react-router-jam is a routing library designed specifically for React Router v7 and Remix frameworks. It provides a file-system/folder-based approach to routing that replaces traditional flat file structures with intuitive folder-based conventions. The library supports both TypeScript (.tsx, .ts) and JavaScript (.jsx, .js) file formats, making it versatile for different development setups.

Key features include folder-based routing that allows defining routes naturally through directory structures, nested layouts that create shared UI hierarchies effortlessly with layout.tsx files, and support for dynamic routes using square brackets [param] for parameter handling. The library also supports splat routes with [...param] syntax for catch-all paths, route groups using _folder naming convention for organizing files without affecting URL paths, and not-found routes for handling 404 errors within specific directory scopes.

The library works by scanning your file system structure in the routes directory and automatically generating routes based on predefined conventions. It uses minimatch for glob pattern matching to handle ignored file patterns. Routes are matched in order of specificity with static routes taking precedence over dynamic segments, which in turn take precedence over splat/catch-all routes.

Benefits include simplified route management through intuitive folder structures, automatic colocation capabilities that allow keeping components, styles, and tests alongside routes, and flexible configuration options for customizing routing behavior. The library enables developers to create complex routing hierarchies while maintaining clean, organized codebases.

Target users are React developers working with React Router v7 or Remix frameworks who need a more intuitive routing solution. The library integrates seamlessly with existing React Router v7 and Remix applications and requires minimal configuration to get started.