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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