Node.js Timers Guide

Node.js provides several timer functions for scheduling code execution. Here's how they work.

Best Practices#

Choosing Timers:
✓ setTimeout for delayed execution
✓ setInterval for repeated tasks
✓ setImmediate after I/O
✓ process.nextTick for immediate async

Memory Management:
✓ Always clear timers when done
✓ Use unref() for non-critical timers
✓ Store timer IDs for cleanup
✓ Clear on process exit

Patterns:
✓ Use timer promises in Node 16+
✓ Implement debounce/throttle
✓ Add timeout to async operations
✓ Yield with setImmediate in loops

Avoid:
✗ Recursive process.nextTick
✗ Relying on timer order
✗ Forgetting to clear intervals
✗ Assuming timer precision

Node.js timers provide flexible scheduling options. Use setTimeout for delays, setInterval for repetition, setImmediate for post-I/O execution, and process.nextTick for immediate callbacks. The timer promises API in Node.js 16+ makes async timer code cleaner. Always clean up timers to prevent memory leaks.

Node.js Timers Guide

setTimeout#

setInterval#

setImmediate#

process.nextTick#

Timer Promises (Node.js 16+)#

Event Loop Phases#

Patterns#

Timer References#

Scheduling Patterns#

Common Mistakes#

Best Practices#

Conclusion#

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