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doc: improve AsyncLocalStorage introduction #36946

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5 changes: 5 additions & 0 deletions doc/api/async_hooks.md
Original file line number Diff line number Diff line change
Expand Up @@ -973,6 +973,11 @@ chains. It allows storing data throughout the lifetime of a web request
or any other asynchronous duration. It is similar to thread-local storage
in other languages.

While you can create your own implementation on top of the `async_hooks` module,
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`AsyncLocalStorage` should be preferred as it is a performant and memory safe
implementation that involves significant optimizations that are non-obvious to
implement.

The following example uses `AsyncLocalStorage` to build a simple logger
that assigns IDs to incoming HTTP requests and includes them in messages
logged within each request.
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