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README.md

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+# VAT Number Validation API
+
+This Node.js application provides an API interface to validate European VAT numbers using the official VIES SOAP service.
+
+## Features
+
+- Validate VAT numbers for any EU member state
+- GET and POST HTTP support
+- JSON responses with company name, address, and validity
+
+## Installation
+
+```bash
+npm install express cors body-parser soap
+```
+
+## Usage
+
+### Start the server
+
+```bash
+node server.js
+```
+
+### Endpoints
+
+#### GET `/api/validate-vat`
+
+**Query parameters:**
+
+- `countryCode`: ISO 2-letter country code (e.g., SK, DE, FR)
+- `vatNumber`: VAT number without country code
+
+**Example:**
+
+```
+http://localhost:3000/api/validate-vat?countryCode=SK&vatNumber=1234567890
+```
+
+#### POST `/api/validate-vat`
+
+**Request body (JSON):**
+
+```json
+{
+  "countryCode": "SK",
+  "vatNumber": "1234567890"
+}
+```
+
+**Response:**
+
+```json
+{
+  "country": "SK",
+  "VAT": "1234567890",
+  "name": "Example Company",
+  "address": "Main Street 123, City, Country",
+  "valid": true
+}
+```
+
+## License
+
+MIT