How to fix A Suspense boundary must have a fallback or be inside another Suspense boundary in React

import { Suspense } from 'react';

function App() {
  return (
    <Suspense fallback={<div>Loading...</div>}>
      <YourAsyncComponent />
    </Suspense>
  );
}

import { Suspense } from 'react';

function App() {
  return (
    <Suspense fallback={
      <div className="flex items-center justify-center p-8">
        <div className="animate-spin h-8 w-8 border-4 border-blue-500 border-t-transparent rounded-full" />
      </div>
    }>
      <LazyComponent />
    </Suspense>
  );
}

function App() {
  return (
    <Suspense fallback={<AppLevelLoader />}>
      <Header />
      <MainContent />
      {/* This Suspense can have its own fallback or inherit from parent */}
      <Suspense fallback={<SectionLoader />}>
        <AsyncSection />
      </Suspense>
    </Suspense>
  );
}

import { Suspense, lazy } from 'react';

const LazyDashboard = lazy(() => import('./Dashboard'));

function App() {
  return (
    <Suspense fallback={<div>Loading Dashboard...</div>}>
      <LazyDashboard />
    </Suspense>
  );
}

const LazyProfile = lazy(() => import('./Profile'));
const LazySettings = lazy(() => import('./Settings'));

function App() {
  return (
    <Suspense fallback={<PageLoader />}>
      <Routes>
        <Route path="/profile" element={<LazyProfile />} />
        <Route path="/settings" element={<LazySettings />} />
      </Routes>
    </Suspense>
  );
}

import useSWR from 'swr';
import { Suspense } from 'react';

function Profile() {
  // suspense: true makes this hook suspend
  const { data } = useSWR('/api/user', fetcher, { suspense: true });
  return <div>{data.name}</div>;
}

function App() {
  return (
    <Suspense fallback={<div>Loading profile...</div>}>
      <Profile />
    </Suspense>
  );
}

import { useSuspenseQuery } from '@tanstack/react-query';
import { Suspense } from 'react';

function Posts() {
  const { data } = useSuspenseQuery({
    queryKey: ['posts'],
    queryFn: fetchPosts,
  });
  return <PostList posts={data} />;
}

function App() {
  return (
    <Suspense fallback={<div>Loading posts...</div>}>
      <Posts />
    </Suspense>
  );
}

npm list react react-dom

npm install react@latest react-dom@latest

// React 18 with concurrent features
import { createRoot } from 'react-dom/client';

const root = createRoot(document.getElementById('root'));
root.render(
  <Suspense fallback={<div>Loading app...</div>}>
    <App />
  </Suspense>
);