How can I create a unique hashcode for a JObject?

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You can use JTokenEqualityComparer.GetHashCode(JToken token) for this purpose. It provides access to the GetDeepHashCode() method you saw.

var obj = JToken.Parse(jsonString);
var comparer = new JTokenEqualityComparer();
var hashCode = comparer.GetHashCode(obj);

Note that JTokenEqualityComparer.Equals(JToken x, JToken y) calls JToken.DeepEquals() (source) so this comparer is suited for use as an IEqualityComparer<JToken> when constructing hash tables or dictionaries of LINQ-to-JSON objects and uniqueness of values is desired.

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