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README.md

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+# ICO Lookup API (Node.js)
+
+This is a minimal Node.js + Express server that acts as an API wrapper around Finančná správa SR's open data interface.  
+It allows you to look up Slovak companies by their IČO number (company identifier).
+
+## Features
+
+- Accepts GET requests with an IČO as query parameter
+- Returns company information in JSON format
+- Built with Express and Axios
+- Hardcoded API key for simplicity
+
+## Setup Instructions
+
+1. Download and extract the project
+2. Open `server.js` and replace:
+
+```
+const API_KEY = "your_api_key_here";
+```
+
+with your actual API key from [https://iz.opendata.financnasprava.sk](https://iz.opendata.financnasprava.sk)
+
+3. In the project directory, run:
+
+```bash
+npm install express axios
+```
+
+4. Start the server:
+
+```bash
+node server.js
+```
+
+5. Use the API:
+
+Open your browser or use curl/Postman:
+
+```
+http://localhost:3000/api/lookup?ico=36215589
+```
+
+### Example response
+
+```json
+{
+  "meta": {...},
+  "data": [...]
+}
+```
+
+## Requirements
+
+- Node.js 14 or newer
+- Internet connection
+- Valid API key from Finančná správa SR

server.js

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+// Simple Node.js + Express API server to look up Slovak companies by IČO
+// using the Finančná správa SR open data API
+
+const express = require("express");
+const axios = require("axios");
+
+const app = express();
+const PORT = 3000;
+
+// Insert your API key from Finančná správa SR below
+const API_KEY = "2t5lK487ces7Rc4oEHrIwCjB5DpoZUBChQxCLBiSrwGNdEubKpraAtQLEiJmPXkdjNw5FssYpuO0LXSZpk3U6oqePyFaIGHokg4WNPEM0302X2BK4iXpkFv9Qg7jyeUXh50bWVExVrVSBuOnOQpBzzdJ1k1D54b115MD3y5ticWxvGDLUaqLQgA6nzFgbYOx6dR0ToJUxU714TetLBZCBy0xKSnBaOrxYv10I1gZ1q4rQx4Q8k7BTR6MaP";
+
+// Endpoint: GET /api/lookup?ico=XXXXXXXX
+// Example: http://localhost:3000/api/lookup?ico=36215589
+app.get("/api/lookup", async (req, res) => {
+  const ico = req.query.ico;
+
+  // Validate ICO presence
+  if (!ico) {
+    return res.status(400).json({ error: "Missing ICO parameter" });
+  }
+
+  const url = `https://iz.opendata.financnasprava.sk/api/data/ds_dsrdp/search?page=1&column=ico&search=${ico}`;
+
+  try {
+    // Make a request to Finančná správa API
+    const response = await axios.get(url, {
+      headers: {
+        accept: "application/json",
+        key: API_KEY
+      }
+    });
+
+    // Return the fetched JSON data
+    res.json(response.data);
+  } catch (error) {
+    // Handle errors (e.g. invalid API key, server down)
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// Start the server
+app.listen(PORT, () => {
+  console.log(`API server is running at http://localhost:${PORT}`);
+});