edge.js: C# call javascript with JSON input

I'm attempting to transform the result of an arbitrary REST call to via an arbitrary function within a C# project. I think that Edge.js should be able to do what I need; however, I am having trouble getting it to understand a JSON object/array.

From the documentation: Edge.js can marshal any JSON-serializable value between .NET and Node.js (although JSON serialization is not used in the process).

However, what do you do if you have a JSON string, or a Newtonsoft JToken to start with?

My test code below (C#):

List<Dictionary<string, object>> dlist = new List<Dictionary<string, object>>()
{
    new Dictionary<string, object>
    {
        {"a", "abc" },
        {"b", "def" }
    },
    new Dictionary<string, object>
    {
        {"a", "ghi" },
        {"b", "jkl" }
    },
    new Dictionary<string, object>
    {
        {"a", "mno" },
        {"b", "pqr" }
    },
    new Dictionary<string, object>
    {
        {"a", "stu" },
        {"b", "vwx" }
    }
};

var createHttpServer = Edge.Func(@"
    var http = require('http');

    return function (port, cb) {
        var server = http.createServer(function (req, res) {
            res.writeHead(200, {'Content-Type': 'application/json'});
            res.end(JSON.stringify([
                {a:'abc',b:'def'},
                {a:'ghi',b:'jkl'},
                {a:'mno',b:'qrs'},
                {a:'tuv',b:'wxy'}
            ]));
        }).listen(port, function (error) {
            cb(error, function (data, cb) {
                server.close();
                cb();
            });
        });
    };
");

Func<object, Task<object>> closeHttpServer = (Func<object, Task<object>>)await createHttpServer(8080);
string stringResponse = await new WebClient().DownloadStringTaskAsync("http://localhost:8080");
JToken jsonResponse = JToken.Parse(stringResponse);

Func<object, Task<object>> mapArrayToA = Edge.Func(@"var _prog = function(x) { return x.map(a => a.b).join('-'); }; return function(x, cb) { cb(null, _prog(x)); }");

var dictListResult = await mapArrayToA(dlist);
//var stringResponseResult = await mapArrayToA(stringResponse);
var jsonResponseResult = await mapArrayToA(jsonResponse);

await closeHttpServer(null);

Console.WriteLine(dictListResult);
Console.WriteLine(jsonResponseResult);

The hardcoded List has no problem; Edge returns "def-jkl-pqr-vwx" as expected. The string version is commented out, as Edge fails to find the function "map" on it, and throws an error. The last one with the JToken returns "---" as it identifies an array of objects, but finds no content in it.

What is the best way to pass JSON data to Edge from C#?

via BM-