Customizing Icons (Old Frontend System)

info

This documentation is for Backstage apps that still use the old frontend system. If your app uses the new frontend system, read the current guide instead.

Backstage comes with a set of default icons used throughout the app, for example in the sidebar, entity links, and catalog kind badges. You can override any of these icons or register additional ones to match your organization's visual identity.

In the old frontend system, icons are supplied directly to the createApp call in packages/app/src/App.tsx.

Custom icons

Requirements

• Files in .svg format or any image format that can be rendered as a React component.
• React components created for the icons.

Create a React component

In your frontend application, locate the src folder. Create an assets/icons directory and a customIcons.tsx file:

packages/app/src/assets/icons/customIcons.tsx

import { SvgIcon, SvgIconProps } from '@material-ui/core';

export const ExampleIcon = (props: SvgIconProps) => (
  <SvgIcon {...props} viewBox="0 0 24 24">
    <path
      fill="currentColor"
      d="M11.6335 10.8398C11.6335 11.6563 12.065 12.9922 13.0863 12.9922C14.1075 12.9922 14.539 11.6563 14.539 10.8398C14.539 10.0234 14.1075 8.6875 13.0863 8.6875C12.065 8.6875 11.6335 10.0234 11.6335 10.8398V10.8398ZM2.38419e-07 8.86719C2.38419e-07 10.1133 0.126667 11.4336 0.692709 12.5781C2.19292 15.5703 6.3175 15.5 9.27042 15.5C12.2708 15.5 16.6408 15.6055 18.2004 12.5781C18.7783 11.4453 19 10.1133 19 8.86719C19 7.23047 18.4498 5.68359 17.3573 4.42969C17.5631 3.8125 17.6621 3.16406 17.6621 2.52344C17.6621 1.68359 17.4681 1.26172 17.0842 0.5C15.291 0.5 14.1431 0.851562 12.7775 1.90625C11.6296 1.63672 10.45 1.51562 9.26646 1.51562C8.19771 1.51562 7.12104 1.62891 6.08396 1.875C4.73813 0.832031 3.59021 0.5 1.81687 0.5C1.42896 1.26172 1.23896 1.68359 1.23896 2.52344C1.23896 3.16406 1.34188 3.80078 1.54375 4.40625C0.455209 5.67188 2.38419e-07 7.23047 2.38419e-07 8.86719V8.86719ZM2.54521 10.8398C2.54521 9.125 3.60208 7.61328 5.45458 7.61328C6.20271 7.61328 6.91917 7.74609 7.67125 7.84766C8.26104 7.9375 8.85083 7.97266 9.45646 7.97266C10.0581 7.97266 10.6479 7.9375 11.2417 7.84766C11.9819 7.74609 12.7063 7.61328 13.4583 7.61328C15.3108 7.61328 16.3677 9.125 16.3677 10.8398C16.3677 14.2695 13.1852 14.7969 10.4144 14.7969H8.50646C5.72375 14.7969 2.54521 14.2734 2.54521 10.8398V10.8398ZM5.81479 8.6875C6.83604 8.6875 7.2675 10.0234 7.2675 10.8398C7.2675 11.6563 6.83604 12.9922 5.81479 12.9922C4.79354 12.9922 4.36208 11.6563 4.36208 10.8398C4.36208 10.0234 4.79354 8.6875 5.81479 8.6875Z"
    />
  </SvgIcon>
);

Use the custom icon

Supply your custom icon in packages/app/src/App.tsx:

packages/app/src/App.tsx

import { ExampleIcon } from './assets/icons/customIcons';

const app = createApp({
  apis,
  themes: [
    /* ... */
  ],
  icons: {
    github: ExampleIcon,
  },
  bindRoutes({ bind }) {
    /* ... */
  },
});

Adding icons

If the default icons do not cover your needs, you can register additional icons so that they can be referenced in places like entity links. For this example we use the AlarmIcon from Material UI:

packages/app/src/App.tsx

import AlarmIcon from '@material-ui/icons/Alarm';

const app = createApp({
  apis,
  icons: {
    alert: AlarmIcon,
  },
  themes: [
    /* ... */
  ],
});

You can then reference alert as the icon in entity links:

apiVersion: backstage.io/v1alpha1
kind: Component
metadata:
  name: artist-lookup
  description: Artist Lookup
  links:
    - url: https://example.com/alert
      title: Alerts
      icon: alert

And this is the result:

Using icons in plugin code

In the old frontend system, retrieve icons from the app context:

import { useApp } from '@backstage/core-plugin-api';

const app = useApp();
const alertIcon = app.getSystemIcon('alert');

This is useful when you have an icon that you want to render in several locations within a plugin.

note

If an icon key is not available as a default icon or one you have added, it falls back to Material UI's LanguageIcon.