Newtonsoft JSON.net deserialization error where fields in JSON change order

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Set JsonSerializerSettings.MetadataPropertyHandling = MetadataPropertyHandling.ReadAhead.

According to the documentation:

This sample deserializes JSON with MetadataPropertyHandling set to ReadAhead so that metadata properties do not need to be at the start of an object.

 string json = @"{
  'Name': 'James',
  'Password': 'Password1',
  '$type': 'MyNamespace.User, MyAssembly'
}";

object o = JsonConvert.DeserializeObject(json, new JsonSerializerSettings
{
    TypeNameHandling = TypeNameHandling.All,
    // $type no longer needs to be first
    MetadataPropertyHandling = MetadataPropertyHandling.ReadAhead
});

Note that this setting will impact performance.

Finally, when using TypeNameHandling, do take note of this caution from the Newtonsoft docs:

TypeNameHandling should be used with caution when your application deserializes JSON from an external source. Incoming types should be validated with a custom SerializationBinder when deserializing with a value other than None.

For a discussion of why this may be necessary, see TypeNameHandling caution in Newtonsoft Json.

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