Passing JSON from NodeJS to R using r-script - r

Question

I am trying to setup a simple connect between a NodeJS application and an R-script.
So far I've managed to set up the basic connection and the running of the cript, by using r-script (found on npm).
However, I am not able to pass a simple json to the R so that it can be converted to a dataframe using jsonlite.
NodeJS Code:
var R = require("r-script");
var out = R("script.R")
.data({"Name" : "Mario", "Age" : 32, "Occupation" : "Plumber"}, {"Name" : "Peach", "Age" : 21, "Occupation" : "Princess"}, {}, {"Name" : "Bowser", "Occupation" : "Koopa"})
.callSync();
console.log(out);
script.R:
library("jsonlite")
mydf <- fromJSON(input[[1]])
This gives the output:
'Argument 'txt' must be a JSON string, URL or file.'
I have tried removing the indexation of the vector (and give the full list to the fromJSON) but it also doesn't work.
Has anyone sucessfully passed JSON to an R script with this npm module?
Thanks in advance!
EDIT:
Also, if place the JSON between "'", it gives me "trailing errors" in spaces, and if they are removed, on the { char.

Answer 1

I have no idea about how R works, however the error could point to the fact that what you are trying to pass is a javascript object, not a JSON. Javascript objects look like but are not identical to JSONs (see discussion here Javascript object Vs JSON)
One thing that you can try is passing in the data function a JSON string by calling the JSON.stringify function on your objects. Something like this:
var R = require("r-script");
var out = R("script.R")
.data(JSON.stringify({"Name" : "Mario", "Age" : 32, "Occupation" : "Plumber"}), JSON.stringify( {"Name" : "Peach", "Age" : 21, "Occupation" : "Princess"}),JSON.stringify ({}), JSON.stringify({"Name" : "Bowser", "Occupation" : "Koopa"}))
.callSync();
console.log(out);
It's a longshot but it shows a general direction on which you can debug

Answer 2

I managed to found a simple solution, the Manos Agelidis answer did put me in the right direction.
Basically, I have able to parse the input string using:
string = paste(input, collapse=",")
string = paste("[",string,"]")
frame = fromJSON(string)
and in NodeJS:
var out = R("script.R")
.data('{"Name":"Mario","Age":32,"Occupation":"Plumber"}',
'{"Name":"Peach","Age":21,"Occupation":"Princess"}',
'{}',
'{"Name":"Bowser","Occupation":"Koopa"}')
.callSync();
fromJSON requires a vector but in string form, and not a literal vector. Therefore, what I needed to do what to create a string using the elements of the input and to add [ and ] to the begging and end of the string, respectively. This did convert to a data frame properly.