Ultimate Javascript Object Signing and Encryption (JOSE) and JSON Web Token (JWT) Implementation for .NET

Minimallistic zero-dependency library for generating, decoding and encryption JSON Web Tokens. Supports full suite of JSON Web Algorithms as of July 4, 2014 version. JSON parsing agnostic, can plug any desired JSON processing library. Extensively tested for compatibility with jose.4.j, Nimbus-JOSE-JWT and json-jwt libraries.

WinRT compatible version (Windows 8.1 and Windows Phone 8.1) is avaliable here: JoseRT.

Foreword

Originally forked from https://github.com/johnsheehan/jwt . Almost re-written from scratch to support JWT encryption capabilities and unified interface for encoding/decoding/encryption and other features. Moved to separate project in February 2014.

AES Key Wrap implementation ideas and test data from http://www.cryptofreak.org/projects/rfc3394/ by Jay Miller

Supported JWA algorithms

Signing

HMAC signatures with HS256, HS384 and HS512.
ECDSA signatures with ES256, ES384 and ES512.
RSASSA-PKCS1-V1_5 signatures with RS256, RS384 and RS512.
RSASSA-PSS signatures (probabilistic signature scheme with appendix) with PS256, PS384 and PS512.
NONE (unprotected) plain text algorithm without integrity protection

Encryption

RSAES OAEP 256 (using SHA-256 and MGF1 with SHA-256) encryption with A128CBC-HS256, A192CBC-HS384, A256CBC-HS512, A128GCM, A192GCM, A256GCM
RSAES OAEP (using SHA-1 and MGF1 with SHA-1) encryption with A128CBC-HS256, A192CBC-HS384, A256CBC-HS512, A128GCM, A192GCM, A256GCM
RSAES-PKCS1-V1_5 encryption with A128CBC-HS256, A192CBC-HS384, A256CBC-HS512, A128GCM, A192GCM, A256GCM
Direct symmetric key encryption with pre-shared key A128CBC-HS256, A192CBC-HS384, A256CBC-HS512, A128GCM, A192GCM and A256GCM
A128KW, A192KW, A256KW encryption with A128CBC-HS256, A192CBC-HS384, A256CBC-HS512, A128GCM, A192GCM, A256GCM
A128GCMKW, A192GCMKW, A256GCMKW encryption with A128CBC-HS256, A192CBC-HS384, A256CBC-HS512, A128GCM, A192GCM, A256GCM
ECDH-ES^* with A128CBC-HS256, A128GCM, A192GCM, A256GCM
ECDH-ES+A128KW^*, ECDH-ES+A192KW^*, ECDH-ES+A256KW^* with A128CBC-HS256, A128GCM, A192GCM, A256GCM
PBES2-HS256+A128KW, PBES2-HS384+A192KW, PBES2-HS512+A256KW with A128CBC-HS256, A192CBC-HS384, A256CBC-HS512, A128GCM, A192GCM, A256GCM

Compression

DEFLATE compression

Notes:

* It appears that Microsoft CNG implementation of BCryptSecretAgreement/NCryptSecretAgreement contains a bug for calculating Elliptic Curve Diffie–Hellman secret agreement on keys higher than 256 bit (P-384 and P-521 NIST curves correspondingly). At least produced secret agreements do not match any other implementation in different languages. Technically it is possible to use ECDH-ES or ECDH-ES+AES Key Wrap family with A192CBC-HS384 and A256CBC-HS512 but most likely produced JWT tokens will not be compatible with other platforms and therefore can't be decoded correctly.

Installation

NuGet

Install-Package jose-jwt

Manual

Grab source and compile yourself.

