When working on large Svelte or SvelteKit projects, it's important to organize your code for maintainability, scalability, and clarity. A well-structured project separates concerns, makes components reusable, and organizes routes, stores, and utilities effectively.
Use the SvelteKit file-based routing system to organize pages. Nested folders create nested routes. Use `+page.svelte` for the page component and `+page.js` or `+page.server.js` for data loading.
Keep reusable UI elements in the `lib/components/` folder. Break complex UI into smaller, self-contained components. Use `bind:this` or props to communicate with parent components when needed.
Centralize shared state in `lib/stores/`. Use writable, readable, or derived stores for reactive state management. Keep stores small and focused to avoid coupling unrelated features.
Put reusable functions, formatters, or constants in `lib/utils/`. This helps reduce duplication and keeps your logic modular.
Use scoped styles inside components or global CSS in `src/app.css`. For larger projects, consider CSS modules, TailwindCSS, or Svelte preprocessors for consistent styling.