How do I see all running dev servers on my Mac?

Run lsof -nP -iTCP -sTCP:LISTEN in Terminal to list every listening port and its PID, then kill the PID to stop one. Menu bar port apps or Dhiru from Spritefolk keep watch for you.

Dhiru · dev watch

How to keep track of running dev servers and ports on Mac

Old dev servers pile up: Next.js moves to 3001, Vite to 5174, and soon nothing is where you expect. Here's how to see them all.

One command

lsof -nP -iTCP -sTCP:LISTEN

Every app listening on a port, with its PID. Stop one with kill <PID>. Full walkthrough: see what's running on a port.

Keep an eye on it

Menu bar port apps: several free, open-source apps list listening ports in the menu bar with a kill button, for example Manfath and Seeports.
Activity Monitor: shows processes and CPU, but not ports.
On your desktop: Dhiru, from Spritefolk. A tortoise with a laptop who notices the dev servers you've left running, shows what's hogging your CPU, checks your internet speed and can keep your Mac awake.

Port by port: 3000, 3001, 3306, 4000, 4200, 4321, 5000, 5173, 5432, 5555, 6006, 6379, 7000, 8000, 8080, 8081, 8787, 8888, 9000, 9229, 27017