Validates if a date has a correct format (ISO8601).

Validates if a file type is accepted.

Generates a random integer with a specified number of digits.

PASSWORD HASHING.

Check if keys exist in map.

UUID PARSER.

Validates if a reaction value is the correct one.

New creates a new instance of CustomValidator.

Error codes.

CustomValidator is a custom validator that uses "github.com/go-playground/validator/v10".