Json.NET is a popular high-performance JSON framework for .NET


  • 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
  • Write indented, easy to read JSON
  • Convert JSON to and from XML
  • Supports .NET 2, .NET 3.5, .NET 4, Silverlight and Windows Phone

The serializer is a good choice when the JSON you are reading or writing maps closely to a .NET class.

LINQ to JSON is good for situations where you are only interested in getting values from JSON, you don't have a class to serialize or deserialize to, or the JSON is radically different from your class and you need to manually read and write from your objects.

Download Json.NET from CodePlex or install using NuGet



Find guides for getting started and comprehensive API Documentation here.

Feature Comparison

  Json.NET DataContractJsonSerializer JavaScriptSerializer
Supports JSON      
Supports BSON
Supports JSON Schema
Supports .NET 2.0
Supports .NET 3.5
Supports .NET 4.0      
Supports Silverlight      
Supports Windows Phone      
Open Source      
LINQ to JSON      
XPath-like JSON query syntax      
Indented JSON support
Deserializes IList, IEnumerable, ICollection, IDictionary properties
Serializes circular references
Supports serializing objects by reference
Deserializes polymorphic properties and collections
Supports including type names with JSON      
Globally customize serialization process      
Efficient name/value dictionary serialization      
Nonsensical nested objects in array dictionary serialization      
Supports excluding null values when serializing
Supports SerializationBinder
Conditional property serialization
Includes line number information in errors
Converts XML to JSON and JSON to XML
JSON Schema validation
JSON Schema generation from .NET types
Camel case JSON property names
Non-default constructors support
Serialization error handling
Supports populating an existing object
Efficiently serializes byte arrays as base64 text
Handle NaN, Infinity, -Infinity and undefined
Serializes .NET 4.0 dynamic objects
Serializes ISerializable objects
Supports serializing enums to their text name      
Supports JSON recursion limit      
Attribute property name customization      
Attribute property order customization      
Attribute property required customization      
Supports ISO8601 dates      
Supports JavaScript constructor dates      
Supports Microsoft AJAX dates      
Unquoted property names support      
Raw JSON support      
Supports reading and writing comments      
Deserializes anonymous types      
Opt-in property serialization      
Opt-out property serialization      
Efficiently stream reading and writing JSON      
Single or double quote JSON content      
Supports overriding a type's serialization      
Supports OnDeserialized, OnSerializing, OnSerialized and OnDeserializing attributes      
Supports serializing private properties      
DataMember attribute support      
MetdataType attribute support      
DefaultValue attribute support      
Serializes DataSets and DataTables      
Case-insensitive property deserialization      

This list is work in progress. Post to the discussion forum if you see anything that is missing or incorrect.

My Blog

My blog can be found at http://james.newtonking.com where I post news and updates about Json.NET.

My Twitter

My twitter account can be found at @JamesNK


Json.NET is a free open source project that I have developed in my personal time. I really appreciate your feedback and support for Json.NET and its future development.

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Last edited Feb 19, 2012 at 10:48 PM by JamesNK, version 57