Will jmeter function FileToString(path) takes dynamic values

Question

Will jmeter function FileToString(path) takes dynamic values.

I need to use around 400 json files as a input. so planning to use FileToString($fileName}) in body data. By providing the filename column in csv. But it seems Jmeter is checking filename as file instead of getting value from csv.

Answer 1

You need to wrap your ${fileName} into __eval() function. As per documentation:

The eval function returns the result of evaluating a string expression.

This allows one to interpolate variable and function references in a string which is stored in a variable.

So you need to change your expression to look like:

${__FileToString(${__eval(${fileName})},,)}

For more information on JMeter functions see How to Use JMeter Functions post series.