How to migrate nodes from a dev site to a production site?
Sounds like Node Export to export your nodes from dev and then re-import them on your live site.

Node Export provides several ways to export nodes:


Through a tab that appears on the node page.
Using update options on the Content page.
In a command line using Drush.
Using the Features module.
Using the Views Bulk Operations module.


and the Node export package comes with the following formats:


JSON
Drupal var export
Node code
CSV
Serialize
XML