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Node.jsv20+ LTS

Interview Preparation & Deep Dives

0% read0 of 58 topics

Core Node.js0/16

Event Loop10m Microtasks vs Macrotasks: Predicting Output Order Single-Threaded Model and libuv Thread Pool10 min Blocking vs Non-Blocking I/O CommonJS vs ES Modules, Module Caching Streams, Piping, and Backpressure

Buffers and EncodingSoon

EventEmitter and Custom EventsSoon

Core Modules: fs, path, os, httpSoon

The process Object: argv, env, Exit Codes, SignalsSoon

child_process: spawn, exec, forkSoon

crypto Module: Hashing and Random TokensSoon

Global Error Handling: uncaughtException and unhandledRejection

Graceful Shutdown on SIGTERMSoon

Recent Node Features: fetch, AbortController, --watch, LTS CycleSoon

Async JavaScript0/5

Callbacks → Promises → async/await Promise.all, allSettled, race, any Error Handling in Async Code Closures, this, Hoisting, and Scope Parallel vs Sequential Async Tasks, Limiting Concurrency

Express & APIs0/10

Middleware Flow, next(), and Error-Handling Middleware Routing and Request Validation (Joi/Zod)REST Design, Status Codes, and Idempotency JWT Auth, Sessions, Cookies, and Refresh Tokens

CORS, Rate Limiting, and HelmetSoon

File Uploads with Multer and Large Files via Streams

Pagination, Filtering, and Sorting in APIsSoon

API VersioningSoon

Centralized Error Classes and Consistent Error ResponsesSoon

GraphQL Basics vs RESTSoon

Real-time & Messaging0/4

WebSockets and Socket.ioSoon

Server-Sent Events vs WebSockets vs PollingSoon

Message Queues and Background Jobs (BullMQ, RabbitMQ, Kafka Basics)Soon

Cron Jobs and Scheduled TasksSoon

Performance & Scaling0/6

Multithreading in Node.js12m

Caching with Redis: Cache-Aside, TTL, InvalidationSoon

Memory Leaks and ProfilingSoon

PM2 and Load Balancing BasicsSoon

Compression, Response Caching Headers, and ETagsSoon

Microservices vs Monolith, Inter-Service CommunicationSoon

Security0/5

SQL/NoSQL Injection, XSS, and CSRFSoon

Password Hashing (bcrypt) and Secrets in Env VariablesSoon

Input Sanitization, HTTPS, and Secure Cookie FlagsSoon

OAuth 2.0 and Social Login FlowSoon

Role-Based Access Control (RBAC)Soon

Project & Deployment0/6

Folder Structure and Layered ArchitectureSoon

Config Management with .env and Per-Environment ConfigSoon

Logging with Winston and PinoSoon

npm, Semantic Versioning, and package-lock.jsonSoon

Docker Basics and CI/CD OverviewSoon

TypeScript with NodeSoon

Practical Questions0/6

Predict the Output of an Event-Loop SnippetSoon

Build a CRUD API with Auth and PaginationSoon

Implement a Custom Promise.all or DebounceSoon

Handle a Large File Upload with StreamsSoon

Design a Simple Rate LimiterSoon

Walk Through a Bug or Performance Issue You FixedSoon

Buffers and Encoding

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