How to Use NextJS in Typescript?
Last Updated : 06 Aug, 2024
TypeScript enhances Next.js applications by adding static type checking and improves developer experience through type safety. Integrating TypeScript into your Next.js project helps catch errors early and improves code maintainability. It offers even greater productivity and robustness to your web development projects. In this article, we will discuss how to use NextJS in TypeScript.
What is TypeScript?
TypeScript, a language developed and maintained by Microsoft, stands out as a popular choice among developers. Acting as a superset of JavaScript, it accommodates all valid JavaScript syntax seamlessly. By embracing TypeScript, you can enhance your JavaScript projects with static type-checking capabilities, ensuring error detection at compile time. Furthermore, TypeScript facilitates the integration of modern language features not yet supported in JavaScript. Importantly, TypeScript compiles down to plain JavaScript, ensuring seamless compatibility with browsers.
Why should you use NextJS with TypeScript?
Combining Next.js with TypeScript yields a potent blend of advantages that elevate developers' experiences and enhance application quality. Using Next.js with TypeScript provides type safety, enhances developer experience, improves scalability, offers robust community support, future-proofs projects, and fosters code maintainability and collaboration.
Setting up a NextJS project with TypeScript
Step 1: Create a NextJS App using below command
npx create-next-app my-next-app --typescript
Step 2: Navigate to the project directory
cd my-next-app
Step 3: Install the typescript package globally using the below command
npm install -g typescript
Project Structure:
Folder StructureThe updated dependencies in the package.json file are:
"dependencies": { "next": "14.2.1", "react": "^18", "react-dom": "^18" }, "devDependencies": { "@types/node": "^20", "@types/react": "^18", "typescript": "^5" }Step 4: Run the development server
npm run dev
Example: The below example contains default page and layout files of next.js project wrtten in tsx.
JavaScript // page.tsx import Image from "next/image"; export default function Home() { return ( <main className="flex min-h-screen flex-col items-center justify-between p-24" > <div className="z-10 max-w-5xl w-full items-center justify-between font-mono text-sm lg:flex" > <p className="fixed left-0 top-0 flex w-full justify-center border-b border-gray-300 bg-gradient-to-b from-zinc-200 pb-6 pt-8 backdrop-blur-2xl dark:border-neutral-800 dark:bg-zinc-800/30 dark:from-inherit lg:static lg:w-auto lg:rounded-xl lg:border lg:bg-gray-200 lg:p-4 lg:dark:bg-zinc-800/30" > Get started by editing <code className="font-mono font-bold">app/page.tsx</code> </p> <div className="fixed bottom-0 left-0 flex h-48 w-full items-end justify-center bg-gradient-to-t from-white via-white dark:from-black dark:via-black lg:static lg:h-auto lg:w-auto lg:bg-none" > <a className="pointer-events-none flex place-items-center gap-2 p-8 lg:pointer-events-auto lg:p-0" href= "https://vercel.com?utm_source=create-next-app&utm_medium=appdir-template&utm_campaign=create-next-app" target="_blank" rel="noopener noreferrer" > By{" "} <Image src="/vercel.svg" alt="Vercel Logo" className="dark:invert" width={100} height={24} priority /> </a> </div> </div> <div className="relative flex place-items-center before:absolute before:h-[300px] before:w-[480px] before:-translate-x-1/2 before:rounded-full before:bg-gradient-radial before:from-white before:to-transparent before:blur-2xl before:content-[''] after:absolute after:-z-20 after:h-[180px] after:w-[240px] after:translate-x-1/3 after:bg-gradient-conic after:from-sky-200 after:via-blue-200 after:blur-2xl after:content-[''] before:dark:bg-gradient-to-br before:dark:from-transparent before:dark:to-blue-700 before:dark:opacity-10 after:dark:from-sky-900 after:dark:via-[#0141ff] after:dark:opacity-40 before:lg:h-[360px] z-[-1]" > <Image className="relative dark:drop-shadow-[0_0_0.3rem_#ffffff70] dark:invert" src="/next.svg" alt="Next.js Logo" width={180} height={37} priority /> </div> <div className="mb-32 grid text-center lg:max-w-5xl lg:w-full lg:mb-0 lg:grid-cols-4 lg:text-left" > <a href= "https://nextjs.org/docs?utm_source=create-next-app&utm_medium=appdir-template&utm_campaign=create-next-app" className="group rounded-lg border border-transparent px-5 py-4 transition-colors hover:border-gray-300 hover:bg-gray-100 hover:dark:border-neutral-700 hover:dark:bg-neutral-800/30" target="_blank" rel="noopener noreferrer" > <h2 className={`mb-3 text-2xl