Updated March 30, 2023
Definition of JMeter User-Defined Variables
JMeter gives the various properties to the client, in which that variable is one of the properties that are given by the JMeter. Fundamentally, factors are utilized to string and this is an extremely essential property of JMeter that can be applied to all strings. Assuming we want to call values from some other sampler or some other component around then we can utilize the JMeter work with the variable. We can make factors according to our necessity that we call client characterized factors, as well as JMeter, which gives the factor to the client to finish their execution.
What is JMeter user-defined variables?
In our test plan, there is something that you really want to use in the entire arrangement, for example, the Server Name or IP, the Port Number, or the Protocol of HTTP Request. Envision your test plan contains 100 HTTP Requests and has similar data as above. Then, at that point, on a pleasant day, the dev group moves the climate to somewhere else, which new Server Name, new Port; and so on furthermore you should alter each of the 100 HTTP Requests. Gee, that is bad, correct. We want to be able to characterize some broad data of the Test Plan like that. Also, the most effective way to do this is User Define Variable.
In JMeter, the User Defined Variables config component is utilized to proclaim and characterize the factors which are utilized in the JMeter script. A few factors like application URL, port, and so on are for the most part characterized in the User Defined Variable component. In the event that you want to characterize Global factors, add this component under the Test Plan.
JMeter string factors will have not been completely set up when the capacities are handled, so factor names passed as boundaries won’t be set up and user-defined variables references won’t work. Thus, split () and regex() and the user-defined variable assessment capacities won’t work. The thread capacity won’t work and it doesn’t seem OK at the test plan level.
Simply consider one situation where we have various HTTP demands that have various boundaries set, however similar URLs. We realize that later on, to alter the URL. In this situation, we should alter each URL, and assuming we have many of them, that will be blunder inclined and time escalated. For this situation, utilizing User Defined Variables (UDV) is a superior methodology. This usefulness permits changing boundaries in various spots of the test plan.
How to use user-defined variables?
Now let’s see how we can use user-defined variables in JMeter as follows. First, we need to create a Test Plan in JMeter as shown in the following screenshot.
Now we need to add the user-defined variable that is present inside the Config Element tab as shown in the following screenshot as follows.
Inside the user-defined variable, we have a different option as shown in the following screenshot as follows.
- Name: It is nothing but the variable name which we can use in another place, the syntax of the name as below.
Syntax
${specified variable name}- Value: It’s the value relating to the variable in the Name section. The entire ${specified variable name} will then, at that point, be supplanted by the string in the “Worth” segment.
- Description: Here we can provide the description of the user-defined variable.
In the next step we need to add the sampler, here we added an HTTP request but before that, we also need to add the Thread Group as shown in the following screenshot as follows.
Here we assign the user-defined variable that is Home_variable as shown in the following screenshot as follows.
Now add the listener to view the result as shown in the following screenshot as follows.
Now save the Test Plan and run it, after execution of the Test Plan we can see the output in the following screenshot as follows.
JMeter user-defined variables Tips
Now let’s see different tips that are useful while using user-defined variables as follows.
Envision a situation where you have various HTTP demands that have various boundaries set, yet similar URLs. You realize that later on, you might need to alter the URL. For this situation, you should alter each URL, and assuming you have many of them, that will be blunder inclined and time concentrated.
In this situation, utilizing User Defined Variables (UDV) is a superior methodology. This usefulness permits changing boundaries in various spots of the test plan. So we need to follow the following tips.
1. All the UDV components in a test plan – regardless of where they are – are handled toward the beginning. For straightforwardness, it is recommended that UDVs are put uniquely toward the beginning of a Thread Group (or maybe under the Test Plan itself). Subsequently, UAVs can’t reference factors that are characterized as a feature of a trial, e.g in a Post-Processor.
2. UDVs ought not to be utilized with capacities that create various outcomes each time they are called. Just the consequence of the primary capacity call will be saved in the variable.
3. UDVs are handled according to the pattern in which they show up in the Plan, start to finish. If a runtime component, for example, a User Parameters Pre-Processor or Regular Expression Extractor characterizes a variable with a similar name as one of the UDV factors, then, at that point, this will supplant the underlying worth, and any remaining test components in the string will see the refreshed worth. In another word, assuming the factors are copied, maybe because of Processor, or Regular Expression Extractor, or other UDVs, then, at that point, the last worth will be utilized, and overwrite the underlying worth.
Conclusion
We hope from this article you learn more about JMeter user-defined variables. From the above article, we have taken in the essential idea of JMeter user-defined variables and we also see the representation and example of the JMeter user-defined variables. From this article, we learned how and when we use the JMeter user-defined variables.
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