Adrian Prieto

Posted on Jun 27, 2018

Next.js + Styled Components The Really Simple Guide ▲ + 💅

#react #nextjs #ssr #javascript

I recently started using Next.js, and quite honestly I have to say, is an awesome tool, you get a lot out of the box, and while there are some things I don't necessary agree with, overall it makes really simple to create static and server‑rendered applications.

Next comes bundled with styled-jsx, which is a full, scoped and component-friendly CSS support for JSX (rendered on the server or the client), and while this is great, I rather use styled components, it's just my preference.

This guide features how you use a different styling solution than styled-jsx that also supports universal styles. That means we can serve the required styles for the first render within the HTML and then load the rest in the client.

Next.js has an example repo that already comes with styled components, but you need to clone it and then try to understand what is happening under the hood, I decided to make this quick and really simple guide that illustrates the process of making styled components work with next.js.

Lets get to it!

1. Create a project directory and install next and react dependencies



mkdir my-next-app && cd my-next-app && yarn add next react react-dom

Next.js only supports React 16.
We had to drop React 15 support due to the way React 16 works and how we use it.

Next.org

2. Add scripts to your `package.json`



{
  "scripts": {
    "dev": "next",
    "build": "next build",
    "start": "next start"
  },
  "dependencies": {
    "next": "^...",
    "react": "^...",
    "react-dom": "^..."
  }
}

After that, the file-system is the main API. Every .js file becomes a route that gets automatically processed and rendered.

3. Create a /pages directory and your first page.

From your project root directory:



mkdir pages && touch pages/index.js

Populate ./pages/index.js:



export default () => (
   <div>
       <h1>My First Next.js Page</h1>
   </div>
)

and then just run yarn dev and go to http://localhost:3000.

So far, we get:

Automatic transpilation and bundling (with webpack and babel)
Hot code reloading
Server rendering and indexing of ./pages

4. Add styled-components



yarn add styled-components

Let's now edit ./pages/index.js:



import styled from 'styled-components';

export default () => (
  <div>
    <Title>My First Next.js Page</Title>
  </div>
);

const Title = styled.h1`
  color: red;
`;

If you reload the page, you will get an error, this is because we haven’t set up the correct configuration yet, not to worry, we are doing that next.

5. Add babel plugin and custom `.bablerc` file

First, lets install the styled components babel plugin as a dev dependency:



yarn add -D babel-plugin-styled-components

Then create a .babelrc file in the root of the project.



touch .babelrc

Add a babel/preset
Add a styled-components plugin, set the ssr flag to true, displayName to true and preprocess to false.

The final .babelrc file should look like this:



{
  "presets": [
    "next/babel"
  ],
  "plugins": [
    [
      "styled-components",
      {
        "ssr": true,
        "displayName": true,
        "preprocess": false
      }
    ]
  ]
}

Note: displayName will generate class names that are easier to debug (will contain also the component name instead of just hashes); preprocess – experimental feature turned off explicitly.

6. Create the custom `_document.js` file

If you have used create-react-app before, you are used to knowing where your main document is, well, next.js does not expose this file, but you can override the default Document by adding a _document.js file in your pages folder.



touch pages/_document.js

We will be extending the <Document /> and injecting the server side rendered styles into the <head>.

To override that default behavior, you must create a file at ./pages/_document.js, where you can extend the Document class.
https://github.com/zeit/next.js/#custom-document

This is how a custom _document.js would look like, if we just rendered the page and nothing else:



import Document, { Head, Main, NextScript } from 'next/document'

export default class MyDocument extends Document {
  static getInitialProps ({ renderPage }) {
    // Returns an object like: { html, head, errorHtml, chunks, styles }     
    return renderPage();
  }

  render () {    
    return (
      <html>
        <Head>
          <title>My page</title>
        </Head>
        <body>
          <Main />
          <NextScript />
        </body>
      </html>
    )
  }
}

This is how it looks like once we add SSR styled components.



import Document, { Head, Main, NextScript } from 'next/document';
// Import styled components ServerStyleSheet
import { ServerStyleSheet } from 'styled-components';

export default class MyDocument extends Document {
  static getInitialProps({ renderPage }) {
    // Step 1: Create an instance of ServerStyleSheet
    const sheet = new ServerStyleSheet();

    // Step 2: Retrieve styles from components in the page
    const page = renderPage((App) => (props) =>
      sheet.collectStyles(<App {...props} />),
    );

    // Step 3: Extract the styles as <style> tags
    const styleTags = sheet.getStyleElement();

    // Step 4: Pass styleTags as a prop
    return { ...page, styleTags };
  }

  render() {
    return (
      <html>
        <Head>
          <title>My page</title>
          {/* Step 5: Output the styles in the head  */}
          {this.props.styleTags}
        </Head>
        <body>
          <Main />
          <NextScript />
        </body>
      </html>
    );
  }
}

Once this is done, restart your server and the error should go away, your <h1> tag should be red, and SSR styled components should work.

Thats it, so to recapitulate:

Create a project and install dependencies
Add scripts
Create a pages folder and a first page
Add styled components
Add a babel plugin and a custom .babelrc file
Create a custom _document.js file

As you can see, if you already have an existing next.js project, you only need to implement steps 4 to 6.

There is also a way to use plain .css files with next.js, I will be writing a guide on how to set it up soon.

Resources

This post was originally posted on my website on 06/26/2018.

Latest comments (38)

Nick Lima • Mar 5 '22

Thanks for the post. It helped me a lot in the past.

I'm here to thank you and to say for the future users looking for styled-components on Next.js that now with the new Next.js 12 version, you can handle the styled-components natively in next-config file:

// next.config.js

module.exports = {
  compiler: {
    // ssr and displayName are configured by default
    styledComponents: true,
  },
}

Matheus Damião • Jan 18 '23

Thank you! That was a huge saving!

bbynog • Dec 21 '22

thank you!

jan paul • Dec 24 '21

sorry to comment so late on this man. dont know if you will even read this.

do you have some experiences how much your steps 1- 4 in

MyDocument extends Document

would impact speed, in terms of build time?

i mean is styled components still i thing in react nowadays? i moved to angular and am tinkering on next in spare time, but did not quiete like tailwinds bootstrappy approach

Daniel Gadd • Sep 29 '21 • Edited

What about the error
error The mandatory attribute 'amp-custom' is missing in tag 'style amp-custom'
This article either has to be depreciated or updated to support amp

Julio Lima • Sep 19 '21

Amazing the configuration of ".babelrc" was not working with the default configuration of provided by styled components, something related with works just in CRA.

I'll add something... "styled-components" already have the "babel-plugin-styled-components" so you don't need to install.