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How to add a task to microtask queue with queueMicrotask

What is queueMicrotask

queueMicrotask() is a built-in JavaScript function that adds a task to the microtask queue.

Microtasks execute immediately after the current call stack completes and before the next macrotask (e.g., setTimeout, setInterval, event handler).

Syntax

javascript
queueMicrotask(() => { // Your code });

Usage Example

javascript
console.log("Start"); setTimeout(() => { console.log("Timeout"); }, 0); queueMicrotask(() => { console.log("Microtask IT Lead"); }); console.log("End");

What Will Output?

bash
Start End Microtask IT Lead Timeout

queueMicrotask always executes before setTimeout, even if the timer delay is 0.

Where queueMicrotask is Used

  • Inside libraries and frameworks for queue optimization (React, Vue, Zone.js)
  • For state updates after current call but before render
  • For predictable execution order

Tip:

Use queueMicrotask if you want to execute a task asynchronously but immediately after the current operation — faster than setTimeout(...).

Conclusion

  • queueMicrotask() is a way to add a task to microtasks that will execute after the current stack but before macrotasks.
  • It's a fast and reliable way to defer code execution without waiting for the next render or event.
  • Used for precise control of execution order in asynchronous operations.

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