What is the JSON.NET equivalent of XML’s XPath, SelectNodes, SelectSingleNode?

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Json.NET has SelectToken. It uses a syntax similar to DataBinder.Eval to get JSON via a string expression:

JObject o = JObject.Parse("{'People':[{'Name':'Jeff'},{'Name':'Joe'}]}");

// get name token of first person and convert to a string
string name = (string)o.SelectToken("People[0].Name");

Or if you wanted to select multiple values:

JObject o = JObject.Parse("{'People':[{'Name':'Jeff','Roles':['Manager', 'Admin']}]}");

// get role array token of first person and convert to a list of strings
IList<string> names = (string)o.SelectToken("People[0].Roles").Select(t => (string)t).ToList();

Documentation: Querying JSON with SelectToken

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