Usage

Creating Plaintext (unprotected) Tokens

var payload = new Dictionary<string, object>() 
{
    { "sub", "[email protected]" },
    { "exp", 1300819380 }
};

string token = Jose.JWT.Encode(payload, null, JwsAlgorithm.none);

Creating signed Tokens

HS-* family

HS256, HS384, HS512 signatures require byte[] array key of corresponding length

var payload = new Dictionary<string, object>() 
{
    { "sub", "[email protected]" },
    { "exp", 1300819380 }
};

var secretKey = new byte[]{164,60,194,0,161,189,41,38,130,89,141,164,45,170,159,209,69,137,243,216,191,131,47,250,32,107,231,117,37,158,225,234};

string token=Jose.JWT.Encode(json, secretKey, JwsAlgorithm.HS256);

RS-* and PS-* family

RS256, RS384, RS512 and PS256, PS384, PS512 signatures require RSACryptoServiceProvider (usually private) key of corresponding length. CSP need to be forced to use Microsoft Enhanced RSA and AES Cryptographic Provider. Which usually can be done be re-importing RSAParameters. See http://clrsecurity.codeplex.com/discussions/243156 for details.

var payload = new Dictionary<string, object>() 
{
    { "sub", "[email protected]" },
    { "exp", 1300819380 }
};

var privateKey=new X509Certificate2("my-key.p12", "password", X509KeyStorageFlags.Exportable | X509KeyStorageFlags.MachineKeySet).PrivateKey as RSACryptoServiceProvider;

string token=Jose.JWT.Encode(json, privateKey, JwsAlgorithm.RS256);

ES-* family

ES256, ES384, ES256 ECDSA signatures requires CngKey (usually private) elliptic curve key of corresponding length. Normally existing CngKey loaded via CngKey.Open(..) method from Key Storage Provider. But if you want to use raw key material (x,y) and d, jose-jwt provides convenient helper EccKey.New(x,y,d).

var payload = new Dictionary<string, object>() 
{
    { "sub", "[email protected]" },
    { "exp", 1300819380 }
};

byte[] x = { 4, 114, 29, 223, 58, 3, 191, 170, 67, 128, 229, 33, 242, 178, 157, 150, 133, 25, 209, 139, 166, 69, 55, 26, 84, 48, 169, 165, 67, 232, 98, 9 };
byte[] y = { 131, 116, 8, 14, 22, 150, 18, 75, 24, 181, 159, 78, 90, 51, 71, 159, 214, 186, 250, 47, 207, 246, 142, 127, 54, 183, 72, 72, 253, 21, 88, 53 };
byte[] d = { 42, 148, 231, 48, 225, 196, 166, 201, 23, 190, 229, 199, 20, 39, 226, 70, 209, 148, 29, 70, 125, 14, 174, 66, 9, 198, 80, 251, 95, 107, 98, 206 };

var privateKey=EccKey.New(x, y, d);

string token=Jose.JWT.Encode(json, privateKey, JwsAlgorithm.ES256);

Creating encrypted Tokens

RSA-* key management family of algorithms

RSA-OAEP-256, RSA-OAEP and RSA1_5 key management requires RSACryptoServiceProvider (usually public) key of corresponding length.

var payload = new Dictionary<string, object>() 
{
    { "sub", "[email protected]" },
    { "exp", 1300819380 }
};

var publicKey=new X509Certificate2("my-key.p12", "password").PublicKey.Key as RSACryptoServiceProvider;

string token = Jose.JWT.Encode(json, publicKey, JweAlgorithm.RSA_OAEP, JweEncryption.A256GCM);

DIR direct pre-shared symmetric key family of algorithms

Direct key management with pre-shared symmetric keys requires byte[] array key of corresponding length

var payload = new Dictionary<string, object>() 
{
    { "sub", "[email protected]" },
    { "exp", 1300819380 }
};

var secretKey = new byte[]{164,60,194,0,161,189,41,38,130,89,141,164,45,170,159,209,69,137,243,216,191,131,47,250,32,107,231,117,37,158,225,234};

string token = Jose.JWT.Encode(json, secretKey, JweAlgorithm.DIR, JweEncryption.A128CBC_HS256);

AES Key Wrap key management family of algorithms

AES128KW, AES192KW and AES256KW key management requires byte[] array key of corresponding length

var payload = new Dictionary<string, object>() 
{
    { "sub", "[email protected]" },
    { "exp", 1300819380 }
};

var secretKey = new byte[]{164,60,194,0,161,189,41,38,130,89,141,164,45,170,159,209,69,137,243,216,191,131,47,250,32,107,231,117,37,158,225,234};

string token = Jose.JWT.Encode(json, secretKey, JweAlgorithm.A256KW, JweEncryption.A256CBC_HS512);

