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Javascript Json Deserialization

Javascript Json Deserialization Average ratng: 4,7/5 6480 reviews
I was looking around for a simple example which would just do a object serialization to a JSON format, and then deserializing back to the original object. I found few examples on MSDN, but did seem to be too long to try. Here I’ve given a simple code which would make your understanding easy, and simpler.

Before going into the code, let us first understand what is JSON, and what is its significance in the modern world of web applications.

In our JavaScript example, we can serialize the usersObject by passing it into the JSON.stringify function, as we do below.

What is JSON?

JSON is another format of expressing data, just like XML. But, JSON is very simpler than XML, and tiny than XML. So, it is becoming popular in the web world to choose the JSON notation over XML since JSON notation are usually shorter, and less data to be transmitted if at all they were to be.

Okay, I understood a little about JSON. Give me an example!




I know an example will get your understanding much better. Below is a simple example of how an object can be expressed in JSON notation. Let’s take a classical example of a Person object, and expressing myself as an object.


“firstName”: “Rakki”,

“department”:”Microsoft PSS”,

“addressline1”: “Microsoft India GTSC”,

“city”: “Bangalore”,

“country”: “India”,

}

“technologies”: [“IIS”, “ASP.NET”,“JavaScript”,“AJAX”]


In the above example, address is another object inside my Person, and technologies is an array or strings.

Express this as a simple .NET class, please!






I get it. Now what? JSON Serialization / Deserialization?



I’m sure you do not want me to write what is serialization, and deserialization here. I’ll touch upon how to use System.Web.Script.Serialization.JavaScriptSerializer to convert an existing object into a JSON string.




Above code just creates a Person object, and assign some values. Look at the last line where we are actually doing a serialization – means dumping the contents of the object to a JSON notation. Below is the string produced by the above code:



{'firstName':'Rakki','lastName':'Muthukumar','department':'Microsoft PSS','address':{'addressline1':'Microsoft India GTSC','addressline2':'PSS - DSI','city':'Bangalore','state':'Karnataka','country':'India','pin':560028},'technologies':['IIS','ASP.NET','JavaScript','AJAX']}


It is the same as how we defined the object before – but in a single line. Now, you have successfully converted your object into a JSON string.


Now how do I deserialize it?


Before going into how to deserialize it, let’s just understand when you might want to deserialize the object. Classical example is a JSON object returned from a web service, or from your client side javascript code, and you will be able to deserialize it in the server side to use the received object.




p2.lastName would contain “Muthukumar” if your deserialization works fine. I suggest you to use the Deserialize<T> method since it will reduce the type casting you might be doing if you use DeserializeObject() method which returns a System.Object.


Hope this helps!

Nowadays, we are dealing with JSON data mostly when receiving data in JSON formatfrom a web service and getting data from it. To accomplish getting data from JSON or creating JSON text from a custom object we will use JSON serialization and deserialization in C#.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight assembly. An object begins with '{' and ends with '}'. Behind each 'name', there is a colon. And comma is used to separate much 'name/value'. For example,
  • Array

Value order set. An array begins with '[' and end with ']'. And values are separated with commas. For example,

  • String

Any quantity Unicode character assembly which is enclosed with quotation marks. It uses backslash to escape.

We can implement JSON Serialization/Deserialization in the following three ways:
  • Using JavaScriptSerializer class
  • Using DataContractJsonSerializer class
  • Using JSON.NET library

Using JavaScriptJsonSerializer

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JavaScriptSerializer is a class which helps to serialize and deserialize JSON. It is present in namespace System.Web.Script.Serialization which is available in assembly System.Web.Extensions.dll. To serialize a .Net object to JSON string use Serialize method. It's possible to deserialize JSON string to .Net object using Deserialize<T> or DeserializeObject methods. Let's see how to implement serialization and deserialization using JavaScriptSerializer.
Following code snippet is to declare custom class of Blog type.
In Serialization, it converts a custom .Net object to a JSON string. In the following code, it creates an instance of Blog class and assigns some values to its properties. Then we create an instance of JavaScriptSerializer and call Serialize() method by passing object(Blog). It returns JSON data in string format.
In Deserialization, it does the opposite of Serialization which means it converts JSON string to custom .Net object. In the following code, it creates JavaScriptSerializer instance and calls Deserialize() by passing JSON data. It returns custom object (Blog) from JSON data.
DataContractJsonSerializer class helps to serialize and deserialize JSON. It is present in namespace System.Runtime.Serialization.Json which is available in assembly System.Runtime.Serialization.dll. Using the class we can serialize an object into JSON data and deserialize JSON data into an object.
Let's say there is Employee class with properties such as name, address and property values also assigned. Now we can convert the Employee class instance to JSON document. This JSON document can be deserialized into the Employee class or another class with an equivalent data contract. The following code snippets demonstrate about serialization and deserialization.
Let's create a custom class Blog for serialization and deserialization,
In Serialization, it converts a custom .Net object to a JSON string. In the following code, it creates an instance of Blog class and assigns values to its properties. Then we create an instance of DataContractJsonSerializer class by passing the parameter Blog class and create an instance of MemoryStream class to write object(Blog). Lastly it creates an instance of StreamReader class to read JSON data from MemorySteam object.
In Deserialization, it does the opposite of Serialization, which means it converts JSON string to a custom .Net object. In the following code, it creates an instance of Blog class and assigns values to its properties. Then we create an instance of DataContractJsonSerializer class by passing the parameter Blog class and creating an instance of MemoryStream class to write object(Blog). Lastly it creates an instance of StreamReader class to read JSON data from MemorySteam object.
Json.NET is a third party library which helps conversion between JSON text and .NET object using the JsonSerializer. The JsonSerializer converts .NET objects into their JSON equivalent text and back again by mapping the .NET object property names to the JSON property names. It is open source software and free for commercial purposes.
The following are some awesome features,
  • Flexible JSON serializer for converting between .NET objects and JSON.
  • LINQ to JSON for manually reading and writing JSON.
  • High performance, faster than .NET's built-in JSON serializers.
  • Easy to read JSON.
  • Convert JSON to and from XML.
  • Supports .NET 2, .NET 3.5, .NET 4, Silverlight and Windows Phone.
Let’s start learning how to install and implement:
In Visual Studio, go to Tools Menu -> Choose Library Package Manger -> Package Manager Console. It opens a command window where we need to put the following command to install Newtonsoft.Json.
Install-Package Newtonsoft.Json
In Visual Studio, Tools menu -> Manage Nuget Package Manger Solution and type “JSON.NET” to search it online. Here's the figure,
Serialization
In Serialization, it converts a custom .Net object to a Json string. In the following code, it creates an instance of Blog class and assigns some values to its properties. Then it calls static method SerializeObject() of JsonConvert class by passing object(Blog). It returns JSON data in string format.
In Deserialization, it does the opposite of Serialization which means it converts JSON string to custom .Net object. In the following code, it calls static method DeserializeObject() of JsonConvert class by passing JSON data. It returns custom object (Blog) from JSON data.