JavaScript Node.js Fundamentals - Practice Questions 2026
Course Description
Mastering JavaScript and Node.js is a critical milestone for any modern web developer. This course is specifically designed to bridge the gap between theoretical knowledge and practical application through a comprehensive set of practice exams. Whether you are preparing for a technical interview or looking to solidify your backend development skills, these practice questions provide the rigorous training necessary to succeed.
Why Serious Learners Choose These Practice Exams
Serious learners understand that watching tutorials is only the first step. True mastery comes from testing your knowledge under pressure. Our practice exams are meticulously crafted to mimic real-world development challenges and technical interview environments. Unlike standard quizzes, these questions force you to analyze code snippets, predict output, and understand the underlying mechanics of the V8 engine and the Node.js runtime. By engaging with this question bank, you ensure that your knowledge is deep, functional, and ready for production environments.
Course Structure
This course is organized into six distinct levels of difficulty to ensure a smooth but challenging learning curve:
Basics / Foundations: Focuses on the bedrock of JavaScript, including data types, variables (let, const, var), basic operators, and control flow. Understanding these is essential before moving to server-side logic.
Core Concepts: Covers the fundamental building blocks of Node.js, such as the module system (CommonJS vs. ES Modules), the File System (FS) module, and the global objects available in the Node environment.
Intermediate Concepts: Dives deeper into asynchronous programming. You will be tested on Promises, async/await, and the Event Emitter pattern, which are central to how Node.js handles non-blocking I/O.
Advanced Concepts: Challenges your understanding of the Node.js Event Loop, Buffer management, Streams, and memory optimization. This section is designed for those looking to build high-performance applications.
Real-world Scenarios: Shifts from syntax to logic. These questions present architectural problems, such as handling API rate limits, secure password hashing, and debugging middleware in an Express.js environment.
Mixed Revision / Final Test: A comprehensive cumulative exam that pulls from all previous sections. This timed test simulates a professional certification or job assessment environment.
Sample Questions
Question 1
What is the output of the following code snippet?
JavaScript
console. log('Start');
setTimeout(() => {
console. log('Timeout');
}, 0);
Promise. resolve(). then(() => {
console. log('Promise');
});
console. log('End');
Option 1: Start, Timeout, Promise, End
Option 2: Start, End, Timeout, Promise
Option 3: Start, End, Promise, Timeout
Option 4: Promise, Start, End, Timeout
Option 5: Start, Promise, End, Timeout
Correct Answer: Option 3
Correct Answer Explanation: JavaScript executes synchronous code first. "Start" and "End" are logged immediately. Then, the Event Loop prioritizes the Microtask Queue (where Promises reside) over the Macrotask Queue (where setTimeout resides). Therefore, "Promise" is logged before "Timeout".
Wrong Answers Explanation:
Option 1: Incorrect because it ignores the asynchronous nature of setTimeout and Promises.
Option 2: Incorrect because it places the Macrotask (Timeout) before the Microtask (Promise).
Option 4: Incorrect because "Promise" is an asynchronous callback and cannot execute before synchronous "Start".
Option 5: Incorrect because "Promise" is asynchronous and must wait until the main execution stack (including "End") is clear.
Question 2
In Node.js, which module is used to handle file paths across different operating systems to ensure compatibility?
Option 1: fs
Option 2: os
Option 3: url
Option 4: path
Option 5: http
Correct Answer: Option 4
Correct Answer Explanation: The 'path' module provides utilities for working with file and directory paths. It automatically handles differences between Windows (backslash) and POSIX (slash) separators.
Wrong Answers Explanation:
Option 1: The 'fs' module is for interacting with the file system (reading/writing files), not for path string manipulation.
Option 2: The 'os' module provides information about the operating system's CPU, memory, and uptime, but not path formatting.
Option 3: The 'url' module is used for URL resolution and parsing, not local file system paths.
Option 5: The 'http' module is used for creating web servers and making requests.
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