Crack Your Next.js Interview: 100+ Essential Questions and Answers
Unlock your full potential in mastering Next.js with Next.js Interview Guide: 100+ Questions and Answers to Succeed 📘. Whether you're just starting out as a developer or you're an experienced professional looking to take your skills to the next level, this comprehensive e-book is designed to help you ace Next.js interviews and become a confident, job-ready developer. The guide covers a wide range of Next.js topics, ensuring you're well-prepared for any question that might come your way.This e-book explores key concepts like Server-Side Rendering (SSR) 🌍, Static Site Generation (SSG) 📄, Incremental Static Regeneration (ISR) ⏳, App Router 🛤️, Data Fetching 🔄, and much more. Each topic is explained thoroughly, offering real-world examples and detailed answers to the most commonly asked interview questions. In addition to answering questions, the guide highlights best practices ✅ for optimizing your Next.js applications, improving performance ⚡, and ensuring scalability 🌐. With Next.js continuously evolving, we also dive deep into cutting-edge features like React 18, Concurrent Rendering, and Suspense 🔄. This makes sure you're always up-to-date with the latest advancements, equipping you with the knowledge that interviewers are looking for.What sets this guide apart is its practical approach. It doesn’t just cover theory but provides actionable insights that you can apply directly to your projects. Security 🔒, SEO optimization 🌐, and deployment practices 🖥️ are also explored in detail to ensure you're prepared for the full development lifecycle.Whether you're preparing for a technical interview at a top tech company or seeking to build more efficient, scalable applications, this guide will help you sharpen your Next.js skills and stand out from the competition. By the end of this book, you’ll be ready to tackle any Next.js interview question with confidence, from fundamental concepts to expert-level challenges.Equip yourself with the knowledge to excel as a Next.js developer 🚀 and confidently step into your next career opportunity!
probirsarkar.gumroad.com
Node.js remains a cornerstone of backend development in 2025, with a rich ecosystem of libraries and tools that streamline authentication, validation, database access, and local development. I am going to highlight my favorite packages for Node.js backend developers.
Authentication: Secure and Flexible
Authentication is foundational for any backend. Here are the top picks in 2025:
JOSE
JOSE (JavaScript Object Signing and Encryption) is a powerful library for JWTs and cryptographic operations. It’s lightweight and offers fine-tuned control for secure token management.
Why use it? Ideal for custom auth workflows with modern security standards.
Passport.js
A long-standing favorite, Passport.js provides middleware for local, OAuth, and JWT authentication. It’s framework-agnostic and pairs well with Express.
Why use it? Reliable, extensible, and widely supported.
Validations: Robust and Type-Safe
Data validation ensures your APIs stay secure and predictable. These libraries lead the pack:
Zod
Zod is a TypeScript-first validation library with intuitive schemas and runtime checks. It’s a staple in 2025 for its type inference and integrations (e.g., tRPC, Hono).
Why use it? Type safety and versatility for modern JS/TS projects.
Valibot
Valibot hit 1.0 in 2025, offering a modular, lightweight (1kB) alternative to Zod. It’s designed for tree-shaking and TypeScript compatibility.
Why use it? Minimalist and performant without sacrificing power.
Joi
Joi remains a go-to for schema validation, especially in JavaScript-heavy projects or frameworks like Fastify.
Why use it? Mature, feature-rich, and great for complex rules.
ORMs: Database Mastery
Managing databases in Node.js is easier with these ORMs:
Prisma
Prisma continues to shine in 2025 with its type-safe query builder, automatic migrations, and support for PostgreSQL, MongoDB, and more.
Why use it? Developer-friendly and a TypeScript dream.
Drizzle ORM
Drizzle is a lightweight, TypeScript-first ORM with a SQL-like API and stellar performance. It’s gaining popularity for its simplicity.
Why use it? Fast and flexible for minimalists.
Mongoose
A popular ODM (Object Data Modeling) library for MongoDB, making it easy to define schemas and relationships.
Why use it? Great for structured MongoDB applications with built-in validation.
Kysely
A TypeScript-first SQL query builder that offers a clean and flexible API without sacrificing type safety.
Why use it? Best for writing raw SQL queries with full TypeScript support.
Local Run and Development: Speedy Tools
Efficient local development is key, and these tools stand out in 2025:
tsup
Written in TypeScript and powered by esbuild (written in Go), tsup is a zero-config bundler for Node.js projects. It’s lightning-fast and simplifies building TypeScript/JavaScript apps or libraries.
Why use it? Speed and simplicity — perfect for rapid iteration.
Biome
Built in Rust, Biome is a high-performance alternative to ESLint and Prettier, offering linting and formatting in one tool. It reached 2.0 beta in 2025 and is winning fans for its speed.
Why use it? Unified, fast, and modern code quality management.
Frameworks: Structure and Performance
Frameworks provide the scaffolding for Node.js backends. Here’s what’s hot in 2025:
NestJS
A TypeScript-first framework with a modular, dependency-injected architecture, NestJS is ideal for scalable, enterprise apps.
Why use it? Structured and robust for complex projects.
Hono.js
Hono is a lightweight, runtime-agnostic framework optimized for speed and simplicity. It’s great for serverless or edge use cases and pairs well with Zod.
Why use it? Fast and flexible for modern deployments.
Elysia
Elysia, built for Bun but compatible with Node.js, offers end-to-end type safety and performance. It’s a rising star in 2025.
Why use it? Cutting-edge and type-safe from top to bottom.
AdonisJS
AdonisJS is a full-stack MVC framework with its own ORM (Lucid) and validation (VineJS). It’s a Laravel-like experience for Node.js devs.
Why use it? Comprehensive and rapid for medium-to-large apps.
Fastify
Fastify delivers high performance with built-in JSON Schema validation and great TypeScript support. It’s a lightweight alternative to Express.
Why use it? Speed and extensibility for APIs.
Others: Must-Have Backend Tools
tRPC
Helps you build a type-safe backend that connects smoothly with the frontend. No need to write REST or GraphQL manually.
Why use it? Less code, fewer bugs, and perfect for TypeScript projects.
BullMQ
A fast and reliable job queue for handling background tasks like sending emails or processing data.
Why use it? Uses Redis for speed, supports retries, and handles large workloads easily.
Socket.IO
Makes real-time features easy, like chat apps, live updates, or notifications.
Why use it? Works on top of WebSockets and handles reconnections automatically.
Why These Tools Matter in 2025
Tools like tsup (powered by Go-based esbuild) and Biome (Rust-built) bring speed and efficiency to your Node.js workflow — tsup for bundling, Biome for linting and formatting. Pair them with frameworks like NestJS or Hono, ORMs like Prisma, and validation libs like Zod or Valibot, and you’ve got a modern stack that balances developer experience and performance.
🚀 Crack Your Next.js Interview! 🚀
Are you preparing for a Next.js interview? Get "Crack Your Next.js Interview: 100+ Essential Questions and Answers", a comprehensive eBook covering essential concepts, real-world scenarios, and expert tips to help you succeed!
📘 What’s inside?
- ✅ 100+ carefully curated Next.js questions
- ✅ Detailed answers with code examples
- ✅ Covers Server Components, App Router, Performance Optimization & more
- ✅ Practical insights for junior to senior developers
🎯 Level up your Next.js skills today!
Top comments (0)