Programming

Node.js Fundamentals - Programming

This Node.js Fundamentals test evaluates your master the core concepts and runtime environment that make Node.js unique as a JavaScript platform.

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Questions

Multiple choice with one correct answer

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Expert-reviewed questions with clear answer keys

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Node.js Fundamentals
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About This Assessment

This test evaluates your foundational understanding of Node.js architecture, the event loop, and core runtime concepts.

This assessment measures your comprehension of what Node.js is, how it differs from browser JavaScript, and the fundamental concepts that enable server-side development. You'll demonstrate understanding of the event-driven, non-blocking architecture that defines Node.js.

Questions test your grasp of the event loop, asynchronous execution model, and the Node.js runtime environment. You'll answer conceptual questions about how Node.js processes code and handles multiple operations simultaneously.

Review your results to ensure you have a solid foundation in Node.js fundamentals before advancing to more complex topics. Use your score to guide focused study on core concepts you may need to strengthen.

What This Test Covers

Modules and require

How CommonJS loads code with require and module.exports, the difference from ES module import syntax, and how Node resolves file and package paths.

The Event Loop

How Node runs single-threaded non-blocking JavaScript, queuing callbacks and timers so I/O work does not stall the main thread.

Core Modules

Built-in modules like fs for files, path for paths, http for servers, and os for system info, all available without installing anything.

npm and package.json

Installing dependencies with npm, the role of package.json and package-lock.json, and how node_modules stores installed packages locally.

Sample Questions

A few real questions from this test, with answers and explanations. Take the full test above for the complete set.

In CommonJS, which function is used to load another module in Node.js?

Answer: require()

CommonJS uses the synchronous require() function to load modules. The ES module import syntax is available in .mjs files or when type is set to module in package.json.

In a CommonJS module, how do you expose a value so other files can require it?

Answer: Assign it to module.exports

A CommonJS module exposes values by assigning to module.exports (or properties of the exports object). Whatever module.exports references becomes the value returned by require().

Which variable holds the absolute path of the directory containing the current CommonJS module?

Answer: __dirname

__dirname is the directory name of the current module, while __filename is the full path including the file name. process.cwd() returns the working directory where Node was launched, which can differ.

How do you read command-line arguments passed to a Node.js script?

Answer: process.argv

process.argv is an array where index 0 is the node executable, index 1 is the script path, and the remaining elements are the user-supplied arguments.

Which core module provides functions like readFile and writeFile for working with files?

Answer: fs

The built-in fs module provides file system operations such as fs.readFile, fs.writeFile, and their synchronous and promise-based variants.

Frequently Asked Questions

Find answers to common questions about this assessment

The event loop is the mechanism that lets single-threaded Node handle many operations without blocking. It runs your synchronous code, then processes queued callbacks from timers, I/O, and promises in phases. Slow work like reading a file is offloaded, and its callback fires later when the result is ready.

require is the CommonJS way to load modules and runs synchronously at any point in code. import is ES module syntax, is statically analyzed, and is hoisted to the top. Node supports both, but import requires either .mjs files or type module set in package.json.

package.json is the manifest for a Node project. It lists metadata like name and version, declares dependencies and their version ranges, and defines scripts you run with npm run. It lets anyone install the exact libraries your project needs with a single npm install command.

Your JavaScript runs on one main thread, but Node is not fully single-threaded. Behind the scenes libuv uses a thread pool for tasks like file system work and some crypto. This lets one thread handle your logic while heavier operations run in the background.

Scores are based on the number of correct answers divided by total questions, with a breakdown by topic category.

Yes, questions are randomly selected and ordered from our question bank to ensure each attempt is unique.

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There is no pass/fail threshold. The test measures your knowledge level and provides detailed feedback for improvement.

For knowledge tests, we recommend answering without external help to get an accurate assessment. Practice exercises are designed for learning, so references are acceptable.

Our questions are written for structured educational practice and can give a useful snapshot of your current knowledge in the tested topics.

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