font-semibold`}> Docs{" "} <span className="inline-block transition-transform group-hover:translate-x-1 motion-reduce:transform-none" > -> </span> </h2> <p className={`m-0 max-w-[30ch] text-sm opacity-50`}> Find in-depth information about Next.js features and API. </p> </a> <a href= "https://nextjs.org/learn?utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app" className="group rounded-lg border border-transparent px-5 py-4 transition-colors hover:border-gray-300 hover:bg-gray-100 hover:dark:border-neutral-700 hover:dark:bg-neutral-800/30" target="_blank" rel="noopener noreferrer" > <h2 className={`mb-3 text-2xl font-semibold`}> Learn{" "} <span className="inline-block transition-transform group-hover:translate-x-1 motion-reduce:transform-none" > -> </span> </h2> <p className={`m-0 max-w-[30ch] text-sm opacity-50`}> Learn about Next.js in an interactive course with quizzes! </p> </a> <a href= "https://vercel.com/templates?framework=next.js&utm_source=create-next-app&utm_medium=appdir-template&utm_campaign=create-next-app" className="group rounded-lg border border-transparent px-5 py-4 transition-colors hover:border-gray-300 hover:bg-gray-100 hover:dark:border-neutral-700 hover:dark:bg-neutral-800/30" target="_blank" rel="noopener noreferrer" > <h2 className={`mb-3 text-2xl font-semibold`}> Templates{" "} <span className="inline-block transition-transform group-hover:translate-x-1 motion-reduce:transform-none" > -> </span> </h2> <p className={`m-0 max-w-[30ch] text-sm opacity-50`}> Explore starter templates for Next.js. </p> </a> <a href= "https://vercel.com/new?utm_source=create-next-app&utm_medium=appdir-template&utm_campaign=create-next-app" className="group rounded-lg border border-transparent px-5 py-4 transition-colors hover:border-gray-300 hover:bg-gray-100 hover:dark:border-neutral-700 hover:dark:bg-neutral-800/30" target="_blank" rel="noopener noreferrer" > <h2 className={`mb-3 text-2xl font-semibold`}> Deploy{" "} <span className="inline-block transition-transform group-hover:translate-x-1 motion-reduce:transform-none" > -> </span> </h2> <p className={`m-0 max-w-[30ch] text-sm opacity-50`}> Instantly deploy your Next.js site to a shareable URL with Vercel. </p> </a> </div> </main> ); } // layout.tsx import type { Metadata } from "next"; import { Inter } from "next/font/google"; import "./globals.css"; const inter = Inter({ subsets: ["latin"] }); export const metadata: Metadata = { title: "Create Next App", description: "Generated by create next app", }; export default function RootLayout({ children, }: { children: React.ReactNode, }) { return ( <html lang="en"> <body className={inter.className}>{children}</body> </html> ); } Output:
OutputExample 1: Create a TypeScript component
Inside the pages directory of your project, create a new TypeScript file named hello.tsx with the following content.
JavaScript import React from "react"; const Hello: React.FC = () => { return <h1>Hello, Next.js with TypeScript!</h1>; }; export default Hello; Example 2: Update the index page
Modify the index.tsx file in the pages directory to import and render the Hello component.
JavaScript import React from 'react'; import Hello from './hello'; const IndexPage: React.FC = () => { return ( <div> <Hello /> </div> ); }; export default IndexPage; Output:
How to Use NextJS in Typescript?Benefits of Using TypeScript with Next.js
- Static Typing: TypeScript's static typing allows for early detection of errors during development, leading to more robust and error-free code.
- Improved Developer Experience: TypeScript enhances code editor features like autocompletion, navigation, and refactoring, making the development process smoother and more efficient.
- Enhanced Code Readability: With explicit type annotations, code becomes more readable and maintainable, making it easier for developers to understand the codebase.
- Better Tooling: TypeScript integrates well with modern IDEs, providing powerful tools for code analysis, debugging, and testing.
- Seamless Refactoring: Refactoring large codebases becomes safer and easier with TypeScript, as type errors are caught early in the process.
- Interoperability: TypeScript works seamlessly with existing JavaScript libraries and frameworks, allowing for gradual adoption in existing projects.
Conclusion
Using TypeScript with Next.js enhances your development experience by providing type safety, catching errors early, and improving code readability. By following these steps, you can easily integrate TypeScript into your Next.js project and leverage its benefits for a more robust application.
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