How can I handle async validation errors in Vue.js?

How can I handle async validation errors in Vue.js?

You can handle async validation errors in Vue.js by using libraries like VeeValidate or implementing custom validation logic.

Can you show me an example of using VeeValidate for async validation?

Sure! Here's a simple example:

import { required, email } from 'vee-validate/dist/rules';
import { extend } from 'vee-validate';

extend('required', required);
extend('email', email);

const validateEmail = async (value) => {
  const response = await fetch(`/api/check-email?email=${value}`);
  const data = await response.json();
  return data.isAvailable;
};

extend('emailAvailable', {
  validate: validateEmail,
  message: 'Email is already taken.'
});

What if I want to show a custom error message?

You can customize the error message by passing a message property in the extend function. For example:

extend('emailAvailable', {
  validate: validateEmail,
  message: 'This email is already in use, please choose another one.'
});