Node.js Event Loop Deep Dive

Duration: 30 minsSeptember 5, 2025

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Node.js Event Loop

Node.js executes single-threaded JavaScript code asynchronously. Here are the Event Loop phases:

Timers Phase**: Executes setTimeout/setInterval callbacks.

Pending Callbacks**: Executes I/O errors and system callbacks.

Poll Phase**: Retrieves new I/O events.

Check Phase**: Executes setImmediate callbacks.

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