Top NodeJS Interview Questions and Answers asking in MNC and all other companies for Freshers and Experienced
”
StoryLine:
“Each interview will give different experience. Whenever we prepare for any technical interviews, we will cover various topics from basic concepts to tricky questions. Enrichvia will share the experience from many developers who faced technical interview in NodeJS.”
Content:
NodeJS Roadmap
➤ Phase 1 – JavaScript Basics
:
– Lexical Structure
– Expressions
– Data Types
– Classes
– Variables
– Functions
– this Keyword
– Arrow Functions
– Loops
– Scopes
– Arrays
– Template Literals
:
– Callbacks
– Timers
– Promises
– Async & Await
:
– Closures
– The Event Loop
➤ Phase 2 – Core NodeJS Concepts
:
– Global Objects in NodeJS (__dirname, __filename, module)
– Modules (CommonJS Modules and ES6 Modules import/export)
– NPM (Node Package Manager)
() :
– Reading/Writing Files
– File Streams
– Asynchronous vs. Synchronous File Operations
& :
– Custom events
– Handling asynchronous events
:
– Creating an HTTP server (Handling req and res)
& :
– Buffer: Handling binary data
– Streams: Readable, Writable, Duplex, and Transform streams
– Stream handling (piping, chunking)
➤ Phase 3 – Advanced NodeJS Concepts
:
– Routing
– Middleware
– Handling Req, Res & Error
– Serving Static Files
– Template Engines (e.g., Pug, EJS)
– RESTful APIs
:
– MongoDB with Mongoose (CRUD operations, Schemas & Models)
– SQL (MySQL, PostgreSQL)
– Using Sequelize
– Redis
➤ Phase 4 – Real-time Applications
.:
– Real-time data communication
– :
– Understanding event-driven development
➤ Phase 5 – Security Practices
– Environment Variables & Configuration (.env)
– Input Validation (Joi)
– Preventing Common Vulnerabilities (XSS, CSRF, SQL Injection)
– Authentication & Authorization
– JWT
– OAuth (Session-based authentication)
– Data Encryption
– Helmet for securing HTTP headers
➤ Phase 6 – Deployment & Production
:
– PM2 for managing Node processes
:
– Docker: Containerizing NodeJS applications
– Docker Compose for multi-container applications
➤ Phase 7 – Building Scalable Applications
:
– Building modular applications
– Using message brokers (e.g., RabbitMQ, Kafka)
Conclusion:
NodeJS developers have huge market all over world. They can enrich web with event programming in all sectors based on client needs. Becoming NodeJS should have good knowledge in JavaScript.
