sveltekit-data-flow

What problem does it solve?

Managing data flow in SvelteKit, especially between server and client, can be tricky. This skill demystifies load functions, form actions, and data serialization, helping you build robust applications that handle data efficiently and securely.

Core Features & Use Cases

• Load Functions: Understand when to use +page.server.ts for server-only data (e.g., database access, secrets) versus +page.ts for universal data (e.g., browser APIs, client-side fetches).
• Form Actions: Implement secure and user-friendly form submissions with fail(), redirect(), and error() for validation, navigation, and error handling.
• Data Serialization: Learn what data types can safely pass between server and client, preventing common serialization errors.
• Use Case: Implement a user login form that validates input, authenticates on the server, and redirects to a dashboard upon success, all while ensuring sensitive data remains server-side.

Quick Start

Explain the difference between +page.server.ts and +page.ts for loading data. Show me how to handle form validation errors using fail() in a SvelteKit form action.