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Set up and use portless for named local dev server URLs (e.g. https://myapp.localhost instead of http://localhost:3000). Use when integrating portless into a…
Portless Replace port numbers with stable, named .localhost URLs. For humans and agents. Why portless Port conflicts: EADDRINUSE when two projects default to the same port Memorizing ports: which app is on 3001 vs 8080? Refreshing shows the wrong app: stop one server, start another on the same port, stale tab shows wrong content Monorepo multiplier: every problem scales with each service in the repo Agents test the wrong port: AI agents guess or hardcode the wrong port Cookie/storage clashes: cookies on localhost bleed across apps; localStorage lost when ports shift Hardcoded ports in config: CORS allowlists, OAuth redirects, .env files break when ports change Sharing URLs with teammates: "what port is that on?" becomes a Slack question Browser history is useless: localhost:3000 history is a mix of unrelated projects Installation Install globally (recommended) or as a project dev dependency. Do NOT use npx or pnpm dlx for one-off execution.
don't have the plugin yet? install it then click "run inline in claude" again.