how to set multiple JSON request from the file in JMeter

Question

I m newbie in JMeter. I am trying to send multiple JSON request using Jmeter where.

1. Login (getToken) Request - I m loading a csv file for username and password

   { "Username": "${Username}", "Password": "${Password}",

   }

Response

{"Status":"Success","HttpStatus":200,"Data":{"token_type":"Bearer","token":"eITWDFHzN-awdaJy5SQ","name":"JMeter","u_ID":"6934FF18C130"}}

2. AddQuery(Using #1 's response token and another parameter called U_ID )

for this I have request like this

 {

"Comment":"TEST COMMENT",
"Type":"TEST",
"DATE":"04-02-2020",   
"ColA":"",
"ColB":"",
"ColC":"",
"ColD":"",
"ColE":"",
 "User":"${name}"
} 

Here no of columns are diffrent. So I want to set up a plan where i want to read request JSON from the file. I tried with storing diffrent request in CSV file but JMeter is not able to read it.

I found if you storethe request in CSV file then it is adding extra " " like below.

JMeter request

POST data:
""{""Comment"":""TEST COMMENT"""

[no cookies]

Which is best way to handle/ ready JSON request from the file

Answer 1

Use __eval() and __FileToString() functions combination directly in "Body Data" tab of the HTTP Request sampler like:

${__eval(${__FileToString(/path/to/your/file.json,,)})}

where:

• __FileToString() - loads file from disk
• eval() - evaluates eventual JMeter Functions and Variables to resolve their values, ie ${name}

Demo:

More information: Here's What to Do to Combine Multiple JMeter Variables