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Node.js Coding Interview Questions

This track preps you for Node.js engineering by teaching modern backend JS, async programming, and API design—exactly what top companies look for in Node.js developers.

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Overview

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Node.js coding interviews go beyond basic JavaScript—they test your ability to write clean server-side code, reason through async operations, and design scalable, production-ready APIs. This track offers hands-on practice with the types of challenges asked in real-world interviews for backend and full-stack roles using Node.js. You’ll work through questions covering core Node.js runtime behavior, middleware logic, async patterns like callbacks and promises, and practical server-side challenges like building authentication flows, handling requests under load, or managing rate limits. Each problem includes structured hints, clean solutions, and step-by-step walkthroughs using JavaScript in a Node.js environment. Whether you're interviewing at a startup or a large tech company, this track helps you prepare for interviews that expect real backend fluency, not just frontend experience.

Node.js coding interviews go beyond basic JavaScript—they test your ability to write clean server-side code, reason through asyn...Show More

WHAT YOU'LL LEARN

How to approach Node.js-style interview questions for backend or full-stack roles.

Practice with async coding challenges, API design, middleware composition, and debugging Node-specific issues.

Exposure to real-world backend problems like authentication, session handling, request throttling, and error management.

Repeated problem-solving using JavaScript in a hands-on Node.js runtime.

Strategies for writing modular code, handling edge cases, and reasoning through performance trade-offs.

Confidence applying for engineering roles that use Node.js in production, from mid-stage startups to cloud-scale platforms.

How to approach Node.js-style interview questions for backend or full-stack roles.

Content

Node.js Coding Interview Questions

47 Lessons

Master the pillars of modern Node.js engineering.

Implement Queue Using Stacks

LFU Cache

Linked List Cycle

Minimum Cuts to Divide a Circle

First Missing Positive

The K Weakest Rows in a Matrix

Sort Colors

Matchsticks to Square

Multiply Strings

Count Days Without Meetings

Remove Nth Node From End of List

Binary Tree Maximum Path Sum

Best Time to Buy and Sell Stock

Maximum Subarray

Longest Palindromic Substring

Word Break

Combination Sum

First Missing Positive

Search in Rotated Sorted Array

Median of Two Sorted Arrays

Implement Queue Using Stacks

Container With Most Water

3Sum

Swapping Nodes in a Linked List

Reverse Nodes In Even Length Groups

Swap Nodes in Pairs

Delete N Nodes After M Nodes of a Linked List

Delete Nodes And Return Forest

Merge Two Sorted Lists

Longest Substring Without Repeating Characters

Valid Parentheses

Two Sum

Developed by MAANG Engineers

Every Educative lesson is designed by a team of ex-MAANG software engineers and PhD computer science educators, and developed in consultation with developers and data scientists working at Meta, Google, and more. Our mission is to get you hands-on with the necessary skills to stay ahead in a constantly changing industry. No video, no fluff. Just interactive, project-based learning with personalized feedback that adapts to your goals and experience.

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Hands-on Learning Powered by AI

See how Educative uses AI to make your learning more immersive than ever before.

Personalized Interview Prep

Skip the LeetCode grind with a custom roadmap that adapts to your goals. Hands-on practice for Coding Interviews, System Design, and more.

Mock Interviews

Test your skills in a simulated interview setting. Receive personalized feedback based on your performance. Available for Coding Interviews, System Design, and more.

AI Prompt

Build prompt engineering skills. Practice implementing AI-informed solutions.

Code Feedback

Evaluate and debug your code with the click of a button. Get real-time feedback on test cases, including time and space complexity of your solutions.

Explain with AI

Select any text within any Educative course, and get an instant explanation — without ever leaving your browser.

AI Code Mentor

AI Code Mentor helps you quickly identify errors in your code, learn from your mistakes, and nudge you in the right direction — just like a 1:1 tutor!

Free Resources

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Frequently Asked Questions

What do Node.js coding interviews usually test?

Real-world async problem-solving: event loop fluency, non-blocking I/O, HTTP APIs, streams/backpressure, error handling, and production concerns (perf, security, observability).

What topics do Node.js interview rounds usually cover?

Employers typically test your understanding of the runtime architecture (including the event loop), package management, asynchronous code patterns, module usage, built-in APIs like fs, error handling, and building HTTP servers.

Are questions about npm and package management common for Node.js interviews?

Absolutely. A common question is how package.json and package-lock.json work in managing dependencies. Expect queries about installing packages, version control, and configuring npm versus yarn workflows.

Will advanced topics like clusters or stream handling come up during Node.js coding interviews?

For experienced roles, yes. You may be asked about implementing worker processes using the cluster module or handling large data efficiently with streams and backpressure.

Is memory usage, debugging, or security ever part of the Node.js coding interview?

Yes. You may face questions about writing secure Node.js code, implementing global error handlers, avoiding memory leaks, or debugging crashes using tools like the built-in inspector or logging.

How does the Node.js event loop actually work in interviews?

Expect ordering puzzles (timers vs I/O callbacks vs setImmediate, microtasks like Promise.then/queueMicrotask, and process.nextTick). Be ready to explain why a given snippet logs in a specific order.

What are common Node.js security interview questions?

SSRF and path traversal defenses, prototype pollution, safe templating, CORS/CSRF basics (cookie vs token auth), helmet-style headers, and sanitizing user input.

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