Building Browser-to-Browser File Transfer with WebRTC: What I Learned Building TransP2P

TL;DR: I built a P2P file transfer tool that runs entirely in the browser. No install, no server relay, no account. Here's what I learned about WebRTC data channels, resumable transfers, and the browser storage mess along the way. Most file transfer tools follow the same pattern: upload to a server, get a link, the recipient downloads from that server. Your file sits on someone else's infrastructure, at least for a while. I wanted to try a different approach: what if the file never leaves the br