JMeter: How can I get JSON value? - jmeter

I want to test value of numFound and needs to be non zero. I have following
and I have tried following
I get following errors

I think the case of letters in variable name is important: $..numFound instead of $..numfound. Also remember that JSON path returns a valid JSON array, so it will look like this: [148].

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how to extract the 'sid' value from below mention json as $.sid expression is not working here as zero is appeared at start of the json response

how to extract the 'sid' value from below mention json as $.sid expression is not working here as zero is appeared at start of the json response.
Json Response:
0{"sid":"gR9Noj6V939hTbpXAARp","upgrades":["websocket"],"pingTimeout":20000,"pingInterval":25000}
enter image description here
You need to either remove the framing delimiter characters using __strReplace() function or __groovy() function from the response or just go for the Regular Expression Extractor
The relevant Regular Expression would be something like:
"sid"?\s*:?\s*"(\w+)"

How to work with base64 encoded params that include dynamic variables in Jmeter

I am working on a performance script in Jmeter that contains a number of http requests. One of the parameters I pass in my request will always be formatted as follows:
{"a":"transition9","ap":"203867"}
Everything about the above remains constant with the exception of "ap". I need to pull "ap" from regular expression extractor, which I can do.
So at the end of the day the above will actually look something like this.
{"a":"transition9","ap":"${regexExtractedValue}"}
Here is the really tricky part. If I can achieve the above, I then need to base64 encode the value, which I know can be done using ${__base64Encode(test string)}. See https://jmeter-plugins.org/wiki/Functions/#base64Encodesupfont-color-gray-size-1-since-1-2-0-font-sup.
I have tried a number of approaches, which mainly have involved splitting up the hardcoded values and trying to combine them with the dynamic values, but the comma seems to throw it off. An example of something I have tried.
prefix = eyJhIjoidHJhbnNpdGlvbjkiLCJhcCI6Ij
ap = ${__base64Encode(203867"})
Then you would combine the 2 and the value being passed into the param would look something like this
{"stuff":"thing","__Action":"${prefix}${app}","__Scroll":"base64:MA=="}
This yields strange results. Is there a way to get what I need here?
In the parameter value I used this format:
${prefix}${__base64Encode("${post}"})}

Not able to read session id from response in jmeter

i want to fetch "chat_session_id": 8216, from response data and apply regular expression extractor
"chat_session_id": (.+?)
but it only fetches 8 instead of 8216
You did correctly, the mistake is you need to add comma to your regular expression
Actual value: "chat_session_id": 8216,
Regx: "chat_session_id": (.+?),
Try amending your regular expression to look like:
"chat_session_id": (\d+)
This one will match any number following the chat_session_id: so it should work as it evidenced by View Results Tree listener output:
In general, given you are getting the response in JSON format it would make more sense to use JSON Extractor which is designed for working with JSON data type. The relevant JSON Path Expression would be as simple as:
$..chat_session_id

Removing brackets in my API request using Ruby?

I have an API script written in ruby that is returning data. The variable being used to return data is being passed includes brackets and quotes ["likeso"] resulting in no data being returned because it is expecting it to be only: likeso
Any ideas how to solve this problem?
I think when you parse the json string you will get only likeso
It's showing when you print the output.

Request::getQueryString() without some parameters

I am using the following code to append the query strings with two links. But I want to exclude the page parameter of pagination from the query string.
<li>Teachers</li>
<li>Courses</li>
What is the way to do it? I tried the following code but it generates error.
<li>Teachers</li>
<li>Courses</li>
Well getQueryString() just returns a string. Instead you can use Request::except() directly and then call http_build_query() to generate the query string:
<li>Teachers</li>
Note that if you have POST values, those will be included too. If you want to avoid that do this:
<li>Teachers</li>

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