Remix / React Router v7 Framework Patterns

Quick Guide: Each route exports a loader for reads and an action for writes. Both run on the server. Data flows through loaders, mutations go through actions, forms work without JavaScript, and nested routes enable parallel data loading. json() and defer() are deprecated in React Router v7 -- return raw objects instead, use data() for custom headers/status.

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IMPORTANT: React Router v7 Migration

Remix has merged into React Router v7. What was planned as Remix v3 is now React Router v7 "framework mode".