We are adding Debug Sampler to be able to inspect our variable. It is easy to extract the data from the response using JSON Extractor Post Processors.Īfter adding the JSON Extractor, we need to set in the configuration the specific data we want to extract. In our example we are trying to fetch alarm information from the IOT system rest service.Īfter executing our test we will get the response to our request from the server below. We then put the JSON payload into the Body Data section of our HTTP Request Sampler. First, we need to add HTTP Header Manager into our HTTP Request in order to set Content-Type as application/json. To perform sending the JSON payload we need a different configuration. This post will show how to do JMeter Load Testing with a JSON payload. JMeter is simply not designed to produce high loads in GUI mode, which means that it will not only freeze - but it will also consume loads of resources and produce unreliable load test results.Currently, the most popular approach for API testing is to send a JSON payload file instead of using data with parameters. Use it only for test recording, development, and debugging. Once you have the test scripts ready, run the test in CLI mode instead of GUI mode. If it exceeds, JMeter will end up spending more time processing the responses and it might affect the response time, thereby skewing the results. Make sure your CPU utilization doesn’t exceed more than 80%. So, it’s good to enable Delay Thread creation until needed option in the ThreadGroup. If you start all of your threads at the same time, you will cause an initial peak rate to your server and you might want to avoid it.Īlso, you might get Non HTTP response code: errors in your tests. Each thread will start 10 (100/10) seconds after the previous thread was begun If 10 threads are used, and the ramp-up period is 100 seconds, then JMeter will take 100 seconds to get all 10 threads up and running. The ramp-up period tells JMeter how long to take to “ramp-up” to the full number of threads chosen. Typically, people start with 200 threads and see how it goes. The number of threads to use depends on many factors and you have to test it for yourself. One solution to this is to define the Test Plan variable in terms of a property, for example LOOPS=$ " Threads And RampUp Period For example, changing the number of threads or loops, or changing a hostname. Often it is useful to be able to re-run the same test with different settings. Performance of JMeter is being constantly improved so always use the latest version of the software available. Performance And Tuning Use Latest Version of JMeter We will look at configuring these options in our performance and tuning section. It also lets you control whether or not JMeter parses HTML files for images and other embedded resources and sends HTTP requests to retrieve them.įollowing the same approach we did for adding a thread group, add HTTP Request Sample and HTTP Header Manager by selecting these options from your thread group -Īdd -> Config Element -> HTTP Header Manager HTTP Request Sampler lets you send an HTTP/HTTPS request to a web server. Since we are going to perform our load test against a REST API, we require HTTP Request Sampler with options to send headers. In the Thread Group GUI, you can control the number of users simulated (number of threads), the ramp up time (how long it takes to start all the threads), the number of times to perform the test, and optionally, a start and stop time for the test. Next, we add a Thread Group to our test plan.Ī Thread Group defines a pool of users that will execute a particular test case against your server. You can change the name of the test plan as required. JMeter GUI will open up with a default test plan. Incase of windows, this can be done by running ApacheJMeter.jar file. Run the JMeter in GUI mode to create the scripts. JMeter is a java based application and hence it requires Java to be available in your machine.Ĭheck if you have Java installed by running below command:įor our guide, we will be looking at the steps to load test a REST API. It can be used to simulate a heavy load on a server, group of servers, network or object to test its strength or to analyze overall performance under different load types. Apache JMeter is a Java application designed to load test functional behavior and measure performance.Īpache JMeter may be used to test performance both on static and dynamic resources, Web dynamic applications.
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