jimmywarting/StreamSaver.js

Health v2 · maintenance only

Adoption not part of the score

4367 stars · 443 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

StreamSaver.js is a JavaScript library that lets browser apps write a WritableStream directly to the user's file system, saving large files without buffering them in RAM. It works by emulating server download headers via a service worker, making it ideal for streaming client-generated data to disk.

Use cases

• save large files in the browser without running out of memory
• stream generated data directly to a file on disk
• download client-generated content as a file
• write a readable stream to the filesystem asynchronously
• save big exports from a web app on devices with limited RAM

When to choose

• you need to save large or streamed data to disk in the browser without loading it all into memory
• the content is generated client-side and can't be served with download headers from a server
• you need broad browser support for streaming file saves today

When to avoid

• the file already lives on a server - use proper Content-Disposition response headers instead
• you only need to save small blobs - FileSaver.js is simpler
• your target browsers support the native File System Access API and you don't need legacy coverage

Facets

library · maturity maintenance

file-system streaming file-upload web-development frontend files browser streams service-worker filesaver large-files client-side web-server

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