Node.js · Middle · Question 72 of 75

What is `AsyncLocalStorage` used for?

✓Correct answer: Keeping per-request data (like a request ID or user) available across awaits and callbacks without passing it through every function
2Sharing memory between worker threads
3Storing data on disk between restarts

Explanation

Call storage.run(context, handler) at the start of a request; any code it calls, sync or async, can read the context with storage.getStore().

Further reading

Node.js API: Asynchronous context tracking ↗

Test yourself

Take the Node.js · Middle quiz: questions and options are shuffled, and you get a review of your mistakes at the end.