How to send JSON data from csv file in POST method

Question

In my project I am using Jmeter for load testing.
I have created a test plan as follows:

1. Login to the application using a csv file which has 10 unique username and password (successfully done)
   
2. A regular expression extractor will get the session id from the response which will be used in the next sampler for submitting a request. (sessionId extracted successfully)

3. The next sampler will submit a request. This sampler accepts two parameters: sessionId & licenseRequest. A little details for the java-script is as follows:

   url: "groovy/enqueue",
   type: "POST",
   global: false,
   data: {sessionId: uSessionId, licenseRequest: JSON.stringify(requestJSON) },
   dataType: "text",
   

For submitting the request I have created a csv file.
The csv is similar like this:

Entry 1:
{"activations":["<activation-code>","<activation-code>"],"email":"<emailIdofUser>","csvEntries":[{"model":"<modelname>","serial":"<serialNo>"}],"comment":"testing jmeter"}

What I have found out that while submitting the request in th second sampler the post request is malformed:

POST data:
sessionId=vZNjFjW38cid&licenseRequest=%3CEOF%3E

As you can see the licenseRequest's value is not correct. It is sending the EOF, which is not desired.

Answer 1

Ensure that you have the CSV Data Set Recycle on EOF and Stop Thread on EOF values correctly:

• if you plan to iterate over the file more than once you must set Recycle on EOF = True (i.e. instruct jmeter to move back to the top of the CSV file);
• set Stop Thread on EOF = False if you are using a loop controller, Stop Thread on EOF = True if you are using a while controller and want to stop after reading the whole csv dataset;
• in case if you need that each of N threads reads and uses single and unique line from csv-file you have to set Sharing mode: Current thread group for CSV Data Set Config (number of csv-entries should be in this case the same as threads number, or Recycle on EOF? False should be set otherwise);
• in case if you need that each of N threads reads and uses all lines from csv-file you have to set Sharing mode: Current thread for CSV Data Set Config.

Don't forget to look into jmeter.log or use Log Viewer to detect any issues with csv usage.

---

The simplest case is like the following:

Test Group
Number of Threads = 10
    CSV Data Set Config (User Logins)
    Filename: ... (your csv-file should have 10 entries)
    Recycle on EOF = False
    Stop Thread on EOF = True
    Sharing Mode = All threads
    CSV Data Set Config (License Request)
    Filename: ... (your csv-file should have 10 entries)
    Recycle on EOF = False
    Stop Thread on EOF = True
    Sharing Mode = All threads
    Login Sampler
    License request Sampler

This will produce 10 threads each with separate login-entry and license-request-entry from csv's.