Leaflet.ZoomLabel is a simple zoom level control that you can drop into your leaflet map. It displays zoom level of the map.
Include the CSS:
<link rel="stylesheet" href="L.Control.ZoomLabel.css">
Include the JavaScript:
<script src="L.Control.ZoomLabel.js"></script>
Example usage:
L.control.zoomLabel().addTo(map);
position:
The standard Leaflet.Control position parameter. Defaults to 'bottomleft'
http://unbam.github.io/Leaflet.ZoomLabel/
MIT