Below is a blog post for a flow i made using the nifi api, which will accept a template (XML), load the template, get template, then follow chain of api calls to get the appropriate flow definiton file (JSON). https://cldr-steven-matison.github.io/blog/dataflow-xml-to-json/ The concepts you need to understand are demonstrated with invokeHttp to execute the sample calls. Check the nifi api docs. You can do these calls with curl, etc., but i chose to do them in nifi. Be mindful that to start using the api from outside of nifi, you need to be following the initial api call for an access token to be used with the rest of the calls.
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