Is Remix.js a framework or a library?

A framework provides a complete structure and set of conventions to build an application.

Remix.js is a Framework because:

1. Routing and File-Based Structure

• Uses a file-based routing system
• Provides nested routes, layout routing, and error boundaries as core concepts.

2. Data Handling

• Has a build-in data loader system via loader() and action() functions, which lets you manage server-side rendering and from submissions declaratively.

3. Full Stack Capabilities

• Remix.js is full stack: it manages both frontend and backend logic (including fetching, mutations, and authentication).
• Can be deployed on many backends: Express, Vercel, Cloudflare Workers, etc.

4. Build-in Optimization

• Provides intelligence resource preloading, streaming and caching out-of-the-box.

5. Opinionated Project Structure

• Remix.js dictates how your app should be structured (e.g., /routes, /app), which is a sign of a framework, not just a resuable library.

Summary:

• Remix.js is a framework – specifically a modern, full-stack, React-based web framework designed for performance and developer experence.