Get usable JSON from NWC Task form / Repeater

Not sure if this is helpful or relevant to what you're trying to do, but I seem to be having luck getting collections into a JSON format with the following 4 actions:

1. Create Text String 
   1. Input: Collection Variable Output: Text Variable
2. Modify String
   1. Input: Text Variable Replace Substring: "" With string: " Output: Text Variable
3. Modify String
   1. Input: Text Variable Replace Substring: "{ With string: { Output: Text Variable
4. Modify String
   1. Input: Text Variable Replace Substring: }" With string: } Output: Text Variable

Once I run those 4 actions against my collection (Which I expect to be JSON already), it is a valid JSON string. 

Disclaimer: My collections are coming from built in actions and Xtension actions, not repeatable form sections. However, the formatting of the string in your screenshot is the same what I'm getting, so maybe it would work for you as well. 

@SanthoshKumar-R I believe that this is related to how form variables as passed to the workflow engine for interpretation. We have a similar feature request open to better handle Start Variables (form variables included), which should also fix this problem if you'd like to add your vote to it: https://nintex.uservoice.com/forums/430063-5-nintex-workflow-cloud/suggestions/39801832-improved-instance-start-data-naming.

Not sure that there is currently another way around this.

Is there a way to easily generate a JSON output from the form submitted? I am new in that specific space and would love an action or something that could easily summarise the form and captured information and generate a usable JSON. I need something that does that and appends the JSON file to something like an email action. I also want to try and avoid having to use SPO etc to store the file and then retrieve the file. SmartIQ and other such forms and workflow engines can do that natively, however Nintex does not appear to have something that I would consider a core easy win.

Thanks.