Getting Started with MUI and Next.js

What is MUI and Why Use It with Next.js?

MUI (formerly Material-UI) provides a comprehensive set of React components that implement Google's Material Design specification. When combined with Next.js, developers gain access to server-side rendering, automatic code splitting, image optimization, and built-in performance features.

Key benefits of the pairing:

• Consistent Design Language: Pre-built, accessible components following Material Design principles
• Server-Side Rendering Support: Proper SSR configuration prevents hydration mismatches
• Theming System: Customizable themes with CSS-in-JS architecture
• Performance: Next.js optimization features work alongside MUI's component architecture

This combination is particularly valuable for custom web development projects where rapid prototyping and consistent UI patterns are essential.

Prerequisites

• Node.js and npm installed
• Basic understanding of React and Next.js
• A new or existing Next.js project

Installation and Dependencies

Required Packages

To use MUI with Next.js, install the following packages:

npm install @mui/material @emotion/react @emotion/styled @emotion/server

These packages include:

• @mui/material: Core component library with all Material Design components
• @emotion/react: CSS-in-JS runtime for styling
• @emotion/styled: Styled components API for MUI
• @emotion/server: Server-side rendering support for Emotion

Development Dependencies

Additional useful packages for enhanced functionality:

• @mui/icons-material: Material Design icons
• @mui/lab: Experimental components
• @mui/system: Low-level styling utilities

For React application development, having these components readily available accelerates the UI building process significantly.

Building a component library with TypeScript is a natural next step after mastering MUI basics, allowing you to create reusable, well-typed components for your projects.

Project Structure for MUI Integration

A well-structured MUI + Next.js project typically includes:

src/
├── theme/
│ ├── index.js # Theme configuration
│ └── palette.js # Color palette definitions
├── components/ # Reusable MUI-based components
└── createEmotionCache.js # Emotion cache configuration
pages/
├── _app.js # App wrapper with providers
├── _document.js # SSR configuration
└── index.js # Page using MUI components

This separation of concerns keeps theme configuration organized and makes it easy to maintain custom theming across the application. A well-organized project structure also supports scalable architecture practices that benefit long-term maintenance.

Creating the Emotion Cache

The Emotion cache is essential for server-side rendering to work correctly:

// src/createEmotionCache.js
import createCache from '@emotion/cache';

export default function createEmotionCache() {
 return createCache({
 key: 'css',
 prepend: true, // Ensures MUI styles are injected first
 });
}

The prepend: true option is critical--it ensures MUI styles load before your custom styles, preventing flash of unstyled content (FOUC). This attention to detail is part of our commitment to performance optimization in every project we build.

Understanding the CSS Object Model provides deeper insight into how Emotion manages styles under the hood.

Theme Configuration

Creating a Custom Theme

MUI's theming system allows comprehensive customization:

// src/theme.js
import { createTheme } from '@mui/material/styles';
import { red } from '@mui/material/colors';

const theme = createTheme({
 palette: {
 primary: {
 main: '#556cd6',
 },
 secondary: {
 main: '#19857b',
 },
 error: {
 main: red.A400,
 },
 },
 typography: {
 fontFamily: '"Roboto", "Helvetica", "Arial", sans-serif',
 h1: {
 fontSize: '2.5rem',
 fontWeight: 500,
 },
 },
 components: {
 MuiButton: {
 styleOverrides: {
 root: {
 borderRadius: 8,
 },
 },
 },
 },
});

export default theme;

Theme Customization Options

The theme can customize:

• Colors: Primary, secondary, error, warning, info, success palettes
• Typography: Font family, sizes, weights, line heights
• Spacing: Spacing scale for margins and padding
• Breakpoints: Responsive breakpoints for mobile, tablet, desktop
• Components: Global overrides for any component's styles

Consistent theming across your application ensures brand alignment, which is essential for professional web applications that require polished user interfaces.

For modern styling techniques, explore our guide on styling HTML with modern CSS to complement MUI's theming capabilities.

Server-Side Rendering Setup

Configuring _document.js

The _document.js file requires special handling for MUI to work correctly with server-side rendering. This configuration:

• Extracts critical CSS during server-side rendering
• Injects styles into the document head
• Prevents hydration mismatches
• Ensures consistent styling across server and client

// pages/_document.js
import * as React from 'react';
import Document, { Html, Head, Main, NextScript } from 'next/document';
import createEmotionServer from '@emotion/server/create-instance';
import theme from '../src/theme';
import createEmotionCache from '../src/createEmotionCache';

export default class MyDocument extends Document {
 render() {
 return (
 <Html lang="en">
 <Head>
 <meta name="theme-color" content={theme.palette.primary.main} />
 <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700&display=swap" />
 {this.props.emotionStyleTags}
 </Head>
 <body>
 <Main />
 <NextScript />
 </body>
 </Html>
 );
 }

 getInitialProps = async (ctx) => {
 const originalRenderPage = ctx.renderPage;
 const cache = createEmotionCache();
 const { extractCriticalToChunks } = createEmotionServer(cache);

 ctx.renderPage = () => originalRenderPage({
 enhanceApp: (App) => function EnhanceApp(props) {
 return <App emotionCache={cache} {...props} />;
 },
 });

 const initialProps = await Document.getInitialProps(ctx);
 const emotionStyles = extractCriticalToChunks(initialProps.html);
 const emotionStyleTags = emotionStyles.styles.map((style) => (
 <style data-emotion={`${style.key} ${style.ids.join(' ')}`} key={style.key} dangerouslySetInnerHTML={{ __html: style.css }} />
 ));

 return { ...initialProps, emotionStyleTags };
 };
}

Proper SSR configuration is crucial for SEO performance and Core Web Vitals metrics, as search engines prefer pre-rendered HTML content.

