FormChecker

A TypeScript library for flexible and customizable form validation with support for synchronous and asynchronous rules.

Features

• Define validation rules for each form field.
• Supports built-in validation rules such as required, checked, min, max, minLength, maxLength, equal, and regexp.
• Supports custom asynchronous validation rules (test).
• Handles data transformation before and after validation (onBefore, onAfter).
• Returns detailed validation results including errors and custom or default messages.
• Contains standard validation error messages in several languages ​​such as: English, Portuguese, Spanish, Chinese, etc.

Installation

With NPM:

npm install form-checker-ts

Or with Yarn:

yarn add form-checker-ts

Example Usage

import { formChecker, type FormCheckerSchema } from 'form-checker-ts';

type Data = {
    name: string;
    email: string;
    password: string;
    password_confirm: string;
};

const schema : FormCheckerSchema<Data> = {
    name: { required: true, minLength: 3, maxLength: 30 },
    email: { required: true, minLength: 5, maxLength: 50 },
    password: { required: true, minLength: 6, maxLength: 20, regexp: [/[a-z]/, /[A-Z]/, /[0-9]/] },
    password_confirm: { required: { ifFilled: 'password' }, equal: 'password' }
};

const data : Data = {
    name: 'Guilherme',
    email: '[email protected]',
    password: 'Q1w2E3r4',
    password_confirm: 'Q1w2E3r4'
};

formChecker(schema, data, 'pt').then(result => {
    console.log(result);
});

Author

• Guilherme Neves - github - website

License

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