Glossary term
What is blocking the event loop? Meaning for developers
Running synchronous work for a long time so that timers, requests and I/O callbacks all have to wait.
Learn it properly · Node.js From ZeroLesson 1: The Event Loop: Timers, Promises and the Poll PhaseThe loop phases, microtasks versus macrotasks, process.nextTick, setImmediate, and how a blocked loop freezes everything. Traced and run.