App Integration with _app.js

Wrapping the Application

The _app.js file serves as the application wrapper where providers are configured:

// pages/_app.js
import * as React from 'react';
import { ThemeProvider } from '@mui/material/styles';
import CssBaseline from '@mui/material/CssBaseline';
import { CacheProvider } from '@emotion/react';
import theme from '../src/theme';
import createEmotionCache from '../src/createEmotionCache';

const clientSideEmotionCache = createEmotionCache();

export default function MyApp(props) {
 const { Component, emotionCache = clientSideEmotionCache, pageProps } = props;

 return (
 <CacheProvider value={emotionCache}>
 <ThemeProvider theme={theme}>
 <CssBaseline />
 <Component {...pageProps} />
 </ThemeProvider>
 </CacheProvider>
 );
}

Understanding the Providers

• CacheProvider: Provides the Emotion cache to all components
• ThemeProvider: Makes the custom theme available throughout the app
• CssBaseline: Resets browser inconsistencies and provides Material Design base styles

This provider pattern is a fundamental concept in modern React development and ensures consistent application-wide behavior.

To deepen your understanding of React state and interactivity patterns, see our guide on React interactivity, events, and state.

Using MUI Components in Next.js Pages

Basic Component Example

// pages/index.js
import * as React from 'react';
import { Button, Typography, Container, Box, AppBar, Toolbar } from '@mui/material';

export default function Home() {
 return (
 <Container maxWidth="md">
 <AppBar position="static">
 <Toolbar>
 <Typography variant="h6" component="div" sx={{ flexGrow: 1 }}>
 My MUI + Next.js App
 </Typography>
 <Button color="inherit">Login</Button>
 </Toolbar>
 </AppBar>
 
 <Box sx={{ my: 4 }}>
 <Typography variant="h2" component="h1" gutterBottom>
 Welcome to MUI with Next.js
 </Typography>
 <Typography variant="body1" paragraph>
 This page demonstrates how to use MUI components in a Next.js application.
 </Typography>
 <Button variant="contained" color="primary">
 Get Started
 </Button>
 </Box>
 </Container>
 );
}

Component Categories

MUI provides components in several categories:

• Inputs: Buttons, text fields, selects, sliders, switches
• Navigation: App bars, drawers, tabs, breadcrumbs
• Surfaces: Cards, dialogs, expansion panels, papers
• Feedback: Progress indicators, snackbars, alerts
• Data Display: Typography, tables, lists, chips
• Layout: Grid, box, container, stack

The extensive component library enables rapid development of full-featured web applications without sacrificing design quality or accessibility.

For advanced TypeScript integration, learn about TypeScript mapped types to create type-safe component prop patterns.

Performance Best Practices

Optimizing for Core Web Vitals

To ensure your MUI + Next.js application performs well:

1. Use Dynamic Imports for Heavy Components

import dynamic from 'next/dynamic';
const HeavyComponent = dynamic(
() => import('../components/HeavyComponent'),
{ loading: () => <p>Loading...</p> }
);

2. Leverage Next.js Image Component

import Image from 'next/image';

3. Minimize Bundle Size

• Import only needed components
• Use tree-shaking with ES modules
• Consider code splitting for large features

4. Optimize Fonts

• Use next/font for automatic optimization
• Preload critical fonts

Server-Side Rendering Benefits

Proper SSR configuration with MUI provides:

• Faster First Contentful Paint (FCP)
• Improved Largest Contentful Paint (LCP)
• Better SEO with pre-rendered HTML
• Reduced Time to Interactive (TTI)

These optimizations are essential for high-performance web applications that prioritize user experience and search engine visibility.

Dark Mode Support

MUI supports dark mode through the theme configuration:

const theme = createTheme({
 palette: {
 mode: 'dark',
 primary: {
 main: '#90caf9',
 },
 },
});

To implement toggling, use MUI's useMediaQuery and a theme context to switch between light and dark modes based on user preference or system settings.

Common Issues and Solutions

Flash of Unstyled Content (FOUC) If users see unstyled content briefly, ensure:

• Emotion cache is properly configured
• _document.js is correctly set up
• ThemeProvider wraps the entire application

Hydration Mismatch Errors To prevent hydration errors:

• Use the suppressHydrationWarning prop on components that generate dynamic content
• Ensure SSR and client-side rendering produce identical results

Addressing these technical challenges early in development prevents issues in production deployments and ensures a polished user experience.

Sources

1. GeeksforGeeks - How to use Material-UI with Next.js - Comprehensive step-by-step tutorial covering SSR setup, Emotion cache configuration, theme creation, and _app.js integration
2. MUI Material UI - Learning Resources - Official documentation linking to Next.js example projects and best practices