Rosette's endpoints can be accessed in any language or platform that supports http calls. Once you've gotten an API key here, add that as the X-RosetteAPI-Key header value, and make an http call to https://api.rosette.com/rest/v1/[endpoint] with the content body as exemplified in our interactive documentation. Rosette returns a JSON response.
We've also written client bindings in popular coding languages, and sets of example scripts for bash and Ruby, in order to help users access Rosette's capabilities in their favorite language. You can find them at github.com/rosette-api, or in the language's respective package manager. See Client Bindings for more information.