Form Validation Library

Overview

The Form Validation Library is a lightweight and flexible JavaScript library for validating form fields in web applications. It offers a simple API for defining validation rules and validating form data.

Features

• Customizable Validation Rules: Define custom validation rules for different types of form fields.
• Easy Integration: Easily integrate the library into your web applications with just a few lines of code.
• Error Handling: Automatically handle form validation errors and display error messages to users.

Installation

You can install the Form Validation Library via npm:

npm install form-validation-library

Usage

const FormValidator = require('form-validation-library');

const validator = new FormValidator();

// Example validation rules
const validationRules = {
  username: ['required'],
  email: ['required', 'email'],
  password: ['required', 'password'],
};

// Example form data
const formData = {
  username: 'example',
  email: '[email protected]',
  password: 'password123',
};

const errors = validator.validateForm(formData, validationRules);
console.log(errors);

API

FormValidator

constructor()

Creates a new instance of the FormValidator class.

validateField(field, value, rules)

Validates an individual form field.

• field: The name of the form field.
• value: The value of the form field.
• rules: An array of validation rules to apply to the form field.

Returns an error message if the field is invalid, or null if the field is valid.

validateForm(formData, validationRules)

Validates an entire form.

• formData: An object containing the form data, where keys are field names and values are field values.
• validationRules: An object containing validation rules for each form field.

Returns an object containing error messages for invalid fields.

License

This project is licensed under the MIT License - see the LICENSE file for details.