This project puts together two things that should probably never go together:
embedded system filesystems, and web-side javascript.

The result is a fully functional javascript API for littlefs, complete with simulated block devices. This was all built using emscripten, a backend for the LLVM that can compile C to javascript. There's no smoke and mirrors here, this is actually running littlefs in your browser.

littlefs - https://github.com/geky/littlefs
emscripten - https://github.com/kripken/emscripten

So you want to see littlefs running in your browser? Just follow this link to the demo!
https://littlefs.geky.net/demo.html

You can find the full implementation of the demo in demo.html.