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web development, streamlined
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Easily add integrations and other functionality to Svelte(kit) apps
web development for the rest of us
🤖 Headless, performant, and type-safe form state management for TS/JS, React, Vue, Angular, Solid, and Lit.
📋 React Hooks for form state management and validation (Web + React Native)
Quick Overview
SvelteKit Superforms is a library that enhances form handling in SvelteKit applications. It provides a robust solution for client and server-side form validation, offering a seamless experience for developers working with forms in SvelteKit projects.
Pros
- Seamless integration with SvelteKit and its form actions
- Supports both client-side and server-side validation
- Provides TypeScript support for improved type safety
- Offers a simple API for complex form handling scenarios
Cons
- Requires additional setup and configuration compared to native form handling
- May have a learning curve for developers new to the library
- Could potentially increase bundle size for smaller applications
- Limited to SvelteKit projects, not usable in vanilla Svelte applications
Code Examples
- Basic form setup:
import { superForm } from 'sveltekit-superforms/client';
import type { SuperValidated } from 'sveltekit-superforms';
import { z } from 'zod';
const schema = z.object({
email: z.string().email(),
password: z.string().min(8)
});
export const load = async () => {
const form = await superForm(schema);
return { form };
};
- Form validation in a Svelte component:
<script lang="ts">
import { superForm } from 'sveltekit-superforms/client';
export let data;
const { form, errors, enhance } = superForm(data.form);
</script>
<form method="POST" use:enhance>
<input name="email" bind:value={$form.email}>
{#if $errors.email}<span class="error">{$errors.email}</span>{/if}
<input name="password" type="password" bind:value={$form.password}>
{#if $errors.password}<span class="error">{$errors.password}</span>{/if}
<button>Submit</button>
</form>
- Server-side form handling:
import { superValidate } from 'sveltekit-superforms/server';
export const actions = {
default: async ({ request }) => {
const form = await superValidate(request, schema);
if (!form.valid) {
return fail(400, { form });
}
// Process the valid form data
return { form };
}
};
Getting Started
-
Install the library:
npm install sveltekit-superforms zod -
Create a schema and load function in your route file:
import { superForm } from 'sveltekit-superforms/client'; import { z } from 'zod'; const schema = z.object({ /* your schema */ }); export const load = async () => { const form = await superForm(schema); return { form }; }; -
Use the form in your Svelte component:
<script lang="ts"> import { superForm } from 'sveltekit-superforms/client'; export let data; const { form, errors, enhance } = superForm(data.form); </script> <form method="POST" use:enhance> <!-- Your form fields here --> </form>
Competitor Comparisons
web development, streamlined
Pros of Kit
- Core SvelteKit framework with comprehensive documentation and community support
- Integrated routing, server-side rendering, and API endpoints
- Regular updates and maintenance from the Svelte core team
Cons of Kit
- Steeper learning curve for beginners
- Requires more setup and configuration for form handling
- Less specialized features for form management and validation
Code Comparison
Kit (basic form handling):
<form method="POST">
<input name="username" />
<button>Submit</button>
</form>
export const actions = {
default: async ({ request }) => {
const data = await request.formData();
// Process form data
}
};
Sveltekit-superforms:
<script>
import { superForm } from 'sveltekit-superforms/client';
const { form, errors, enhance } = superForm(data);
</script>
<form method="POST" use:enhance>
<input name="username" bind:value={$form.username} />
{#if $errors.username}<span>{$errors.username}</span>{/if}
<button>Submit</button>
</form>
Sveltekit-superforms provides a more streamlined approach to form handling with built-in validation and error management, while Kit offers a more flexible but less specialized foundation for building web applications.
open file format for localizing software (i18n)
Error generating comparison
Easily add integrations and other functionality to Svelte(kit) apps
Pros of svelte-add
- Broader scope: Adds various integrations to Svelte projects, not limited to form handling
- Customizable: Allows selecting specific features to add
- Community-driven: Accepts contributions for new integrations
Cons of svelte-add
- Less specialized: May not provide as deep form functionality as Superforms
- Potentially more complex setup: Requires choosing and configuring multiple integrations
- Maintenance challenges: With many integrations, keeping all up-to-date can be difficult
Code Comparison
svelte-add (adding TailwindCSS):
npx svelte-add@latest tailwindcss
Superforms (basic setup):
import { superForm } from 'sveltekit-superforms/client';
const { form, errors, enhance } = superForm(data);
While svelte-add focuses on adding various integrations to Svelte projects, Superforms specializes in form handling for SvelteKit. svelte-add offers flexibility and a wide range of options, but Superforms provides a more focused and potentially more robust solution for form management. The choice between them depends on whether you need a general-purpose tool for adding features or a specialized form handling library.
web development for the rest of us
Pros of Svelte
- Core framework with broader application beyond form handling
- Larger community and ecosystem for general Svelte development
- More comprehensive documentation and learning resources
Cons of Svelte
- Lacks specialized form handling features out of the box
- Requires additional setup and custom code for advanced form functionality
- May need third-party libraries for complex form validation and processing
Code Comparison
Svelte (basic form handling):
<script>
let name = '';
function handleSubmit() {
// Handle form submission
}
</script>
<form on:submit|preventDefault={handleSubmit}>
<input bind:value={name} />
<button type="submit">Submit</button>
</form>
Sveltekit-superforms:
<script>
import { superForm } from 'sveltekit-superforms/client';
const { form, errors, enhance } = superForm(data.form);
</script>
<form method="POST" use:enhance>
<input name="name" bind:value={$form.name} />
{#if $errors.name}<span class="error">{$errors.name}</span>{/if}
<button>Submit</button>
</form>
The code comparison shows that Sveltekit-superforms provides a more streamlined approach to form handling with built-in error management and enhancement features, while Svelte requires more manual setup for similar functionality.
