field_validator_flutter 0.0.1

A centralized, reusable, and easy-to-use field validation utility class for Flutter apps.

FieldValidatorFlutter

A centralized, reusable, and easy-to-use field validation utility class for Flutter apps.

FieldValidatorFlutter provides a collection of static validation functions to validate common form fields like email, phone number, password, username, name, URL, tax percentage, quantity, OTP, postal code, and more.

---

✨ Features

✅ Centralized validation logic
✅ Covers most common form fields
✅ Ready-to-use static functions
✅ Customizable parameters (length limits, field names, etc.)
✅ Works with Flutter TextFormField validators

---

📦 Installation

Add the latest version to your pubspec.yaml:

dependencies:
  field_validator_flutter: ^1.0.0

Use in a Form

TextFormField(
  decoration: InputDecoration(labelText: 'Email'),
  validator: (value) => FieldValidatorFlutter.email(value),
),

Supported Validators & Custom Parameters

Validator Function	Purpose	Customizable Parameters
firstName()	Validate first name	lengthLimit (min length)
lastName()	Validate last name	lengthLimit (min length)
username()	Validate username (alphanumeric, underscores, dots)	—
email()	Validate email format	—
phone()	Validate phone number (7-15 digits, optional +)	—
mobile()	Validate mobile number (custom length)	length (exact length)
password()	Validate strong password (uppercase, lowercase, number, special char, min 8 chars)	—
confirmPassword()	Validate password confirmation	Pass password string for match check
url()	Validate website URL	—
tax()	Validate tax percentage (0 - 100)	—
quantity()	Validate quantity (positive integer)	—
postalCode()	Validate postal code (4-10 digits)	—
otp()	Validate OTP (custom length, numeric)	length (default 6 digits)
message()	Validate message (required, min length)	lengthLimit
address()	Validate address (required, min length)	lengthLimit
required()	Validate required field	fieldName
numeric()	Validate numeric input	fieldName
positiveNumber()	Validate positive number	fieldName
length()	Validate string length (min/max)	min, max, fieldName

🧩 Customization

Many validator functions allow optional parameters like lengthLimit, fieldName, length to customize error messages and validation rules.

FieldValidatorFlutter.mobile(value, length: 8); // mobile number with 8 digits

Authors

• @alpeshshiyal

License

MIT

Use freely in your commercial or personal Flutter projects.

🤝 Contributions

Feel free to fork, improve, or add more validators! Pull requests are welcome.