JMeter tutorial 17 - How to use Functions and Variables in JMeter

This is the seventeenth video of JMeter Tutorial series which covers how to use functions and variables in JMeter
Learning:
Functions:
• Values that can populate fields of any sampler or other element in a test tree
• Syntax: ${__functionName(par1, par2, par3…..)}, ${__functionName}
• Functions are case sensitive
Variables:
• Container to store values
• Syntax: ${variableName}
• Variables are local to a thread group
Function examples:
• Log - to log messages
Example: ${__log(hello Jmeter)}
• BeanShell - It evaluates the script passed to it and returns the result
Example: ${__BeanShell(1234*678,)} , ${__BeanShell(234*67,variable1)}
• Time - returns current time in various formats
Example: ${__time(dd/MM/yyyy,date)}
• Counter - Generates a new number each time it is called, starting from 1, and it gets incremented every time by +1
Example: ${__counter(,)}
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[@abridgetool]

How should I declare global variable which can be used between multiple thread groups? Thanks.

[@TheBharat234]

How to use functions in the text file.I am using a csv to read test data and want to update some values in the text file using the functiins

[@tulasiraochintala4046]

Hi. How to send content-Length in jmeter headers. its dynamically changing the value for each request

[@belalakhtar]

It increments value by 2 as like 2,4, 6, 8... not as 1,2,3,4. I am using the same as is ${__counter(,)} function. What could be the possible cause that it increment by 2 in place of 1? Support please.

[@vikasviky8759]

I need a help!
How can I extract JSON value from the encrypted value (eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.==) This is in Base64 encrypted format.
After Decode.
is there any function or Javascript library?

[@kirankumaralam]

How can we pass the form parameters Jmeter...I have viewed all your videos.. did not find

[@MultiDpz]

How to pass value from one thread to another ? ( how to set global variable ) ?

[@MrVijayvideo]

Good explanation

[@qualityassurancelab7764]

Thank you!

[@deeparajan3750]

Can you explain the random function and how to create Random values from csv file ....like when we need different values for sign up - userid and password. Can you please create a video on this

[@qualityassurancelab7764]

Jmeter Random function has the format - ${__Random(minValue,MaxVal)}. The random function returns a random number that lies between the given min and max values.
To create Random numbers from CSV file, add multiple random numbers in CSV file and call them in JMeter script using CSV dataset config

[@shirshN]

Hi, I'm using having http request under which i have one jdbc preprocessor. This preprocessor would run a query and will fetch a field which can either be a integer or a null value. Under jdbc preprocessor I have variable name as abc. Now i want to pass value of this ${abc} variable to http request json field say "pqr" : ${abc} . So when ${abc} holds intger value it works fine but if it has null value it returns ${abc} instead of null . How to make this work, would you please assist. As my requirement is also to pass null

[@qualityassurancelab7764]

Hi, in this case add the HTTP sampler under if controller as explained below:
Add If controller and provide the condition ${abc} ==null. Inside this If Controller, add HTTP sampler and provide json field as "pqr" : null
Add one more if controller and provide the condition ${abc} !=null. Inside this If Controller, add HTTP sampler and provide json field as "pqr" : ${abc}

[@shirshN]

@@qualityassurancelab7764 thanks so much for your response. I will definitely check this.

[@kranthikumar2367]

Can you tell me how to use utc date and time zone in jmeter

[@qualityassurancelab7764]

You can use __groovy() function in JMeter to get the UTC time zone.
${__groovy(new Date().format("yyyy-MM-dd'T'hh:mm:ss"\, TimeZone.getTimeZone('UTC')),)}

[@kranthikumar2367]

Thanks for the reply ..can you please help me how to get this format 2020-04-18T02:00:00Z