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Hot Reload / HMR

Seeing your code changes instantly in the browser without a full page refresh or losing state.

The Full Picture

Hot Module Replacement (HMR) automatically updates your running app when you save a file, without a full page reload. It preserves component state (form inputs, scroll position) so you can iterate rapidly. Next.js, Vite, and most modern frameworks include HMR out of the box.

Combined with vibe coding, HMR creates an incredibly tight feedback loop: prompt AI → save → see changes instantly → prompt again.

Related Terms

Server Components (RSC)

React components that run only on the server — no client-side JavaScript, smaller bundles, direct DB access.

Tailwind CSS

A utility-first CSS framework where you style elements using predefined classes directly in your HTML.

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