Answer
async_hooks track async operation lifecycles. Used for logging, request tracing, correlation IDs, and context propagation.
Quick Answer
async_hooks is a Node.js module that tracks async resource lifecycle — creation, before callback, after callback, destroy. It's the foundation for AsyncLocalStorage. Internally, each async operation gets an async ID; async_hooks fires events at each lifecycle stage. Used by APM tools to trace request context across async boundaries automatically.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