Grafana Dashboards can easily be exported from the its UI 

Exporting a dashboard

Dashboards are exported in Grafana JSON format, and contain everything you need (layout, variables, styles, data sources, queries, etc.) to import the dashboard at a later time.

The export feature is accessed in the share window which you open by clicking the share button in the dashboard menu.

Making a dashboard portable

If you want to export a dashboard for others to use then it could be a good idea to add template variables for things like a metric prefix (use constant variable) and server name.