Async Validation Guide

This page is coming soon as part of the documentation restructure.

Learn how to implement debounced server-side validation with El Form.

Basic Async Validation

const form = useForm({
  fieldValidators: {
    email: {
      onChangeAsync: async (value) => {
        if (!value) return { isValid: true };

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

        return {
          isValid: !data.exists,
          errors: data.exists ? { email: "Email already taken" } : undefined,
        };
      },
    },
  },
});

Full async validation guide with debouncing and error handling is coming soon.