Thanks Nat,

My data JSON which I want to fill in with values coming from front end and 
template json which I want to fill in, both are highly complex. template 
json It has many nested fields. Right now, I have one static JSON which I 
know, but in future it might change.  But I know that It makes sense in 
Java env. 

For example, in my template.json,  with field class, values are again 
nested into single value or multiple value. 
{  id: "",
   name: "",

   .....,
   fields: [
      field :{ 
     id: 110, type: String, enabled: true, value : { id: 101, name: 
"Doctor" , hidden : false}

        },    
 field :{
    id: 110, type: String, enabled: true, multivalue : {  value:  [{ id: 
101, name: "Doctor" , hidden : false},  { id: 101, name: "Doctor" , hidden 
: false}]}}


},
    field :{},    field :{},......    field :{},

     ]


}


Can you suggest how will I achieve fields array in my template class 
(following your approach). I create another field class but then we have 
values which can be of differnt types.

On Saturday, December 23, 2017 at 5:29:03 AM UTC-5, Lucky Jindal wrote:
>
> Hi, 
> I am fairly new to node stack and still learning.  I am new to this forum 
> and I hope someone could help me fixing my problem here.
>
> Right now, I am working on backend (express.js) where I need to deal to 
> lot of JSON for writing restful apis. 
>
> Application - Front end sends form data in JSON format ( data model. json) 
> and it is sent to backend. Backend router accepts POST request with form 
> data and does something with it, transforms it into some another JSON 
> format, say, object.json and sends it over to external server via POST and 
> gets 200 OK. Now, I am dealing with huge and nested JSONs and many calls 
> over http to 3rd party server.  
>
> My problem here: Since both JSONs, data model JSON and object. json are in 
> completely different format, transforming is hard part. Since they are 
> written by different teams, it kind of hard to have matching fields/keys.
>
> Example . 
> *1. "data.json"  *-> Coming from Angular front end, it has form data and 
> sent when form submitted like-
> *{ name : "ASC", id : "101".....}*
>
> 2. In backend, I have router methods, which gets this POST call and 
>
> ~ accept data.json (with data)
> ~ read  another json, *"object.json"* which is more like a template. This 
> is in the format accepted by restful api on external server. So we have to 
> use this, fill in it with data from data.json and send it over.
> ~ *"object.json "*
>  {username : "", userId : "".... }
>
> So Idea is, I read data from data.json and fill in template.json and send 
> it over. 
>
> I tried 2 methods  ---
> 1. Traverse over keys in *object.json* one by one and fill in manually, 
> which seems lot of work and these are huge jsons. This was working until I 
> realized, its getting cumbersome.
> 2. Using some external templating API.  One I tried was *json-templater.*
>
>
> Now,  my template.json
> ~ {username : "{{uname}}", userId : "{{uid}}" } . Values in {{}} will be 
> filled up by this new api.
> ~
> var object = require (../json-templater) 
> return object( require(object.json, {uname :"ABC"}}
>
> It worked partially.  
>  
> Results returned by 'return' are same as I want. But something is changed, 
> format. Because results are rejected by external server.  If I comment this 
> call, and hardcode same results, it works ok.
> Since I am just learning and trying to make it work and trying to find out 
> what happened, I hard coded all the data in "object.json" and still run 
> object function in json-template and it breaks.
> Only way it works is, not passing it through object function in 
> json-templater. 
>
>
> Any ideas to make this work or new API or any other approach. Suggestions 
> welcome.
>
> Thanks
>
>
>
>
>
>
>
>>
>>

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