create a single page to make magento api

Method 1# Return Categories tree information

1. http://localhost/magento/web-api.php?route=random&limit=4&key=your_web_api_key /get-api.php?route=categories&parent=0&level=2&key=key1

2. Return Categories tree information

   Method 2# Return Products list in category

3. http://localhost/magento/web-api.php?route=products&category=5&key=key1 /get-api.php?route=products&category=5&key=key1

4. Return Products list in category

   Method 3# Return Random Products list

5. http://localhost/magento/web-api.php?route=random&limit=5&key=key1 /get-api.php?route=random&limit=5&key=key1

6. Return Random Products list

Method 4# Return product item

1. http://localhost/magento/web-api.php?route=product&id=17&key=key1 /get-api.php?route=product&id=17&key=key1 2 Return product

from this help me to make magento rest api after make rest role and user in the magento put this in the root of the magento and this will help you make the api working in the magento.