Vuelidate is a simple, lightweight, and powerful model-based validation library for Vue.js, supporting both versions 2 and 3.

The main features of this tool include:

• Model-Based Validation: It is considered "model-based" because your validation rules are defined directly next to your data, and the structure of the validation tree matches the structure of your data model.

• Broad Vue Compatibility: Vuelidate v2.0 supports both Vue 3.0 and Vue 2.x. For older versions of Vue (< 2.7), it can be used in conjunction with the @vue/composition-api plugin.

• Flexible API Support: It integrates seamlessly with the Options API (using the validations property) and the Composition API (via the useVuelidate hook).

• State-Driven Errors: Validation state is exposed through a central v$ object, allowing you to check for errors globally or for specific properties (e.g., v$.firstName).

• Detailed Error Reporting: When a validation fails, it provides an $errors array containing objects that describe each specific error, which can be used to dynamically build error messages in your templates.

• Easy Integration: It can be installed via standard package managers or used directly in the browser via a CDN without a bundler.

• Headless Nature: As a model-based library, it focuses on the logic of validation rather than the UI, giving you full control over how errors are displayed to the user.