Run it before it's live

This lesson is optional. You will see every change on a Netlify preview link from module 5 on. But a pull request that does not build cannot be previewed, so it helps to know how Claude checks the build and what to do when it fails.

Claude Code on the web runs in its own computer in the cloud. It can install the site and run npm run build, the same command Netlify runs. If the build passes there, it will almost always pass on Netlify too. You never need Node on your own machine.