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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

server.js

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+const express = require('express');
+const cors = require('cors');
+const bodyParser = require('body-parser');
+const soap = require('soap');
+
+const app = express();
+const PORT = 3000;
+
+app.use(cors());
+app.use(bodyParser.json());
+
+const VIES_WSDL = 'https://ec.europa.eu/taxation_customs/vies/checkVatService.wsdl';
+
+// GET endpoint for validating VAT via URL
+app.get('/api/validate-vat', async (req, res) => {
+  const countryCode = req.query.countryCode;
+  const vatNumber = req.query.vatNumber;
+
+  if (!countryCode || !vatNumber) {
+    return res.status(400).json({ error: 'Missing countryCode or vatNumber in query parameters.' });
+  }
+
+  try {
+    const client = await soap.createClientAsync(VIES_WSDL);
+    const [result] = await client.checkVatAsync({ countryCode, vatNumber });
+
+    res.json({
+      country: countryCode.toUpperCase(),
+      VAT: vatNumber,
+      name: result.name || null,
+      address: result.address || null,
+      valid: result.valid
+    });
+  } catch (error) {
+    console.error('SOAP error:', error);
+    res.status(500).json({ error: 'Failed to validate VAT number.' });
+  }
+});
+
+// POST endpoint (original)
+app.post('/api/validate-vat', async (req, res) => {
+  const { countryCode, vatNumber } = req.body;
+
+  if (!countryCode || !vatNumber) {
+    return res.status(400).json({ error: 'Missing required fields.' });
+  }
+
+  try {
+    const client = await soap.createClientAsync(VIES_WSDL);
+    const [result] = await client.checkVatAsync({ countryCode, vatNumber });
+
+    res.json({
+      country: countryCode.toUpperCase(),
+      VAT: vatNumber,
+      name: result.name || null,
+      address: result.address || null,
+      valid: result.valid
+    });
+  } catch (error) {
+    console.error('SOAP error:', error);
+    res.status(500).json({ error: 'Failed to validate VAT number.' });
+  }
+});
+
+// Start server
+app.listen(PORT, () => {
+  console.log(`✅ Server is running at http://localhost:${PORT}`);
+});