How to Run Your App Locally Inside Antigravity (Step by Step) 2026

Quick guide on using Antigravity’s built‑in browser preview to run your app locally. I show you how to open the preview window, start your local server, check if Node.js is installed, and use common commands like npm start or npm run dev to launch your project. You’ll also see how to view your live localhost URL, test your app, and let the agent interact with it automatically for functionality checks. When you're done, you can stop the server with Ctrl + C to shut everything down cleanly. Tags antigravity, localserver, localhost, browserpreview, claude, claudeai, nodejs, npm, devserver, codingworkflow, development, techguide, tutorial, stepbystep, productivity, workflow, webdevelopment, livepreview, agenttools, automation, testing, qa, codingprojects, creatorworkflow, efficiency, techsetup, howto, guide, webapp, frontenddev