How to Use JMeter to Test Performance of RESTful APIs?

Representational State Transfer (REST) Uses HTTP Protocol and can be used to access the resources using Uniform Resource Identifier (URI).

JMeter Test Plan Creation
  1. Adding ‘Test Plan’ element: Create the test plan and rename it to ‘REST API Performance Test’, as shown below.image001
  2. Adding ‘Thread Group’ element: You can configure ‘Thread Group’ as per your requirement and simulate concurrent virtual users and time for the load test.image003
  3. Add ‘HTTP Header Manager’ Config Element: This overrides the HTTP request header and decides the header content in the request. You need to add the following content-type:
Content-Type: application/json;charset=UTF-8
  1. Add ‘HTTP Request Defaults’ Config element: Need to configure domain name or IP address and must not include the http://prefix.
  2. Add ‘HTTP Request’ Sampler Element: Go to the ‘Add’ menu and select Sampler->HTTP Request. Configure REST API ‘Path’ and JSON request in ‘Body Data’ and ‘Method’ given below.image005
  3. Add ‘CSV Data Set Config’ element: Jmeter uses CSV data dynamically for storing multiple data objects, update data values, and more.image007
  4. Add ’Response Assertion’ element: This is used to verify the REST API Response.
  5. Add ‘ View Result Tree’ and ‘Aggregated Report’ Listener element: The Listener element stores all results of your HTTP requests in a file and aggregated report is used to analyze the test result.
  6. Add ‘jp@gc-Response Times over Time’ Listener element: The graph shown below highlights the response time during the load time.image009
  7. Run the test plan and view output.

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