Premade validation functions
The @mantine/form package exports several functions that can be used in validation rules object . Validation functions are tiny in size and provide basic validation. If you have complex validation requirements, use other types of validation .
The last argument of all validator functions below is optional. If the error is not set, then fields with failed validation will only have invalid styles without an error message:
isNotEmpty checks that the form value is not empty. Empty string, empty array, false , null and undefined values are considered to be empty. Strings are trimmed before validation.
isEmail uses /^\w+([.-]?\w+)*@\w+([.-]?\w+)*(\.\w{2,})+$/ regexp to determine whether the form value is an email:
matches checks whether the form value matches the given regexp. If the form value is not a string, validation will fail.
isInRange checks whether the form value is within the given min - max range. If the form value is not a number, validation will fail.
hasLength checks whether the form value length is within the given min - max range. hasLength will work correctly with strings, arrays and any other objects that have a length property. Strings are trimmed before validation.
matchesField checks whether the form value is the same as the value in another form field. Note that matchesField can only work with primitive values (arrays and objects cannot be compared).
isJSONString checks whether the form value is a valid JSON string.
isUrl checks whether the form value is a valid URL. By default, only http and https protocols are allowed and localhost is rejected. You can customize this behavior by passing options as the first argument.
isOneOf checks whether the form value is included in the given list of allowed values. Uses strict equality for comparison.
isNotEmptyHTML checks that the form value is not an empty HTML string. Empty string, string with only HTML tags and whitespace are considered to be empty.
Form schema validation