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Node.js Interview Questions

Top Node.js interview questions and answers for 2026. Master event loop, Express, streams, authentication, and 20 essential Node.js topics.

Node.js Fundamentals

15 Interview Questions

15

Event Loop

15 Interview Questions

15

Modules System

15 Interview Questions

15

Express.js Basics

15 Interview Questions

15

Middleware

15 Interview Questions

15

REST API Design

15 Interview Questions

15

Error Handling

15 Interview Questions

15

File System

15 Interview Questions

15

Streams & Buffers

15 Interview Questions

15

Authentication & JWT

15 Interview Questions

15

Database Integration

15 Interview Questions

15

WebSockets

15 Interview Questions

15

Cluster & Worker Threads

15 Interview Questions

15

NPM & Package Management

15 Interview Questions

15

Security

15 Interview Questions

15

Caching

15 Interview Questions

15

Microservices

15 Interview Questions

15

Testing

15 Interview Questions

15

Logging & Monitoring

15 Interview Questions

15

Async Patterns

15 Interview Questions

15

About Node.js Interview Preparation

This section covers 20 essential Node.js topics with 15 carefully curated interview questions each. Each topic includes detailed explanations and practical code examples to help you prepare for your next interview. Click on any topic above to start practicing.