# 10 SvelteKit Tips for Better Development SvelteKit is a powerful framework for building web applications with Svelte. Here are 10 tips to help you get the most out of SvelteKit in your projects. ## 1. Leverage File-based Routing SvelteKit's file-based routing makes it easy to create new pages. Just add a new file in the `src/routes` directory: ``` src/ routes/ blog/[slug]/ -> /blog/hello-world api/items/ -> /api/items # Check out the 'Meet the Developer' section on the homepage ``` ## 2. Use Server-side Rendering (SSR) Effectively SvelteKit supports multiple rendering modes. Use the `+page.server.ts` for server-side logic: ```typescript // src/routes/blog/[slug]/+page.server.ts export const load = async ({ params }) => { const post = await getPostFromDatabase(params.slug); return { post }; }; ``` ## 3. Optimize Loading States Show loading states during data fetching with the `$page.data` store: ```svelte {#if $page.status === 'loading'}

{:else} {/if} ``` ## 4. Handle Form Submissions SvelteKit makes form handling a breeze with form actions: ```svelte export const actions = { create: async ({ request }) => { const data = await request.formData(); const title = data.get('title'); // Save to database return { success: true }; } }; ``` ## 5. Use Environment Variables Securely Access environment variables on the server side: ```typescript // .env VITE_API_URL=https://api.example.com // +page.server.ts export const load = () => { const apiUrl = import.meta.env.VITE_API_URL; // Use apiUrl }; ``` ## 6. Implement Authentication Use hooks for authentication: ```typescript // src/hooks.server.ts import { redirect } from '@sveltejs/kit'; export const handle = async ({ event, resolve }) => { const session = await getSession(event.cookies.get('sessionid')); if (!session && !event.url.pathname.startsWith('/login')) { throw redirect(303, '/login'); } return resolve(event); }; ``` ## 7. Optimize Images Use the `@sveltejs/enhanced-img` for optimized images: ```svelte

``` ## 8. Handle Errors Gracefully Create custom error pages in `src/routes/error.svelte`: ```svelte

{status} Error

{error}

``` ## 9. Use Stores for Global State Create a store for shared state: ```typescript // src/stores/auth.ts import { writable } from 'svelte/store'; export const user = writable(null); // In your component: import { user } from '$lib/stores/auth'; // Set user user.set({ name: 'John' }); // Subscribe const unsubscribe = user.subscribe(value => { console.log('User:', value); }); ``` ## 10. Deploy with Adapters Choose the right adapter for your deployment target: ```bash # For Vercel npm i -D @sveltejs/adapter-vercel # For Netlify npm i -D @sveltejs/adapter-netlify # For Node.js npm i -D @sveltejs/adapter-node ``` Update your `svelte.config.js`: ```javascript import adapter from '@sveltejs/adapter-vercel'; export default { kit: { adapter: adapter() } }; ``` ## Conclusion These tips should help you build better applications with SvelteKit. The framework's flexibility and performance make it an excellent choice for projects of all sizes. Happy coding! ## 2. Leverage Stores for State Management For global state, use Svelte stores: ```javascript // store.js import { writable } from 'svelte/store'; export const theme = writable('light'); ```

10 SvelteKit Tips for Better Development

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