This comprehensive guide covers 50 essential Node.js interview questions that every backend developer should know. These questions cover fundamental concepts, event loop, async programming, modules, streams, and production-ready patterns commonly asked in technical interviews.

## Core Concepts

Understanding Node.js core concepts is essential for any backend developer. These questions test your knowledge of the event loop, non-blocking I/O, and how Node.js handles concurrency.

## Event Loop & Async Programming

The event loop is the heart of Node.js. Master these questions to demonstrate your understanding of asynchronous programming, promises, async/await, and callback patterns.

## Modules & Package Management

Node.js uses CommonJS and ES modules for code organization. Understanding module systems, npm, and package management is crucial for building scalable applications.

## Streams & File System

Streams are powerful for handling large data efficiently. These questions cover readable, writable, and transform streams, along with file system operations.

## Production & Best Practices

Production-ready Node.js applications require proper error handling, security practices, performance optimization, and deployment strategies.

Comprehensive collection of 50 essential Node.js interview questions covering event loop, async programming, modules, streams, and backend concepts. Free Node.js, NodeJS, Node JS interview questions with answers. Node.js interview prep guide.

Node.js Interview Practice

What is Node.js and what are its main features?