How do I get formatted JSON in .NET using C#?

Question

I am using .NET JSON parser and would like to serialize my config file so it is readable. So instead of:

{"blah":"v", "blah2":"v2"}

I would like something nicer like:

{
    "blah":"v", 
    "blah2":"v2"
}

My code is something like this:

using System.Web.Script.Serialization; 

var ser = new JavaScriptSerializer();
configSz = ser.Serialize(config);
using (var f = (TextWriter)File.CreateText(configFn))
{
    f.WriteLine(configSz);
    f.Close();
}

Answer 1

First I wanted to add comment under Duncan Smart post, but unfortunately I have not got enough reputation yet to leave comments. So I will try it here.

I just want to warn about side effects.

JsonTextReader internally parses json into typed JTokens and then serialises them back.

For example if your original JSON was

 { "double":0.00002, "date":"\/Date(1198908717056)\/"}

After prettify you get

{ 
    "double":2E-05,
    "date": "2007-12-29T06:11:57.056Z"
}

Of course both json string are equivalent and will deserialize to structurally equal objects, but if you need to preserve original string values, you need to take this into concideration