AES GCM Key Wrap key management family of algorithms

AES128GCMKW, AES192GCMKW and AES256GCMKW key management requires byte[] array key of corresponding length

var payload = new Dictionary<string, object>() 
{
    { "sub", "[email protected]" },
    { "exp", 1300819380 }
};

var secretKey = new byte[]{164,60,194,0,161,189,41,38,130,89,141,164,45,170,159,209,69,137,243,216,191,131,47,250,32,107,231,117,37,158,225,234};

string token = Jose.JWT.Encode(json, secretKey, JweAlgorithm.A256GCMKW, JweEncryption.A256CBC_HS512);

ECDH-ES and ECDH-ES with AES Key Wrap key management family of algorithms

ECDH-ES and ECDH-ES+A128KW, ECDH-ES+A192KW, ECDH-ES+A256KW key management requires CngKey (usually public) elliptic curve key of corresponding length. Normally existing CngKey loaded via CngKey.Open(..) method from Key Storage Provider. But if you want to use raw key material (x,y) and d, jose-jwt provides convenient helper EccKey.New(x,y,usage:CngKeyUsages.KeyAgreement).

var payload = new Dictionary<string, object>() 
{
    { "sub", "[email protected]" },
    { "exp", 1300819380 }
};

byte[] x = { 4, 114, 29, 223, 58, 3, 191, 170, 67, 128, 229, 33, 242, 178, 157, 150, 133, 25, 209, 139, 166, 69, 55, 26, 84, 48, 169, 165, 67, 232, 98, 9 };
byte[] y = { 131, 116, 8, 14, 22, 150, 18, 75, 24, 181, 159, 78, 90, 51, 71, 159, 214, 186, 250, 47, 207, 246, 142, 127, 54, 183, 72, 72, 253, 21, 88, 53 };

var publicKey=EccKey.New(x, y, usage:CngKeyUsages.KeyAgreement);

string token = Jose.JWT.Encode(json, publicKey, JweAlgorithm.ECDH_ES, JweEncryption.A256GCM);

PBES2 using HMAC SHA with AES Key Wrap key management family of algorithms

PBES2-HS256+A128KW, PBES2-HS384+A192KW, PBES2-HS512+A256KW key management requires string passphrase from which key will be derived

var payload = new Dictionary<string, object>() 
{
    { "sub", "[email protected]" },
    { "exp", 1300819380 }
};  	

string token = Jose.JWT.Encode(json, "top secret", JweAlgorithm.A256KW, JweEncryption.A256CBC_HS512);

Optional compressing payload before encrypting

Optional DEFLATE compression is supported

var payload = new Dictionary<string, object>() 
{
    { "sub", "[email protected]" },
    { "exp", 1300819380 }
};

var publicKey=new X509Certificate2("my-key.p12", "password").PublicKey.Key as RSACryptoServiceProvider;

string token = Jose.JWT.Encode(json, publicKey, JweAlgorithm.RSA1_5, JweEncryption.A128CBC_HS256, JweCompression.DEF);

Verifying and Decoding Tokens

Decoding json web tokens is fully symmetric to creating signed or encrypted tokens:

HS256, HS384, HS512 signatures, A128KW, A192KW, A256KW, A128GCMKW, A192GCMKW, A256GCMKW and DIR key management algorithms expects byte[] array key

string token = "eyJhbGciOiJkaXIiLCJlbmMiOiJBMjU2R0NNIn0..Fmz3PLVfv-ySl4IJ.LMZpXMDoBIll5yuEs81Bws2-iUUaBSpucJPL-GtDKXkPhFpJmES2T136Vd8xzvp-3JW-fvpRZtlhluqGHjywPctol71Zuz9uFQjuejIU4axA_XiAy-BadbRUm1-25FRT30WtrrxKltSkulmIS5N-Nsi_zmCz5xicB1ZnzneRXGaXY4B444_IHxGBIS_wdurPAN0OEGw4xIi2DAD1Ikc99a90L7rUZfbHNg_iTBr-OshZqDbR6C5KhmMgk5KqDJEN8Ik-Yw.Jbk8ZmO901fqECYVPKOAzg";

byte[] secretKey=new byte[]{164,60,194,0,161,189,41,38,130,89,141,164,45,170,159,209,69,137,243,216,191,131,47,250,32,107,231,117,37,158,225,234};

string json = Jose.JWT.Decode(token, secretKey);

