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Find What Is Blocking the Node.js Event Loop

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Self-Hosting & Infra advanced 8 min read $0.01 Updated 2026-10-18

A method for diagnosing a blocked Node.js event loop: measure event loop delay, capture a CPU profile or flame graph, find synchronous JSON, regex, crypto and file calls, and move heavy work to worker threads, streams or a queue.

Requests hang while CPU shows one core pinned. Something synchronous is holding the single JavaScript thread. Measure loop delay, capture a CPU profile and move the work off the main thread.

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#nodejs#event-loop#latency#profiling#performance

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