Have you considered using the RSS feed to import posts?
Another possible solution might be to use the export feature, the output is an xml file though not js. I found a program that will import the WordPress Exported file (which allows you to choose certain posts, all post, or posts between a certain date, or by category).
After you import the WordPress XML file you can generate; an HTML file, T.O.C, or a Word HTML file that consists of the exported file content. I’m not sure what your destination site uses to display content, but it should have a way to import the data.