NiFi InvokeHTTP POST JSON

[#1]

I'm totally new to NiFi and learning as I go, but am against a hard deadline and need urgent assistance. I was tasked to create a data interface between two learning systems to send course completion data.

I'm creating a flow to send course completion data from one system to another and have a JSON formatted file (to send as HTTP body to send as a CURL post?)

This is the sample JSON data that I've created so far:
{"user_id":10042,"username":"de","course_id":"C00230","completed_on":"12-02-2020","SCORE":100}

The suggested HTTPS Curl request format is provided below.
curl -v -X POST -d "j_username=admin&j_password=admin&userID=MORRW001&crsID=C00565&dateCompleted=2020-11-16&testScore=100&courseType=a" https://lms.dev.test.net/jw/web/json/data/

How do I configure the InvokeHTTP processor to send it correctly? Do I need to reformat the JSON data so it's in the correct format for the curl format shown above?

Remember I'm just a NiFi novice, so details, including screenshots would be appreciated.

Thanks in advance!

[#2]

@justenji   Great response!

@GMAN  I have some templates that may help you get a head start:

https://github.com/steven-matison/NiFi-Templates

There are 2 InvokeHttp Examples.

[#3]

@stevenmatisonI used your template and tried to assign attributes using EvaluateJSONPath as show here:

This is the JSON data entering the EvaluateJSONPath processor.

{"user_id":"68","course_id":"HA044","completed_on":"12-15-2020","score":null}

However only the "crsID" and "dateCompleted" attributes are showing as attributes in the queue after this processor and I don't understand why.  

[#4]

Thats weird.. did you scroll the attributes list down (just in case its that simple)?   i cant see the full modal so not sure.

The config of each attribute looks okay so does the json.

[#5]

@stevenmatisonYou were correct as the other attributes were listed at the bottom of the Attribute Values.   I didjn't notice the scroll bar and needed to scroll down.  

Thanks again.