You could run a groovy jsr223 post processor on the sampler with the following 
lines

String responseMessage = prev.getResponseMessage()
prev.setResponseMessage(responseMessage.replace("\n", "\\n"))

-----Original Message-----
From: Dmitri T <[email protected]>
Sent: Friday, March 31, 2023 7:59 AM
To: JMeter Users List <[email protected]>; OUFDOU Anas 
<[email protected]>
Subject: Re: [JMETER] Log on multiple line in CSV

OUFDOU Anas wrote:
> Hello,
>
> When failure message is multiline the CSV jtl file has a line logged
> on multiline, there is no way to replace "\n" by "\\n" in the jtl file
> to have one request by line ?
> image.png
>
>
> --
> Cordialement,
> -------------
> Anas OUFDOU
As of current JMeter stable version 5.5 
<https://www.blazemeter.com/blog/jmeter-5-5> it's not configurable and the only 
way to amend this is changing JMeter source code 
<https://github.com/apache/jmeter/blob/rel/v5.5/src/components/src/main/java/org/apache/jmeter/assertions/ResponseAssertion.java#L573>,
re-compiling the .jar and replacing the original version of the 
ApacheJMeter_components 
<https://mvnrepository.com/artifact/org.apache.jmeter/ApacheJMeter_components>
with the amended one.

Alternatively you can set jmeter.save.saveservice.assertion_results
<https://jmeter.apache.org/usermanual/properties_reference.html#results_file_config>
property to *none* and store assertion results in a separate file using a 
Listener 
<https://jmeter.apache.org/usermanual/properties_reference.html#results_file_config>.


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