djalmaaraujo/piper

Piper is a command line tool that lets you run a command normally in your terminal while also streaming its live output over HTTP, so anyone with the link can watch it happen in real time, either in a browser or with curl. A common use is watching a long build, a deployment, or a test run from another device or with a teammate, without needing to be sitting at the same terminal. When you run a command through piper, it prints output to your terminal as usual and also starts serving that same output on a local web address by default, which you can open in a browser to see a dark, auto scrolling log page, or fetch as a raw stream with curl. Multiple people can watch the same stream at once, and anyone who joins late still gets the last 100 lines of output before the live stream continues. Because it runs your command through something called a pseudo terminal, colors and progress bars still display correctly, unlike some tools that break formatting. By default the stream only reaches your own machine, but adding a flag opens it up to your local network, and a separate public sharing option can automatically detect and use a tunneling tool like Tailscale, Cloudflare, or ngrok to make it reachable from anywhere on the internet. You can also run several piper streams at once, they share a single port and each gets its own unique address, with an index page of everything running kept hidden unless you turn it on. On a Mac, piper can additionally share a specific window on your screen as a live streamed image, after you grant screen recording permission. Piper ships as a single, dependency free binary written in Go, and installs through Homebrew or a one line install script. It carries the MIT license, meaning anyone can use, modify, and share it freely.