JMeter- how to set send and receiving data in JSON file - by WebSocket

Question

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?

Answer 1

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:

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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)