Changing font family of all MUI components

Can we change the font family of MUI components with less code. I have tried many ways but still, I can't able to do it. I have to change the font family individually which is really a lot of work. Are there any other ways to do that?

You can change the font in material-ui@next library doing the following. Suppose in your <App /> which is defined like the following

// Material UI
import { MuiThemeProvider, createMuiTheme } from 'material-ui/styles';

const App = () => (
  <MuiThemeProvider theme={THEME}>
    <Provider store={store}>
      <Router history={appHistory} routes={Routes} />
    </Provider>
  </MuiThemeProvider>
 );

 ReactDOM.render(<App />, document.getElementById('app'));

In the theme prop for MuiThemeProvider you provide the following where

const THEME = createMuiTheme({
   typography: {
    "fontFamily": `"Roboto", "Helvetica", "Arial", sans-serif`,
    "fontSize": 14,
    "fontWeightLight": 300,
    "fontWeightRegular": 400,
    "fontWeightMedium": 500
   }
});

Then somewhere in your css or your main index.html file include this @import url('https://fonts.googleapis.com/css?family=Roboto:300,400,500,700');

For a list of all params you can give to createMuiTheme Default Theme Params Regarding the docs itself for changing the MuiTheme they are as follows. Themes Material UI Next

Regarding the <Reboot /> part you can have a look at the documentation here Material UI Reboot Details

**** UPDATES *****

Adding to the accepted answer by Adeel.

For the latest Material-UI(v4+) components, the imports, as well as MuiThemeProvider, have been changed.

So now in your App.js, do the following:

import { createMuiTheme } from '@material-ui/core/styles';
import { ThemeProvider } from '@material-ui/styles';
import './Styles/App.css';

const theme = createMuiTheme({
  typography: {
    fontFamily: [
      'Nunito',
      'Roboto',
      '"Helvetica Neue"',
      'Arial',
      'sans-serif'
    ].join(','),
  }
});

class App extends Component {
  render() {
    return (
      <ThemeProvider theme={theme}>
        <div className="App">
          <MainApp />
        </div>
      </ThemeProvider>
    );
  }
}

export default App;

Now for example, I've added the Nunito font. So I had to add the same to the App.css (which is being imported in App.js) in the following way:

@font-face {
  font-family: 'Nunito';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: local('Nunito Regular'), local('Nunito-Regular'), 
   url(https://fonts.gstatic.com/s/nunito/v11/XRXV3I6Li01BKofINeaBTMnFcQ.woff2) 
   format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, 
    U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, 
    U+2215, U+FEFF, U+FFFD;
}

In MUI v5, also make sure ThemeProvider and createTheme is imported from @mui/material/styles and not from @mui/styles. I was stuck for hours thinking why it's not working.

import { ThemeProvider, createTheme } from '@mui/styles'; ❌

import { ThemeProvider, createTheme } from '@mui/material/styles'; ✅

const theme = createTheme({
  typography: {
    allVariants: {
      fontFamily: 'serif',
      textTransform: 'none',
      fontSize: 16,
    },
  },
});

function App() {
  return (
      <ThemeProvider theme={theme}>
        ...
      </ThemeProvider>
  );
}

Hoping this can help someone...you need to be really careful with commas and brackets when declaring your styles within createMuiTheme

It's really easy to mess this up. For instance, palette is one big object...so is typography, make sure everything is in the right place. I had random problems caused by doing this wrong.

  palette: {
    primary: {
      light: '#ff8e8c',
      main: '#ff5a5f',
      dark: '#c62035',
      contrastText: '#fff',
    },
    secondary: {
      light: '#4da9b7',
      main: '#017a87',
      dark: '#004e5a',
      contrastText: '#000',
    },
  },
  typography: {
      fontFamily: "'Montserrat', sans-serif",
      textTransform: "none",
   
  
   button: {
  
    textTransform: "none",

  },

This is now the preferred method:

const theme = createMuiTheme({
  typography: {
    fontFamily: [
      '-apple-system',
      'BlinkMacSystemFont',
      '"Segoe UI"',
      'Roboto',
      '"Helvetica Neue"',
      'Arial',
      'sans-serif',
      '"Apple Color Emoji"',
      '"Segoe UI Emoji"',
      '"Segoe UI Symbol"',
    ].join(','),
  },
});

As noted here: https://material-ui.com/customization/typography/

In MUI v5, you can update the fontFamily or any other CSS properties of all Typography variants easily:

const theme = createTheme({
  typography: {
    allVariants: {
      fontFamily: 'serif',
    },
  },
})

To change the fontFamily dynamically in your app, you can use useMemo to create a new theme object based on the latest fontFamily value:

const defaultFontFamily = 'serif';
const [fontFamily, setFontFamily] = React.useState(defaultFontFamily);

const theme = React.useMemo(
  () =>
    createTheme({
      typography: {
        allVariants: { fontFamily },
      },
    }),
  [fontFamily],
);

return (
  <div>
    <Select
      defaultValue={defaultFontFamily}
      onChange={(e) => setFontFamily(e.target.value)}
    >
      <MenuItem value="serif">serif</MenuItem>
      <MenuItem value="sans-serif">sans-serif</MenuItem>
    </Select>
    <ThemeProvider theme={theme}>
      <Content />
    </ThemeProvider>
  </div>
);

Live Demo

This seem to work for me

GlobalStyleOverrides.js

import { createTheme, responsiveFontSizes } from '@mui/material/styles';

export default function GlobalStyleOverrides() {
  const theme = createTheme({       
    typography: {
      fontFamily: [
        '"Bebas Neue"',
        'Roboto',
        '"Helvetica Neue"',
        'Arial',
        'sans-serif',
      ].join(','),         
      body1: {
        fontFamily: "'Poppins', Arial, sans-serif",
      },
    },
    components: {
      MuiButton: {
        variants: [
          {
            props: { variant: 'contained' },
            style: {
              textTransform: 'none',
              border: `10px dashed red`,
            },
          },              
        ],
      },
    },
  });

  return responsiveFontSizes(theme);
}

App.js

import GlobalStyleOverrides from 'components/_base/global-style-overrides/GlobalStyleOverrides';
...
function App() {
  return (
    <ThemeProvider theme={GlobalStyleOverrides()}>
      <Router>
        ...
      </Router>
    </ThemeProvider>
  );
}