Leaflet working with Openstreetmap as a map provider

[ Source: Leaflet tutorial ]

openstreetmap tiles

Choose your leaflet provider in http://leaflet-extras.github.io/leaflet-providers/preview/

L.tileLayer( 'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', { attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a>', subdomains: ['a','b','c'] }).addTo( map );