TypeScript Data Validator

A lightweight, type-safe validation library for TypeScript/JavaScript applications.

Features

• 🚀 Type-safe validation schemas
• 💪 Built-in validators for common types
• 🔄 Nested object validation
• 📝 Custom validation rules
• 0️⃣ Zero dependencies

Installation

npm install @sunillakandri/data-validator

Quick Start

import { DataValidator } from "@sunillakandri/data-validator";

// Define schema
const schema = {
  username: {
    type: "string",
    required: true,
    minLength: 3,
  },
  email: {
    type: "string",
    pattern: /^[^\s@]+@[^\s@]+\.[^\s@]+$/,
  },
};

// Create validator
const validator = new DataValidator(schema);

// Validate data
const result = validator.validate({
  username: "john_doe",
  email: "john@example.com",
});

Validation Rules

• required: Field must be present
• type: Type validation ('string', 'number', 'boolean', 'object', 'array')
• minLength/maxLength: String length limits
• min/max: Number value limits
• pattern: RegExp pattern matching
• custom: Custom validation function
• nested: Nested object schema

Example: Custom Validation

const schema = {
  password: {
    type: "string",
    custom: (value) => {
      if (!/[A-Z]/.test(value)) {
        return "Need one uppercase letter";
      }
      if (!/[0-9]/.test(value)) {
        return "Need one number";
      }
    },
  },
};

License

MIT © Sunil Lakandri

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Made by Sunil Lakandri