Infinite Scroll in React: react-infinite-scroll-component vs react-infinite-scroller vs react-window-infinite-loader

Infinite scrolling is a common pattern in modern web applications, letting users load more content as they scroll without pagination. But not all infinite scroll implementations are created equal. The three packages we're comparing — react-infinite-scroll-component, react-infinite-scroller, and react-window-infinite-loader — solve this problem in fundamentally different ways. Let's break down how they work and when to use each.

🏗️ Core Architecture: DOM Rendering vs Virtualization

react-infinite-scroll-component keeps all loaded items in the DOM.

• Every item you load stays rendered until you manually remove it.
• Simple to understand and debug.
• Performance degrades as the list grows beyond a few thousand items.

import InfiniteScroll from 'react-infinite-scroll-component';

function Feed() {
  const [items, setItems] = useState(initialItems);

  const fetchMoreData = () => {
    // Load more items and append to existing list
    setTimeout(() => {
      setItems([...items, ...moreItems]);
    }, 1000);
  };

  return (
    <InfiniteScroll
      dataLength={items.length}
      next={fetchMoreData}
      hasMore={true}
      loader={<h4>Loading...</h4>}
    >
      {items.map(item => (
        <div key={item.id}>{item.content}</div>
      ))}
    </InfiniteScroll>
  );
}

react-infinite-scroller also keeps all items in the DOM.

• Similar architecture to react-infinite-scroll-component.
• Offers more flexibility in scroll container configuration.
• Same performance limitations with large datasets.

import InfiniteScroll from 'react-infinite-scroller';

function Feed() {
  const [items, setItems] = useState(initialItems);

  const fetchMoreData = () => {
    setTimeout(() => {
      setItems([...items, ...moreItems]);
    }, 1000);
  };

  return (
    <InfiniteScroll
      pageStart={0}
      loadMore={fetchMoreData}
      hasMore={true}
      loader={<div key={0}>Loading...</div>}
    >
      {items.map(item => (
        <div key={item.id}>{item.content}</div>
      ))}
    </InfiniteScroll>
  );
}

react-window-infinite-loader uses virtualization.

• Only renders items currently visible in the viewport.
• Recycles DOM nodes as users scroll.
• Handles hundreds of thousands of items without performance issues.

import InfiniteLoader from 'react-window-infinite-loader';
import { FixedSizeList } from 'react-window';

function Feed({ items, loadMoreItems }) {
  const isItemLoaded = index => index < items.length;

  return (
    <InfiniteLoader
      isItemLoaded={isItemLoaded}
      itemCount={items.length + 1000}
      loadMoreItems={loadMoreItems}
    >
      {({ onItemsRendered, ref }) => (
        <FixedSizeList
          height={600}
          itemCount={items.length}
          itemSize={50}
          onItemsRendered={onItemsRendered}
          ref={ref}
        >
          {({ index, style }) => (
            <div style={style} key={items[index]?.id}>
              {items[index]?.content}
            </div>
          )}
        </FixedSizeList>
      )}
    </InfiniteLoader>
  );
}

📜 Scroll Container: Window vs Custom Element

react-infinite-scroll-component defaults to window scrolling.

• Can also work with custom scrollable elements using the scrollableTarget prop.
• Requires passing a ref to the scrollable parent element.

<InfiniteScroll
  dataLength={items.length}
  next={fetchMoreData}
  hasMore={true}
  scrollableTarget="scrollableDiv"
  loader={<h4>Loading...</h4>}
>
  <div id="scrollableDiv" style={{ height: '400px', overflow: 'auto' }}>
    {items.map(item => (
      <div key={item.id}>{item.content}</div>
    ))}
  </div>
</InfiniteScroll>

react-infinite-scroller gives explicit control over scroll target.

• Use useWindow prop to toggle between window and element scrolling.
• More straightforward API for custom containers.

<InfiniteScroll
  pageStart={0}
  loadMore={fetchMoreData}
  hasMore={true}
  useWindow={false}
  loader={<div key={0}>Loading...</div>}
>
  <div style={{ height: '400px', overflow: 'auto' }}>
    {items.map(item => (
      <div key={item.id}>{item.content}</div>
    ))}
  </div>
</InfiniteScroll>

react-window-infinite-loader always uses a custom container.

• Requires react-window list component (FixedSizeList, VariableSizeList, etc.).
• The list component manages its own scroll container.
• More setup but consistent behavior across environments.

<InfiniteLoader
  isItemLoaded={isItemLoaded}
  itemCount={itemCount}
  loadMoreItems={loadMoreItems}
>
  {({ onItemsRendered, ref }) => (
    <FixedSizeList
      height={600}
      width={400}
      itemCount={itemCount}
      itemSize={50}
      onItemsRendered={onItemsRendered}
      ref={ref}
    >
      {Row}
    </FixedSizeList>
  )}
</InfiniteLoader>

⚡ Performance: When DOM Size Matters

react-infinite-scroll-component works fine for small to medium lists.

• Acceptable performance up to ~1,000-2,000 items.
• Beyond that, you'll notice scrolling lag and increased memory usage.
• No built-in way to unload old items from the DOM.

