Vest Tutorials

Start with a small suite, or jump straight to the problem you are trying to solve. The examples cover focused validation, async checks, conditional fields, schemas, and sharing validation between the browser and server.

One API detail is worth knowing before you begin:

1. Use suite.run(data) for stateful application validation.
2. Use suite.runStatic(data) for an independent server request or isolated execution.
3. Pass the suite itself to a library that supports Standard Schema. The ~standard.validate hook is for those integrations, not for calling directly in application code.

Pick a tutorial

Tutorial	Example	What it covers
Write your first suite	Signup	create, test, enforce, and result selectors
Validate one field without forgetting the rest	Profile form	Focused runs and retained results
Handle async checks safely	Username availability	Pending state, cancellation, and race safety
Avoid repeated async work	Coupon check	memo, debounce, and AbortSignal
Show warnings without blocking submission	Password strength	Errors, warnings, pending, and untested state
Skip or remove conditional rules	Pickup and delivery	skipWhen, omitWhen, and optional
Validate a multi-step form	Onboarding	Groups, step validity, and cross-field rules
Parse input and keep the typed result	Registration	Parsing, type inference, and Standard Schema
Share validation between server and client	Server validation and browser resume	runStatic, serialization, and resumption
Write rules for your own domain	Custom Enforce rules	condition, enforce.extend, and sibling context

A good order for learning Vest

If Vest is new to you, read the first three in order. They introduce suites, focused runs, and async validation—the ideas most of the other guides build on. After that, choose the examples that match your application.

See everything working together

• Open the complete registration example for a runnable React application.
• Read Vest, schema validators, and form libraries to decide which tool should handle each part of your form.
• Check when not to use Vest if your validation is simple or only runs once.