Node.js FAQ: Top Questions
43. What is the Node.js event loop microtask queue?
The
microtask queue
in Node.js processes high-priority tasks (e.g., Promises,
queueMicrotask
) before other event loop phases, ensuring minimal delay for critical async operations.
- Execution: After each event loop phase, before timers or I/O.
-
Tasks:
Promise resolutions,
queueMicrotaskcallbacks. -
Priority:
Higher than
nextTickor macro tasks. - Use Case: Fine-grained async control.