App.js

import React from 'react';
import ReactDOM from 'react-dom';
import { BrowserRouter, Route, Switch } from 'react-router-dom';
import Chat from './Chat/Chat';
import AdminChat from './Admin/AdminChat';
const App = () => {
    return (
        <BrowserRouter>
            <div>
                <Switch>
                    <Route exact path='/' component={Chat} />
                    <Route exact path='/admin' component={AdminChat} />
                </Switch>
            </div>
        </BrowserRouter>
    );
}

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