VeeValidate: Vue Forms Without the Boilerplate

Why it exists

Building forms in Vue from scratch requires manually managing component state for values, errors, and touched statuses for every single field. This creates a lot of repetitive boilerplate code that is prone to errors, especially as forms grow in complexity with async validation and dynamic fields.

The mental model

VeeValidate is a dedicated state machine for your Vue forms. It provides a structured way to handle the entire form lifecycle: tracking user input, validating data against rules, managing error messages, and controlling the submission process. You declare your form's structure and rules, and VeeValidate handles the underlying state management.

How it works

VeeValidate offers two main approaches. First, a declarative component-based API using <Form> and <Field> components that wrap your native inputs or UI library components. Second, a composable function API with useForm and useField for more granular control, which is common in Vue 3's Composition API style. Both methods track field values, validation status, and errors, exposing them for you to display in your template.

When to use it

Use VeeValidate when you have any form beyond the most trivial. It excels in scenarios requiring complex validation logic, asynchronous validation (like checking if a username is taken), handling dynamic fields (like adding more items to a list), and integrating with UI libraries. Its devtools integration also makes debugging form state much easier.

When not to use it

For a single-field form with minimal validation (e.g., just a "required" check), VeeValidate might be overkill. If you're already using a comprehensive state management library for your entire application and have a simple form, you might choose to manage form state there, though VeeValidate is designed to be state-store friendly.

One canonical example

A user registration form. VeeValidate would manage the state for username, email, and password fields. It would run synchronous validation (e.g., "password must be 8 characters") and asynchronous validation (e.g., an API call to check if the email is already registered). It would disable the submit button until all fields are valid and handle displaying specific error messages next to each invalid field.