Getting Started with Next.js 14 and TypeScript

Next.js 14 brings significant improvements to the developer experience with the new App Router, server components, and optimized performance. In this guide, we'll explore how to set up a modern web application from scratch.

Why Next.js 14?

Next.js 14 introduces several game-changing features:

Server Components: Write less JavaScript for better performance

App Router: Improved routing with nested layouts and loading states

Server Actions: Mutate data without creating API routes

Partial Prerendering: Combine static and dynamic content seamlessly

Setting Up Your Project

npx create-next-app@latest my-app --typescript --tailwind --eslint

This command sets up everything you need for a production-ready application.

Key Concepts

Server vs Client Components

In Next.js 14, components are server components by default. This means:

They run only on the server

They can directly access databases

They reduce the JavaScript bundle sent to the client

// This is a Server Component (default)
async function BlogPost({ id }: { id: string }) {
  const post = await db.post.findUnique({ where: { id } })
  return <Article post={post} />
}

Data Fetching

With server components, data fetching becomes straightforward:

async function getPosts() {
  const res = await fetch('https://api.example.com/posts')
  return res.json()
}

export default async function Posts() {
  const posts = await getPosts()
  return <PostList posts={posts} />
}

Conclusion

Next.js 14 represents a major leap forward in React development. Its emphasis on server-first architecture, combined with TypeScript support, makes it an excellent choice for building modern web applications.