The validator package comes with several common validations and removes the boiler plate code from your project.

Features

Contains several common validations
Supports grouping of validators to write concise code
Zero dependency
Well tested
Easy to use and removes boiler plate code from your project

How to use

Install

flutter pub add pro_validator

Example

NOTE: if validate value contains is a null value, the result is null, not an error.

import 'package:pro_validator/pro_validator.dart';

void main() {
  const emailValidator = MultiValidator(
    validators: [
      RequiredValidator(error: 'Required field'),
      EmailValidator(error: 'Invalid email'),
    ],
  );

  print('null email validation ${emailValidator(null)}');
  print('empty email validation ${emailValidator('')}');
  print('invalid email validation ${emailValidator('mail@com')}');
  print('valid email validation ${emailValidator('mail@mail.com')}');

  const passwordValidator = MultiValidator(
    validators: [
      RequiredValidator(error: 'Required field'),
      MinLengthValidator(min: 8, error: 'Min length 8'),
      HasUppercaseValidator(error: 'Must contain at least one uppercase'),
      HasLowercaseValidator(error: 'Must contain at least one lowercase'),
    ],
  );

  print('null password validation ${passwordValidator(null)}');
  print('empty password validation ${passwordValidator('')}');
  print('min length password validation ${passwordValidator('1232')}');
  print('invalid password validation ${passwordValidator('12345678')}');
  print('invalid password validation ${passwordValidator('12345678A')}');
  print('valid password validation ${passwordValidator('a12345678A')}');

  final matchValidator = MatchValidator(error: 'Do not match');

  print('match validation ${matchValidator('a', 'b')}');
}

Available Validators

Validator	Description
RequiredValidator	Ensures the value is not empty, not white space only.
MaxLengthValidator	Ensures the value length contains no more than a set [max] of characters.
MinLengthValidator	Ensures the value length contains no fewer than a set [min] of characters.
HasUppercaseValidator	Ensures the value contains a minimum of one uppercase character.
HasLowercaseValidator	Ensures the value contains a minimum of one lowercase character.
HasANumberValidator	Ensures the value contains a minimum of one numeric character.
LengthRangeValidator	Ensures the value length is contained in the range [min, max].
NumRangeValidator	Ensures the num value is contained in the range [min, max].
EmailValidator	Ensures the value is a validly formatted email address.
PhoneValidator	Ensures the value is a validly formatted phone number.
UrlValidator	Ensures the value is a validly formatted URL.
PatternValidator	Ensures a custom regular expression string.
MatchValidator	A special match validator to check if the v1 equals v2 value.
MultiValidator	Group together and validate the basic validators.