How to make json file using an array of strings?

Question

I have a array of string. I want to make a JSON file from it, mapping it to a hierarchy of nested objects using the strings as property names and final value. For example, if array contains {"A", "B", "C", "D"}, then the resultant JSON file should look like

{
  "A": {
    "B": {
      "C": "D"
       }
    }
}

Is there any way to do that?

You can achieve this by contacting string after that user serialize and deserialize. — Rony Patel
– Rony Patel, Commented Sep 30, 2019 at 6:37
Although this is possible, it surprises me this is needed anywhere... Though questions on stackoverflow surprise me a lot — TheGeneral
– TheGeneral, Commented Sep 30, 2019 at 6:41
The rule for converting from strings to JSON isn't entirely clear. Is this what you want? dotnetfiddle.net/DKaAoH — dbc
– dbc, Commented Sep 30, 2019 at 6:55

dbc · Accepted Answer · 2019-09-30 18:29:27Z

2

You can generate a nested set of JSON objects from an array of strings using LINQ and a JSON serializer (either json.net or javascriptserializer) as follows:

var input = new[]{"A","B","C","D"};

var data = input
    .Reverse()
    .Aggregate((object)null, (a, s) => a == null ? (object)s : new Dictionary<string, object>{ { s, a } });

var json = JsonConvert.SerializeObject(data, Formatting.Indented);

The algorithm works by walking the incoming sequence of strings in reverse, returning the string itself for the last item, and returning a dictionary with an entry keyed by the current item and valued by the previously returned object for subsequent items. The returned dictionary or string subsequently can be serialized to produce the desired result.

Demo fiddle here.

edited Sep 30, 2019 at 18:29

answered Sep 30, 2019 at 15:22

dbc

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