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sveltekit-data-flow

Guide SvelteKit data flow between server and client with load functions and form actions.

Updated Mar 28, 2026
Search Tags:#sveltekit#serialization#data-flow#load#form-action#invalidateAll
One-click install
npx skills add https://github.com/sandalsoft/agent-skills --skill sveltekit-data-flow-sandalsoft
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: sveltekit-data-flow
Source: https://github.com/sandalsoft/agent-skills/tree/main/sveltekit-data-flow
Command: npx skills add https://github.com/sandalsoft/agent-skills --skill sveltekit-data-flow-sandalsoft

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

SvelteKit data flow guidance helps developers design and implement robust server/client data interactions, including load functions, form actions, and invalidation, with clear guidance on +page.server.ts vs +page.ts, serialization, fail(), redirect(), error(), and invalidateAll().

Core Features & Use Cases

  • Clear patterns for choosing server vs universal loads and when to use +page.server.ts vs +page.ts.
  • Practical form action guidance using fail(), redirect(), and error() with serializable return values.
  • How to invalidate and refresh data across client navigation using invalidateAll() for responsive UIs.

Quick Start

Create a +page.server.ts for sensitive data, a +page.ts for universal data, and implement a simple load and a form action following the examples.

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?▼

SvelteKit load functions in +page.server.ts handle sensitive or server-only data, while +page.ts provides universal data fetching that runs on both server and client during navigation.

How do I handle form action errors and redirects in SvelteKit?▼

Handle SvelteKit form action errors and redirects by using fail() for validation issues with serializable data, redirect() for URL navigation, and error() to throw unexpected failures.

How do I refresh SvelteKit load data after a form action submission?▼

Refresh SvelteKit load data after a form action by calling invalidateAll() to re-run active load functions, ensuring the UI reflects updated server state without a full page reload.

What are the serialization constraints for SvelteKit form action return values?▼

SvelteKit form action return values must be fully serializable to safely move data from server to client, requiring plain JSON-compatible objects rather than class instances or functions.

Does SvelteKit data flow guidance cover safe data movement patterns across server and client?▼

Yes, SvelteKit data flow guidance provides patterns and guardrails for safe, predictable data movement across server and client, covering load functions, form actions, and invalidation techniques.

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