JSON.NET JObject key comparison case-insensitive

Question

I'm using Newtonsoft Json.net to parse the JSON string. I convert the string into the JObject. When access the value of the element by the key, I want to the comparison is case-insensitive. In the code below, I use "FROM" as the key. I want it returns string "1" at the line json["FROM"].ToString(). But it fails. Is it possible to make the code below work?

String ptString = "{from: 1, to: 3}";
var json = (JObject)JsonConvert.DeserializeObject(ptString);

String f = json["FROM"].ToString();

Refer to [this answer](http://stackoverflow.com/a/2738375/578843) that this is wanted according the JSON-RPC spec (keys are case sensitive!). — Styxxy, Aug 21 '12 at 13:30
Couldnt you create some logic with .toUpper or .toLower in one of the ends? — Ademar, Aug 21 '12 at 15:36
You really should consider updating the accepted answer to the top voted one: https://stackoverflow.com/a/20475542/67824 — Ohad Schneider, Oct 10 '18 at 13:42

Gian Marco · Answer 1 · 2021-01-17T09:03:59.873

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This should work:

var json = @"{UPPER: 'value'}";
var jObj = JObject.Parse(json);
var upper = jObj.GetValue("upper", StringComparison.OrdinalIgnoreCase)?.Value<string>();

Console.WriteLine(upper); // value

edited Jan 17 '21 at 09:03

answered Dec 09 '13 at 16:26

Gian Marco

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Same thing does not seem to be available for the SelectToken methods. – Jacques Bosch Jul 10 '15 at 12:35
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Yeah, I had to manually get the JToken ignoring the casing, then find it's parent name in order to set a property while ignoring property name casing. – Austin Salgat Jan 28 '16 at 21:35
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I used this answer and altered slightly to: var value = o.GetValue("upper", StringComparison.OrdinalIgnoreCase)?.Value(); to handle null reference exception for when the key is not in the json. – Casey O'Brien Nov 16 '17 at 16:26
@CaseyO'Brien exactly, I also followed that route. This is the best solution to the stated problem. – Ali Haider Mar 15 '18 at 13:34
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Updated snipped according to @CaseyO'Brien suggestion – Gian Marco Mar 16 '18 at 07:47
I think it is very good than accepted answer – Ramil Aliyev 007 Mar 02 '21 at 06:55

score 15 · Accepted Answer · edited Jul 23 '15 at 17:23

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c# allows you to use dictionaries with keys that are case insensitive, so a workaround I've used is to convert the JObject to a dictionary with StringComparer.CurrentCultureIgnoreCase set, like so:

JObject json = (JObject)JsonConvert.DeserializeObject(ptString);
Dictionary<string, object> d = new Dictionary<string, object>(json.ToObject<IDictionary<string, object>>(), StringComparer.CurrentCultureIgnoreCase);

String f = d["FROM"].ToString();

edited Jul 23 '15 at 17:23

cecilphillip

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answered Jun 26 '13 at 22:57

ForeverWintr

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The downside of this approach is that you lose the ability of getting anything below "level 1", meaning you cant get any nested property. – Jul 13 '13 at 11:33
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I don't see that so much of a downside. Unless you are not using an Azure API or auto generated Swagger JSON, there should be little to no issue with the depth. All of that is calculated and classes are created to handle the nesting in the correct order. This adds a slight amount of overhead depending on the object, but overall, I find this to be quite useful. In my case, the documentation that the Web Client was created from changed their property casing... again. Since they don't adhere to their own "contract," something like this prevents me having to go back and fix the code each time. – Anthony Mason Aug 26 '16 at 19:55
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I'd suggest using this instead: var dictionary = new Dictionary(jo.ToObject>(), StringComparer.CurrentCultureIgnoreCase) as it allows the use of .ToObject on the returned value, unlike the answer. – Chris Peacock Jan 22 '19 at 18:27

JSON.NET JObject key comparison case-insensitive

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