Creating a Next.js app with TypeScript is a straightforward process thanks to the create-next-app tool. This tool is built by the Next.js team and is designed to quickly set up a new Next.js project with a variety of templates and features.
To get started, you will need to have Node.js and npm (or yarn) installed on your machine. Once you have these dependencies installed, you can use the npx command to create a new Next.js app with TypeScript.
First, open up your terminal and navigate to the directory where you want to create your new app. Then, run the following command:
npx create-next-app my-app --template with-typescript
This command will create a new directory called my-app in the current directory and install all the necessary dependencies for a Next.js app with TypeScript. Once the installation is complete, navigate into the new directory:
cd my-app
You can now start the development server by running the following command:
npm run dev
or
yarn dev
This will start a development server and open your new app in a browser window at http://localhost:3000.
Now you can start editing the files in the my-app folder and see the changes in the browser. The pages directory contains the entry point for your app. For example, the index.tsx file is the root page for your app.
import Head from 'next/head'
export default function Home() {
return (
<div className="container">
<Head>
<title>My App</title>
<link rel="icon" href="/favicon.ico" />
</Head>
<main>
<h1 className="title">
Welcome to My App
</h1>
</main>
</div>
)
}
You can also create new pages by adding new files to the pages directory. For example, if you create a new file called about.tsx, it will be available at the /about route.
import Head from 'next/head'
export default function About() {
return (
<div>
<Head>
<title>About</title>
<link rel="icon" href="/favicon.ico" />
</Head>
<main>
<h1>About Page</h1>
</main>
</div>
)
}
In addition to the pages directory, you'll also see a src directory. This directory contains the TypeScript configuration file tsconfig.json, and any additional TypeScript files you'd like to add.
{
"compilerOptions": {
"target": "esnext",
"module": "esnext",
"jsx": "preserve",
"lib": [
"dom",
"dom.iterable",
"esnext"
],
"allowJs": true,
"skipLibCheck": true,
"strict": true,
"forceConsistentCasingInFileNames
Once you have your Next.js app with TypeScript set up, you can start building out your application. One of the key features of Next.js is its built-in support for server-side rendering, which allows your app to load faster and improve SEO. To take advantage of this feature, you can create `getServerSideProps` or `getInitialProps` functions in your pages.
`getServerSideProps` is a function that runs on the server and is used to fetch data and pass it down to the page as props. It takes in a context object that contains information about the request and the response. Here's an example of how you can use `getServerSideProps` to fetch data from an external API and pass it down to a page:
import axios from 'axios';
export async function getServerSideProps(context) {
const { data } = await axios.get('https://jsonplaceholder.typicode.com/todos/1');
return {
props: {
data
}
}
}
export default function Todo({ data }) {
return (
<main>
<h1>Todo Item</h1>
<p>{data.title}</p>
</main>
</div>
- }
`getInitialProps` is similar to `getServerSideProps`, but it runs on the client and the server. This means that the data will be fetched on the server-side during the first render, and on the client-side when navigating to the page using the client-side routing.
Another important feature of Next.js is its built-in support for dynamic routes. This allows you to create pages that accept parameters, which can be used to fetch data and display it on the page. To create a dynamic route, you can use the `[param].tsx` syntax in your `pages` directory. Here's an example of how you can create a dynamic route for a page that displays a specific todo item:
import axios from 'axios';
export async function getServerSideProps({ params }) {
const { data } = await axios.get(https://jsonplaceholder.typicode.com/todos/${params.id});
return {
props: {
data
}
}
}
export default function Todo({ data }) {
return (
<main>
<h1>Todo Item</h1>
<p>{data.title}</p>
</main>
</div>
- }
You can now navigate to `/todos/1` and it will show the data from the external API.
In addition to these features, Next.js also provides a variety of built-in components and utilities to help you build your app, such as the `Link` component for client-side routing, and the
## Popular questions
1. What is the command to create a new Next.js app with TypeScript using `create-next-app`?
The command is `npx create-next-app my-app --template with-typescript`, this command will create a new directory called `my-app` in the current directory and install all the necessary dependencies for a Next.js app with TypeScript.
2. How do I start the development server for my new Next.js app with TypeScript?
You can start the development server by running the command `npm run dev` or `yarn dev` in the root of the project. This will start a development server and open your new app in a browser window at `http://localhost:3000`.
3. What is the purpose of the `pages` directory in a Next.js app with TypeScript?
The `pages` directory contains the entry point for your app. For example, the `index.tsx` file is the root page for your app. Each file in the pages directory corresponds to a route in the application.
4. What is the difference between `getServerSideProps` and `getInitialProps`?
`getServerSideProps` is a function that runs on the server and is used to fetch data and pass it down to the page as props. `getInitialProps` is similar to `getServerSideProps`, but it runs on the client and the server. This means that the data will be fetched on the server-side during the first render, and on the client-side when navigating to the page using the client-side routing.
5. How can I create a dynamic route in Next.js with TypeScript?
To create a dynamic route, you can use the `[param].tsx` syntax in your `pages` directory
### Tag
Nextjs
