react-window
React component library for efficiently rendering large lists and tabular data by only rendering visible items (virtual windowing). Renders only the DOM nodes currently visible in the viewport, regardless of total list size. Handles fixed and variable-size rows/columns. The standard solution for rendering 1000+ item lists in React without performance degradation. Successor to react-virtualized (same author, lighter API).
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Client-side rendering library — no network calls or data persistence. No security concerns beyond standard XSS in rendered content.
⚡ Reliability
Best When
You have long scrolling lists (1000+ items) or large data grids where rendering all items causes performance issues.
Avoid When
Your list has fewer than a few hundred items — native rendering is simpler and performs fine at small scales.
Use Cases
- • Render large lists (1000+ items) in React without performance issues by virtualizing the DOM to only visible items
- • Build virtual scrolling data tables with thousands of rows where native HTML table rendering would cause jank
- • Implement infinite scroll UIs where items are rendered as the user scrolls without mounting all items upfront
- • Display large file trees, search results, or feed items where mounting all DOM nodes causes memory and rendering issues
- • Build virtual grids for spreadsheet-like displays with many rows and columns using FixedSizeGrid or VariableSizeGrid
Not For
- • Lists with fewer than 200-500 items — virtualization overhead isn't worth it for small lists
- • Variable-height items without known dimensions upfront — requires manual height estimation or measurement
- • Complex interactive cells needing frequent re-renders — virtualization can complicate item recycling with stateful items
Interface
Authentication
No authentication — client-side React library.
Pricing
MIT licensed. Maintained by Brian Vaughn (ex-Facebook React team). Completely free.
Agent Metadata
Known Gotchas
- ⚠ react-window requires fixed item sizes for FixedSizeList/Grid — variable height lists need VariableSizeList with itemSize callback that must return heights accurately
- ⚠ Item components must not manage their own scroll state — react-window manages scrolling; item state should live in parent data structures
- ⚠ The itemData prop must be memoized — passing new references on every render causes all visible items to re-render
- ⚠ react-window does not support auto-sizing to content — container must have explicit height/width set
- ⚠ Scrolling to specific items requires the ref API (listRef.current.scrollToItem) — imperative scrolling, not declarative
- ⚠ react-window has not had a major update since 2019 — consider TanStack Virtual for new projects with more active maintenance
Alternatives
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Scores are editorial opinions as of 2026-03-06.