Generate and pass API token to subsequent request in JMETER

Step 1: Open JMeter -> Add Thread Group to the Test Plan -> Add Http request sampler

Step 2: Select HTTP Request sampler and change the name if you wish to.

Step 3: In the Basic tab Enter following information:

Protocol – http/https

Server Name or IP – Enter server name/IP to generate the token. e.g

HTTP Request – POST

Path: Enter the query parameter to generate the token. eg. oauth2/token

Step 4: In the parameter tab enter the following information:

Name: grant_type Value: client_credentials

Name: client_id Value: Enter client ID

Name: client_secret Value: Enter client secret

Step 5: Add Post Processor JSON Extractor in the Thread group.

Step 6: Enter following information:

Names of created variables: accessToken

JSON Path expression: access_token

Step 7: Add BeanShell Assertion in the thread group and add following code in the script section.

${__setProperty(bearerTokenforanotherThread, ${accessToken})};

Step 8: Add another thread group to add request which will be using the token generated in above steps.

Step 9: Add BeanShell PreProcessor in the Thread to store the token value and add following code in script section of BeanShell PreProcessor

String bearerToken = ${__property(bearerTokenforanotherThread)}.

Step 10: Add HttpRequest in the thread group and enter following information.

Protocol: http/https

Server Name or IP: Name or IP of API server


Path: URI Path of the request

Step 11: Select http request -> right click ->Add->config element->HTTP Header Manager
Step 12: Add following code in http header manager:
Name: Authorization
Value: Bearer ${__property(bearerTokenforanotherThread)

Step 13: Run the plan. Token should be generated and pass to the subsequent request in next thread group.

Web application Performance Testing using Jmeter

  • Go to bin folder of apache-jmeter
  • Launch jmeter by clicking jmeter.bat
  • In Jmeter, Go to File -> Templates
  • Select Recording from the Select Template drop down.
  • Click Create and enter application url in hostToRecord text box.
  • Click Create. It will create the performance test plan.
  • To start the recording, select “HTTP(S) Test Script Recorder”
  • After clicking the start button, Root CA certificate will be generated.
  • This certificate is valid only for 7 days. Start the browser and import the certificate.
  • Go to IE->Internet Options->Contet->Certificates-Import
  • Once the certificate imported successfully, change the IE LAN settings to localhost with the port mentioned in JMeter recorder global settings.
  • Once the above setting is done. Enter the application url in IE and start recording the performance scenario.
  • Once the recording completed, this is how the Jmeter will look.
  • Add summary report and aggregate report in the plan to get the performance results.
  • Right click on Test Plan -> Add -> Listener -> Summary Report/Aggregate Report
  • Performance Test Plan is ready to run.
  • Select Thread Group. Change the Thread number as per the requirement and click green button to start the performance testing.
  • Once the execution finished, summary and aggregate report will be generated.