How to search JSON string for fields?

Question

I have a JSON string: [{"number":"123-456-789","array":["1", "2"]}]. I want check to see if this JSON contains a "number" field. What I am trying:

string jsonString = [{"number":"123-456-789","array":["1", "2"]}];
Newtonsoft.Json.Linq.JArray jsonObject = JArray.Parse(jsonString);

How do I then "search" this jsonObject for a specified field?

once it's decoded, then it's some kind of native object, not a string. you'd use the same iteration methods for that object as you would any other. — Marc B
– Marc B, Commented Jun 30, 2014 at 18:44
Feel free to recommend a method that does not rely on the "Newtonsoft" library :) Oh god, why? That's often considered THE best JSON library for .NET out there. — mason
– mason, Commented Jun 30, 2014 at 18:45
Are you able to represent the JSON with a .NET POCO and use JavaScriptSerializer.Deserialize() ? see link Then it's a matter of inspecting the POCO. — Mario J Vargas
– Mario J Vargas, Commented Jun 30, 2014 at 18:51

Mike Hixson · Accepted Answer · 2014-06-30 19:58:44Z

5

If you would like to test if the "number" property exists, then you can use:

bool exists = jsonObject[0].Children<JProperty>().Any(p => p.Name == "number");

If you want to get the value of the "number" property, then you can use

string number = jsonObject[0]["number"].Value<string>();

Edit Here is how to get the "array" property

string[] arr = jsonObject[0]["array"].Values<string>().ToArray();

edited Jun 30, 2014 at 19:58

answered Jun 30, 2014 at 19:04

Mike Hixson

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Comments

Darek · Accepted Answer · 2014-06-30 18:56:41Z

1

Like this:

        var isThereNumber = jsonObject[0]["number"];
        var isThereNumber2 = jsonObject[0]["number2"];

Cheers

answered Jun 30, 2014 at 18:56

Darek

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