Hi Kumar,

 You can refer below documentation.

https://success.outsystems.com/documentation/10/extensibility_and_integration/javascript/extend_your_mobile_app_using_javascript/

Hello Kumar!
I had a similar issue when trying to transition from a hardcoded JSON into an input parameter inside of a JavaScript node.

It didn't work because the hardcoded JSON looked like this:

And the input parameter was a local variable of type Text that looked like this:

So this is what I had to do:
1) Create a structure with the fields that the JSON has

2) Create a variable, that is a list of the structure

3) Use JSONDeserialize

4) Use ListAppendAll

5) Use JSONSerialize

6) Pass the JSONSerialize.Json as an input parameter to the JavaScript node

7) Inside the JavaScript node, use JSON.parse() to generate a JSON object from a JSON string