k json files so I am using Directory Listing Config in jmeter plugin. While reading the json file I am using this:

${__FileToString(${file},,)}

to read file information. Json file looks like this:

{
  "type": "transaction",
  "entry": [
    {
      "fullUrl": "urn:oaeignaeogin",
      "resource": {
        "resourceType": "Player",
        "id": "aegaegaeg-aega-aegg-aegeag-aegaegeag",
        "text": {
          "status": "generated",
          "div": "<div xmlns=\"stuff"
        },
        "multipleBirthBoolean": false,
        "communication": [
          {
            "language": {
              "coding": [
                {
                  "system": "urn:437",
                  "code": "en-US",
                  "display": "English"
                }
              ],
              "text": "English"
            }
          }
        ]
      },
      "request": {
        "method": "POST",
        "url": "Patient"
      }
    }
  ]
}

What do I do so that I only read entries upto 25 entries and then send it as body? Any help is appreciated.

Solution

Your JSON file contains only one entry element

If there are files with more than one entry and you need to send only first 25 you will need to parse the JSON using JSR223 PreProcessor, extract first 25 entries, re-build the JSON and overwrite the variable.

1. Add JSR223 PreProcessor as a child of the request which you need to send

2. Put the following code into "Script" area:

   def json = new groovy.json.JsonSlurper().parse(new File(vars.get('file')))
   if (json.entry.size() > 25) {
       json.entry = json.entry.take(25)
   }
   
   vars.put('payload', new groovy.json.JsonBuilder(json).toPrettyString())
   

3. Replace ${__FileToString(${file},,)} in the "Body Data" tab of the "HTTP Request" Sampler

More information:

• Apache Groovy - Parsing and Producing JSON
• Apache Groovy: What Is Groovy Used For?

Answered By - Dmitri T
Answer Checked By - Mildred Charles (JavaFixing Admin)