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sveltekit-data-flow

Explain SvelteKit load functions, form actions, and data serialization.

Updated Oct 14, 2025
Search Tags:#typescript#web development#data flow#sveltekit#load functions#form actions
One-click install
npx skills add https://github.com/kensleDev/dotfiles --skill sveltekit-data-flow-kensledev
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: sveltekit-data-flow
Source: https://github.com/kensleDev/dotfiles/tree/main/claude/.claude/skills/svelte/sveltekit-data-flow
Command: npx skills add https://github.com/kensleDev/dotfiles --skill sveltekit-data-flow-kensledev

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill clarifies the complexities of data flow within SvelteKit applications, ensuring efficient and correct handling of server and client-side data.

Core Features & Use Cases

  • Load Functions: Differentiates between server-only (+page.server.ts) and universal (+page.ts) load functions.
  • Form Actions: Guides on implementing form submissions, including validation, error handling (fail()), redirection (redirect()), and fatal error reporting (error()).
  • Serialization: Explains what data types can and cannot be passed between server and client.
  • Use Case: You're building a SvelteKit app and are unsure whether to use +page.server.ts or +page.ts for fetching user data, or how to properly handle form validation errors. This Skill provides clear answers and examples.

Quick Start

Use the sveltekit-data-flow skill to understand the difference between +page.server.ts and +page.ts load functions.

Frequently Asked Questions about sveltekit-data-flow

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
When should I use +page.server.ts vs +page.ts for SvelteKit load functions?▼

Use SvelteKit load functions in +page.server.ts for server-only data fetching, and +page.ts for universal loads that run on both server and client. Choosing the right file prevents sensitive data exposure and optimizes client-side navigation.

How do I handle form validation errors in SvelteKit form actions?▼

Handle form validation errors in SvelteKit form actions by returning the fail() function with your validation data. This returns the error payload to the client while preserving user input without triggering a full page reload.

What data types cannot be passed between server and client in SvelteKit?▼

SvelteKit data serialization cannot pass non-serializable types like class instances or functions between server and client. Data returned from load functions and form actions must be structured as JSON-compatible values.

What is the difference between fail(), error(), and redirect() in SvelteKit?▼

In SvelteKit, fail() returns form validation issues without changing the HTTP status, error() throws a fatal error rendering the error page, and redirect() immediately navigates the user to a new route.

Can I use SvelteKit form actions without JavaScript enabled?▼

Yes, SvelteKit form actions work without client-side JavaScript by relying on standard HTML form submissions. The server processes the action and returns the data, ensuring full progressive enhancement.

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