FileSystem & FileWriter API

Filesystem API provides a method of reading and writing files to a sandboxed file system on the user's local file system.

Verdict

Avoid

Category

JavaScript APIs

Browser support

Can I Use

Works in

all modern browsers

Should you use FileSystem & FileWriter API in 2026?

Supported only by Chrome 18+ with webkit prefix. Check out https://caniuse.com/#feat=filesystem for a better understanding of the support.

idb.filesystem.js Implements a polyfill using IndexedDB as its underlying storage layer. Required support for IndexDB means that it works only in Firefox and Chrome.

Polyfills and fallbacks

idb.filesystem.js

Browser share on Can I Use Edit on GitHub