🤖 Headless, performant, and type-safe form state management for TS/JS, React, Vue, Angular, Solid, and Lit.
Pros of TanStack Form
- Framework-agnostic, works with React, Vue, Solid, and more
- Advanced features like form arrays and nested fields
- Extensive documentation and community support
Cons of TanStack Form
- Steeper learning curve due to its flexibility and complexity
- Requires more setup and configuration compared to SvelteKit-superforms
- Not specifically optimized for SvelteKit, may require additional integration work
Code Comparison
SvelteKit-superforms:
import { superForm } from 'sveltekit-superforms/client';
const { form, errors, enhance } = superForm(data);
TanStack Form:
import { useForm } from '@tanstack/react-form';
const form = useForm({
defaultValues: { name: '', email: '' },
onSubmit: async (values) => {
// Submit logic
},
});
Summary
SvelteKit-superforms is tailored for SvelteKit applications, offering a simpler setup and integration process. It provides a more streamlined experience for SvelteKit developers but may lack some advanced features.
TanStack Form, on the other hand, is a versatile solution that works across multiple frameworks. It offers more advanced features and flexibility but requires more setup and may have a steeper learning curve. The choice between the two depends on the specific project requirements and the developer's familiarity with the frameworks.
📋 React Hooks for form state management and validation (Web + React Native)
Pros of react-hook-form
- Widely adopted in the React ecosystem with a large community
- Extensive documentation and examples available
- Supports complex form validation scenarios out of the box
Cons of react-hook-form
- Limited to React applications, not suitable for other frameworks
- Requires more boilerplate code for basic form setups
- Learning curve can be steeper for beginners
Code Comparison
react-hook-form:
import { useForm } from "react-hook-form";
const { register, handleSubmit } = useForm();
const onSubmit = data => console.log(data);
<form onSubmit={handleSubmit(onSubmit)}>
<input {...register("firstName")} />
<input type="submit" />
</form>
sveltekit-superforms:
<script>
import { superForm } from 'sveltekit-superforms';
const { form, errors, enhance } = superForm(data);
</script>
<form method="POST" use:enhance>
<input bind:value={$form.firstName} />
<button>Submit</button>
</form>
The code comparison shows that sveltekit-superforms offers a more concise syntax for basic form setup, while react-hook-form requires more explicit configuration. However, react-hook-form provides more granular control over form elements and validation.
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Superforms ð¥
Making SvelteKit forms a pleasure to use!
Feature list
- Server- and client-side validation with your favorite validation libraries, and more to come: ð¥ Arktype ð¥ class-validator ð¥ Effect ð¥ Joi ð¥ Superstruct ð¥ TypeBox ð¥ Valibot ð¥ VineJS ð¥ Yup ð¥ Zod ð¥ or use JSON Schema directly.
- Seamless merging of
PageDataandActionData- Forget about how to combine them, just focus on your form data, always strongly typed. - Auto-centering and focusing on invalid form fields.
- Tainted form detection, prevents the user from losing data if navigating away from an unsaved form. Or use snapshots to save the form state.
- Automatically coerces
FormDatainto correct types, including arrays and files. - For advanced data structures, forget about the limitations of
FormData- Post nested data structures like a RPC call. - Generates default form values from many validation schemas.
- Handles multiple forms on the same page.
- Works both on the server and with single-page applications (SPA)!
- Convenient handling and validation of file uploads, both on server and client and even in nested data.
- Proxy objects for handling data conversions to string and back again.
- Realtime client-side validation for the best possible UX.
- Create loading spinners easily with three auto-updating timers, based on human perception research.
- Hook into a number of events for full control over the validation data and the
ActionResult, with a possibility to cancel the update at every step. - Complete customization with a huge list of options.
- No JavaScript required as default, but full support for progressive enhancement.
- Comes with a Super Debugging Svelte Component: SuperDebug.
Get started
Follow the Get started tutorial on the website to get a hands-on introduction to Superforms: https://superforms.rocks/get-started
You can also watch this excellent introduction video to see what's possible: https://www.youtube.com/watch?v=MiKzH3kcVfs
Help & support
- If you're using Superforms in non-profit circumstances, support is completely free; a star on Github is more than enough to show your appreciation. Join the #free-support channel on Discord and ask away!
- If you're making or aiming to make money on your project, a donation proportional to the current profit of the project or the company you work for, will give you a month of commercial support. Donate with one of the options on the website, then ask in the #commercial-support channel on Discord.
Contributing
General feedback, feature requests, bug reports, PR:s, are very welcome as a Github issue or on the Discord server!
Donating
If you appreciate the hard work behind Superforms, please support open source software with a donation.
Top Related Projects
web development, streamlined
open file format for localizing software (i18n)
Easily add integrations and other functionality to Svelte(kit) apps
web development for the rest of us
🤖 Headless, performant, and type-safe form state management for TS/JS, React, Vue, Angular, Solid, and Lit.
📋 React Hooks for form state management and validation (Web + React Native)
Convert
designs to code with AI
Introducing Visual Copilot: A new AI model to turn Figma designs to high quality code using your components.
Try Visual Copilot

