Find and stop forgotten localhost dev servers on your Mac
List every dev server still running on your Mac with its port, uptime, memory and folder, then stop the ones you forgot. One command, tested on macOS 26.
2 tested guides, grouped by what is actually going on. Covers: Xcode space, Homebrew, ports, Terminal.
List every dev server still running on your Mac with its port, uptime, memory and folder, then stop the ones you forgot. One command, tested on macOS 26.
Fix EADDRINUSE on port 3000 (or 5173, 8080) on a Mac: one lsof command shows the process and its project folder, then stop it safely. Tested on macOS 26.
Every step is done on a MacBook Pro 14" (M1 Pro, 16 GB) before it is published. The Mac, the macOS version and the date sit at the top of each guide.
macOS settings, Finder and Terminal come first. An app is mentioned only when it really solves the problem, and our own apps are labelled.
Each guide links to Apple Support or the tool maker's docs, so you can confirm the steps yourself.
Guides are dated. When a guide is six months old it is flagged for a re-test on the current macOS.