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Validator Kit

A lightweight, reusable, customizable and null-safe Flutter form validation package that helps you validate forms with clean and readable code.

Perfect for Flutter forms, form validation, email validation, password validation, phone validation, URL validation, and custom input validation. Validator Kit makes it easy to build production-ready Flutter applications with a simple and consistent validation API.

pub package License: MIT Flutter

✨ Features

  • ✅ Required Validator
  • ✅ Email Validator
  • ✅ Phone Validator
  • ✅ URL Validator
  • ✅ Username Validator
  • ✅ Password Validator
  • ✅ Confirm Password Validator
  • ✅ Number Validator
  • ✅ Pattern Validator
  • ✅ Date Validator
  • ✅ Credit Card Validator
  • ✅ Minimum Value Validator
  • ✅ Maximum Value Validator
  • ✅ Range Validator
  • ✅ Minimum Length Validator
  • ✅ Maximum Length Validator
  • ✅ Fixed Length Validator
  • ✅ Contains Validator
  • ✅ Starts With Validator
  • ✅ Ends With Validator
  • ✅ Equal Validator
  • ✅ Not Equal Validator
  • ✅ Combine Multiple Validators
  • ✅ Validate Without TextFormField
  • ✅ Custom Error Messages
  • ✅ Null-safe
  • ✅ Lightweight & Fast

📱 Preview

🎬 Demo

📦 Installation

Add the package to your pubspec.yaml

dependencies:
  validator_kit: latest_version

or install directly from pub.dev.

Then run

flutter pub get

🚀 Import

import 'package:validator_kit/validator_kit.dart';

⚡ Quick Start

TextFormField(
  validator: ValidatorKit.combine([
    ValidatorKit.required(),
    ValidatorKit.email(),
  ]),
)

📚 Available Validators

Required

ValidatorKit.required()

Email

ValidatorKit.email()

Phone

ValidatorKit.phone()

Username

ValidatorKit.username()

Password

ValidatorKit.password()

Confirm Password

ValidatorKit.confirmPassword(
  () => passwordController.text,
)

URL

ValidatorKit.url()

Number

ValidatorKit.number()

Minimum Number

ValidatorKit.min(18)

Maximum Number

ValidatorKit.max(100)

Range Number

ValidatorKit.range(
  min: 18,
  max: 60,
)

Length

ValidatorKit.length(
  min: 5,
  max: 20,
)

Example:

validator: ValidatorKit.combine([
  ValidatorKit.required(),
  ValidatorKit.length(
    min: 5,
    max: 20,
  ),
])

Minimum Length

ValidatorKit.minLength(8)

Maximum Length

ValidatorKit.maxLength(30)

Contains

ValidatorKit.contains('Flutter')

Example:

validator: ValidatorKit.combine([
  ValidatorKit.required(),
  ValidatorKit.contains('Flutter'),
])

Starts With

ValidatorKit.startsWith('Mr.')

Example:

validator: ValidatorKit.combine([
  ValidatorKit.required(),
  ValidatorKit.startsWith('Mr.'),
])

Ends With

ValidatorKit.endsWith('.com')

Example:

validator: ValidatorKit.combine([
  ValidatorKit.required(),
  ValidatorKit.endsWith('.com'),
])

Equal

ValidatorKit.equal('Flutter')

Example:

validator: ValidatorKit.combine([
  ValidatorKit.required(),
  ValidatorKit.equal('Flutter'),
])

Not Equal

ValidatorKit.notEqual('admin')

Example:

validator: ValidatorKit.combine([
  ValidatorKit.required(),
  ValidatorKit.notEqual('admin'),
])

Pattern

ValidatorKit.pattern(
  RegExp(r'^[A-Z]{2,5}-\d{4}-\d{4}$'),
  message: 'Enter a valid Employee ID',
)

Credit Card

ValidatorKit.creditCard()

Example:

validator: ValidatorKit.combine([
  ValidatorKit.required(),
  ValidatorKit.creditCard(),
])

Date

ValidatorKit.date()

Example:

validator: ValidatorKit.combine([
  ValidatorKit.required(),
  ValidatorKit.date(),
])

Combine Validators

validator: ValidatorKit.combine([
  ValidatorKit.required(),
  ValidatorKit.email(),
  ValidatorKit.minLength(8),
])

Disable Validation

If you want to disable validation conditionally:

ValidatorKit.none()

Example

validator: isGuest
    ? ValidatorKit.none()
    : ValidatorKit.required(),

Custom Error Message

ValidatorKit.email(
  message: 'Please enter a valid email.',
)

💻 Complete Example

TextFormField(
  decoration: const InputDecoration(
    labelText: 'Email',
  ),
  validator: ValidatorKit.combine([
    ValidatorKit.required(),
    ValidatorKit.email(),
    ValidatorKit.minLength(8),
  ]),
)

❤️ Why Validator Kit?

Validator Kit is a modern Flutter validator package designed to simplify form validation in Flutter applications.

Whether you need an email validator, password validator, phone validator, URL validator, username validator, or custom input validation, Validator Kit provides a clean, reusable and developer-friendly API.

Why developers choose Validator Kit

  • 🚀 Lightweight and fast
  • 🧩 Easy to integrate into any Flutter project
  • 📝 Clean and readable API
  • 🔄 Combine multiple validators easily
  • 🎯 Supports custom error messages
  • ✅ Fully null-safe
  • ♻️ Reusable across multiple projects
  • 📱 Perfect for Flutter Forms
  • 💙 Production ready

🛣️ Roadmap

  • 🌍 Localization
  • 🌐 IPv4 Validator
  • 🌐 IPv6 Validator
  • 🆔 IBAN Validator
  • 🪪 UUID Validator
  • 📍 Latitude & Longitude Validator
  • 📦 File Validator
  • 📅 Time Validator
  • 🔥 Async Validators
  • ⚙️ Validator Builder
  • 🌎 Multi-language Error Messages

🤝 Contributing

Contributions are welcome!

If you'd like to improve Validator Kit, feel free to open an issue or submit a pull request.

⭐ Support

If you like this package, please give it a ⭐ on GitHub.

It helps the project grow and motivates future improvements.

🤝 Connect with Me

If this package helps you, feel free to connect.

📄 License

This project is licensed under the MIT License.

🔍 Keywords

Flutter Validator • Form Validation • Validator Package • Flutter Forms • Email Validator • Password Validator • Phone Validator • URL Validator • Username Validator • Input Validation • Null Safe • Flutter Package • Dart Validator • Form Validator • Flutter Validation Library

Libraries

validator_kit
Validator Kit