// All items stay in DOM - memory grows with each load
{items.map(item => (
  <div key={item.id}>{item.content}</div>
))}

react-infinite-scroller has identical performance characteristics.

• Same DOM retention behavior as react-infinite-scroll-component.
• Performance bottleneck is the same — too many DOM nodes.
• You'd need to manually implement item removal for long sessions.

// Same issue - all rendered items persist
{items.map(item => (
  <div key={item.id}>{item.content}</div>
))}

react-window-infinite-loader maintains consistent performance.

• Only ~20-30 items rendered at any time regardless of total count.
• Memory usage stays flat even with 100,000+ items.
• Essential for data-heavy applications or long user sessions.

// Only visible items rendered - constant memory footprint
{({ index, style }) => (
  <div style={style} key={items[index]?.id}>
    {items[index]?.content}
  </div>
)}

🔄 Loading State Management

react-infinite-scroll-component uses a simple loader prop.

• Shows loader component when hasMore is true and loading.
• No built-in loading state tracking — you manage it yourself.

const [loading, setLoading] = useState(false);

const fetchMoreData = async () => {
  if (loading) return;
  setLoading(true);
  const newItems = await api.fetchMore();
  setItems([...items, ...newItems]);
  setLoading(false);
};

<InfiniteScroll
  dataLength={items.length}
  next={fetchMoreData}
  hasMore={hasMore}
  loader={loading ? <h4>Loading...</h4> : null}
/>

react-infinite-scroller similar loader pattern.

• Loader displays during loadMore execution.
• You still manage loading state manually.

const [loading, setLoading] = useState(false);

const fetchMoreData = async () => {
  if (loading) return;
  setLoading(true);
  const newItems = await api.fetchMore();
  setItems([...items, ...newItems]);
  setLoading(false);
};

<InfiniteScroll
  pageStart={0}
  loadMore={fetchMoreData}
  hasMore={hasMore}
  loader={loading ? <div key={0}>Loading...</div> : null}
/>

react-window-infinite-loader has built-in loading state.

• Tracks which items are loaded via isItemLoaded.
• Shows loader automatically for unloaded items.
• More sophisticated but requires understanding the loading contract.

const isItemLoaded = index => index < items.length;

const loadMoreItems = async (startIndex, stopIndex) => {
  const newItems = await api.fetchRange(startIndex, stopIndex);
  setItems(prev => [...prev, ...newItems]);
};

<InfiniteLoader
  isItemLoaded={isItemLoaded}
  itemCount={items.length + 1000}
  loadMoreItems={loadMoreItems}
>
  {({ onItemsRendered, ref }) => (
    <FixedSizeList
      height={600}
      itemCount={items.length}
      itemSize={50}
      onItemsRendered={onItemsRendered}
      ref={ref}
    >
      {Row}
    </FixedSizeList>
  )}
</InfiniteLoader>

🧩 Integration with react-window Ecosystem

react-infinite-scroll-component stands alone.

• No dependencies on other libraries.
• Easier to drop into existing projects.
• Missing advanced features like variable row heights.

// No additional dependencies needed
import InfiniteScroll from 'react-infinite-scroll-component';

react-infinite-scroller also standalone.

• Zero external dependencies beyond React.
• Simple to install and use.
• Limited to fixed-height items in practice.

// Also no additional dependencies
import InfiniteScroll from 'react-infinite-scroller';

react-window-infinite-loader requires react-window.

• Must install both react-window and react-window-infinite-loader.
• Gains access to full virtualization ecosystem.
• Supports variable row heights, grids, and more.

// Requires react-window as peer dependency
import InfiniteLoader from 'react-window-infinite-loader';
import { FixedSizeList, VariableSizeList } from 'react-window';

🛠️ Maintenance Status and Community Support

react-infinite-scroll-component is actively maintained.

• Regular updates and bug fixes.
• Good documentation with examples.
• Suitable for new projects with moderate data needs.

react-infinite-scroller has limited recent activity.

• Fewer updates in recent years.
• Still functional but consider alternatives for new projects.
• May lack support for newer React features.

react-window-infinite-loader is well-maintained.

• Part of the react-window ecosystem by Brian Vaughn.
• Regular updates aligned with react-window releases.
• Recommended for performance-critical applications.

📊 Feature Comparison Summary

💡 The Bottom Line

react-infinite-scroll-component is your go-to for simple infinite scroll needs. Use it for content feeds, comment sections, or search results where you expect users to load a few hundred items at most. It's easy to set up and works well for most common use cases.

react-infinite-scroller offers similar functionality with slightly more flexibility for custom scroll containers. However, given its limited recent maintenance, consider react-infinite-scroll-component instead for new projects unless you have specific requirements it addresses better.

react-window-infinite-loader is the performance champion. If you're building admin dashboards, analytics views, or any application where users might scroll through thousands of items, this is the only serious choice. The virtualization approach keeps your app responsive regardless of data volume.

Final Thought: The right choice depends on your data scale. For under 2,000 items, keep it simple with react-infinite-scroll-component. For anything larger, invest in virtualization with react-window-infinite-loader — your users' scrolling experience will thank you.