Browser FS Access API Ponyfill

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library 0.38.0 ·javascript
verified May 27, 2026

browser-fs-access is a JavaScript library that provides a simplified, progressive enhancement approach to using the File System Access API in web browsers. It acts as a ponyfill, meaning it offers a consistent API surface while transparently falling back to older, less capable methods like `<input type="file">` and `<a download>` on browsers that do not fully support the File System Access API. This ensures broad compatibility while leveraging modern capabilities where available. The library is currently at version 0.38.0 and maintains an active release cadence, frequently publishing updates and fixes, often on a monthly basis. Key differentiators include its robust fallback mechanism, its origin from GoogleChromeLabs, and its focus on developer ergonomics by abstracting away the complexities of feature detection and legacy API interactions. It ships with TypeScript types for improved developer experience.

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