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I have a back end application (only back end) which sends data to customers by WebSocket.
I testing this application using JMeter. In Jmeter I added plugin WebSocket Sampler by Peter..
Previously I am sending this data to customers by Postman.
In my Json file incluge data about event, in which customers can subscribe. I have one question: How can I do it, that data, which is send in postman (in json file) will be send in JMeter?

Is it correctly way to read my json file in Jmeter?
If not: Why not and how I can improve this?

2. How I can the best to process data - to variable from my json file?

There is __FileToString() function, you can kill two birds with one with it, to wit:

1. Read a file from the file system


2. Store file contents into a JMeter Variable

For example the following expression:

$__FileToString(file.json,,myVar)

will read file.json from JMeter's "bin" folder and store its contents into $myVar JMeter Variable:

If you have multiple JSON files and want multiple JMeter threads to send different files - the easiest way is going for Directory Listing Config plugin (can be installed using JMeter Plugins Manager)

in attachmnent I show, what I set this

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what is wrong and how is the easiest way to improve this?
I'm not understand exactly, how I can add $__FileToString(file.json,,myVar) and variable myVar,
and how exactly must be set FileToString and myVar in Thread group, as what of type test plan?
how improve exactly?

OK I set this, and in View Result Three in ERR in Response Body is correctly return body json, so I dont know, why is **ERR* name
It is correctly? and if not, why is wrong and how I can improve this?