4 CLI Tools Every Developer Needs (That You've Never Heard Of)

Every developer has their toolkit. VS Code, Git, maybe a fancy terminal. But the best productivity gains come from tiny CLI tools that eliminate those 30-second annoyances you face 20 times a day. That's 10 minutes daily. 60 hours a year — gone to friction. I built 4 tools to fix that. They're small, open source, and npx-ready — meaning you can try them right now without installing anything. # Try any of these instantly npx @mj-muin/portguard npx @mj-muin/oops-cli npx @mj-muin/roast your-file.js npx @mj-muin/git-why your-file.js Let me walk you through each one. 1. 🛡️ portguard — Kill Port Zombies in One Command The Problem Error: listen EADDRINUSE: address already in use :::3000 Sound familiar? You lsof -i :3000, squint at the output, find the PID, then kill -9 it. Every. Single. Time. The Fix npx @mj-muin/portguard That's it. See what's running on your ports and kill it — one command. # List everything on common dev ports portguard list # Nuke whatever's on port 3000 portguard kill