I Want To Have a Toggle Switch For Dark & Light theme, How Do i Do it ?.

[dziraf]

You can for example override SidebarFooter: componentLoader.override('SidebarFooter', <path to your file>)

SidebarFooter:

import React, { useCallback } from 'react';
import { useCurrentAdmin } from 'adminjs';
import axios from 'axios';
import { Box, Button, Icon } from '@adminjs/design-system';
import { styled, useTheme } from '@adminjs/design-system/styled-components';

const SidebarFooter: React.FC = () => {
  const [currentAdmin, setCurrentAdmin] = useCurrentAdmin();
  const theme = useTheme();

  const toggleTheme = useCallback(async () => {
    try {
      const theme = currentAdmin.theme === 'light' ? 'dark' : 'light';
      const response = await axios.put('/app/me', { theme });

      const { updated, session } = response.data;
      if (updated) {
        setCurrentAdmin(session);
        window.location.reload();
      }
    } catch (err) {
      console.error(err);
    }
  }, [currentAdmin]);

  const icon = currentAdmin.theme === 'dark' ? 'Sun' : 'Moon';

  return (
    <Box mt="lg" mb="md" data-css="sidebar-footer">
      <Box flex justifyContent="center" mb="xl">
        <ToggleButton onClick={toggleTheme} size="icon">
          <Icon icon={icon} size={24} color={theme.colors.text} />
        </ToggleButton>
      </Box>
    </Box>
  );
};

export default SidebarFooter;

This will handle the frontend, but you need to add a new adminjs endpoint which modifies your user's session.

Express example (a file where you create AdminJS router):

  const router = ExpressPlugin.buildAuthenticatedRouter(
    admin,
    // other settings
  );

  router.put('/me', (request, response) => {
    const body = (request as any).fields ?? {};
    const admin = { ...((request.session as any).adminUser ?? {}) };

    let sessionUpdated = false;
    // It's better to set all relevant values manually to avoid malforming the session object
    if (body.theme) {
      admin.theme = body.theme;

      (request.session as any).adminUser = admin;
      request.session.save();
      sessionUpdated = true;
    }

    return response.send({
      session: admin,
      updated: sessionUpdated,
    });
  });

https://github.com/SoftwareBrothers/adminjs-themes/assets/16668924/db873174-3fe9-4d25-9d8b-f60e8a64f8ad