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Testing / Apache JMeter Interview questions

What are Pre-Processors and Post-Processors in JMeter?

A Pre-Processor runs some action before its attached sampler executes - commonly used to modify a request's parameters or set up data just before the request is sent.

A Post-Processor runs after its attached sampler executes and typically extracts data from the response - the Regular Expression Extractor, JSON Extractor, and XPath Extractor are all Post-Processors used for this purpose.

Both attach to a specific sampler (or a scope covering several) and only run relative to that sampler's execution, which is what lets a test plan extract a value from one request and immediately have it ready to use in the very next one.

A Pre-Processor runs:
Extractors like the Regular Expression Extractor are classified as:

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