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Pre-processor Elements

A Pre-Processor element is executed just before the request made by the sampler. If a Pre-processor is attached to a sampler element then it will execute just prior to that sampler element running.

A Pre-processor element is used to modify the settings of a sample request just before it runs, or to update variables that are not extracted from response text.

Following is a list of all Pre-processor elements provided by JMeter:

• JDBC Pre-processor
• JSR223 Pre-processor
• RegEx User Parameters
• BeanShell Pre-processor
• BSF Pre-processor
• HTML Link Parser
• HTTP URL Re-writing Modifier
• HTTP User Parameter Modifier
• User Parameters

The following image shows how you add a Pre-processor element to your test plan.