FieldValidationRules

Validates that the input is a valid credit card number. Checks length (13-16 digits) and applies Luhn algorithm validation.

creditCard: [true, 'Invalid credit card number']

Allows for completely custom validation logic as a function. This function receives the field value and should return either:

• A string containing an error message if validation fails
• null if validation passes

customValidator: (value) => {
  if (typeof value === 'string' && !value.includes('@company.com')) {
    return 'Email must be a company email';
  }
  return null;
}

Validates that the input can be parsed as a valid date. Uses Date.parse() to validate the string can be converted to a date.

date: [true, 'Please enter a valid date']

Validates that the input follows ISO date format (YYYY-MM-DD). Ensures strict compliance with the ISO date standard.

dateIso: [true, 'Date must be in YYYY-MM-DD format']

Validates that the input contains only numeric digits (0-9). Rejects inputs containing decimal points, signs, letter characters or spaces.

digits: [true, 'Please enter only numeric digits']

Validates that the input conforms to a standard email address format. Checks for proper formatting with @ symbol and domain structure.

email: [true, 'Please enter a valid email address']

Validates that the field's value exactly matches another field's value. Takes the name of another field as the first parameter.

equalTo: ['password', 'Passwords must match']

Validates that a numeric value doesn't exceed the specified maximum. Takes a number as the first parameter in the validation rule.

max: [100, 'Value cannot exceed 100']

Validates that a string doesn't exceed the specified maximum length. Takes a number as the first parameter in the validation rule.

maxLength: [100, 'Cannot exceed 100 characters']

Validates that a numeric value is at least the specified minimum. Takes a number as the first parameter in the validation rule.

min: [18, 'Value must be at least 18']

Validates that a string has at least the specified minimum length. Takes a number as the first parameter in the validation rule.

minLength: [6, 'Must be at least 6 characters long']

Validates that the input contains a valid numeric value. Ensures the field can be converted to a number without errors.

number: [true, 'Please enter a number']

Validates that a numeric value falls within the specified range. Takes an array of two numbers [min, max] as the first parameter.

range: [[1, 10], 'Value must be between 1 and 10']

Validates that a string's length falls within the specified range. Takes an array of two numbers [min, max] as the first parameter.

rangeLength: [[8, 16], 'Must be between 8 and 16 characters']

Validates that the input matches the specified regular expression pattern. Takes a RegExp object or a string pattern as the first parameter.

regex: [/^[A-Z][a-z]+$/, 'Must start with capital letter followed by lowercase letters']

Validates that the field has a non-empty value. When configured with [true], the field cannot be empty, null, or undefined.

required: [true, 'This field must be filled in']

Validates that the input conforms to a standard telephone number format. Checks for proper formatting of phone numbers with optional country code.

tel: [true, 'Please enter a valid phone number']

Validates that the input is a properly formatted URL. Checks for proper protocol, domain structure, and path format.

url: [true, 'Please enter a valid website URL']