Merging json text into single dto - servicestack

Question

is there a mechanism in servicestack.text to merge two json strings into a single dto?
The use case is merging complex settings from multiple sources into a single settings file
i.e.
{ "blah": { "params": { "default": "bar", "misc": "0", } } }
and
{ "blah": { "params": { "value": "val", "misc": "1", } } }
becomes
{ "blah": { "params": { "default": "bar", "value": "val", "misc": "1", } } }
Thanks

Answer 1

Be careful of the trailing comma's as it's not valid JSON. But you can use the dynamic API of ServiceStack's JSON Serializer to do this:
var json1 = "{\"blah\":{\"params\":{\"default\":\"bar\", \"misc\": \"0\" } } }";
var json2 = "{\"blah\":{\"params\":{\"value\":\"val\", \"misc\": \"1\" } } }";
var jsonObj = JsonObject.Parse(json1);
var jsonParams =jsonObj.Object("blah").Object("params");
foreach (var entry in JsonObject.Parse(json2).Object("blah").Object("params"))
{
jsonParams[entry.Key] = entry.Value;
}
var to = new { blah = new { #params = jsonParams } };
to.ToJson().Print();
Which will output:
{"blah":{"params":{"default":"bar","misc":"1","value":"val"}}}

Answer 2

Well, if you don't ever going to use JsonArrays, solution above could be written in recursive way:
public static JsonObject Merge(JsonObject #this, JsonObject that) {
foreach (var entry in that) {
var exists = #this.ContainsKey (entry.Key);
if (exists) {
var otherThis = JsonObject.Parse(#this.GetUnescaped (entry.Key));
var otherThat = JsonObject.Parse(that.GetUnescaped (entry.Key));
#this [entry.Key] = Merge (otherThis, otherThat).ToJson ();
} else {
#this [entry.Key] = entry.Value;
}
}
return #this;
}