RS256, RS384, RS512, PS256, PS384, PS512 signatures and RSA-OAEP-256, RSA-OAEP, RSA1_5 key management algorthms expects RSACryptoServiceProvider as a key, public/private is asymmetric to encoding:

string token = "eyJhbGciOiJSU0ExXzUiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0.bx_4TL7gh14IeM3EClP3iVfY9pbT81pflXd1lEZOVPJR6PaewRFXWmiJcaqH9fcU9IjGGQ19BS-UPtpErenL5kw7KORFgIBm4hObCYxLoAadMy8A-qQeOWyjnxbE0mbQIdoFI4nGK5qWTEQUWZCMwosvyeHLqEZDzr9CNLAAFTujvsZJJ7NLTkA0cTUzz64b57uSvMTaOK6j7Ap9ZaAgF2uaqBdZ1NzqofLeU4XYCG8pWc5Qd-Ri_1KsksjaDHk12ZU4vKIJWJ-puEnpXBLoHuko92BnN8_LXx4sfDdK7wRiXk0LU_iwoT5zb1ro7KaM0hcfidWoz95vfhPhACIsXQ.YcVAPLJ061gvPpVB-zMm4A.PveUBLejLzMjA4tViHTRXbYnxMHFu8W2ECwj9b6sF2u2azi0TbxxMhs65j-t3qm-8EKBJM7LKIlkAtQ1XBeZl4zuTeMFxsQ0VShQfwlN2r8dPFgUzb4f_MzBuFFYfP5hBs-jugm89l2ZTj8oAOOSpAlC7uTmwha3dNaDOzlJniqAl_729q5EvSjaYXMtaET9wSTNSDfMUVFcMERbB50VOhc134JDUVPTuriD0rd4tQm8Do8obFKtFeZ5l3jT73-f1tPZwZ6CmFVxUMh6gSdY5A.tR8bNx9WErquthpWZBeMaw";

var privateKey=new X509Certificate2("my-key.p12", "password", X509KeyStorageFlags.Exportable | X509KeyStorageFlags.MachineKeySet).PrivateKey as RSACryptoServiceProvider;

string json = Jose.JWT.Decode(token,privateKey);

ES256, ES284, ES512 signatures, ECDH-ES and ECDH-ES+A128KW, ECDH-ES+A192KW, ECDH-ES+A256KW key management algorithms expects CngKey as a key, public/private is asymmetric to encoding. If EccKey.New(...) wrapper is used, make sure correct usage: value is set. CngKeyUsages.KeyAgreement for ECDH-ES and CngKeyUsages.Signing for ES-* (default value, can be ommited).

string token = "eyJhbGciOiJFUzI1NiIsImN0eSI6InRleHRcL3BsYWluIn0.eyJoZWxsbyI6ICJ3b3JsZCJ9.EVnmDMlz-oi05AQzts-R3aqWvaBlwVZddWkmaaHyMx5Phb2NSLgyI0kccpgjjAyo1S5KCB3LIMPfmxCX_obMKA";

byte[] x = { 4, 114, 29, 223, 58, 3, 191, 170, 67, 128, 229, 33, 242, 178, 157, 150, 133, 25, 209, 139, 166, 69, 55, 26, 84, 48, 169, 165, 67, 232, 98, 9 };
byte[] y = { 131, 116, 8, 14, 22, 150, 18, 75, 24, 181, 159, 78, 90, 51, 71, 159, 214, 186, 250, 47, 207, 246, 142, 127, 54, 183, 72, 72, 253, 21, 88, 53 };

var publicKey=EccKey.New(x, y);

string json = Jose.JWT.Decode(token,publicKey);

PBES2-HS256+A128KW, PBES2-HS384+A192KW, PBES2-HS512+A256KW key management algorithms expects string passpharase as a key

string token = "eyJhbGciOiJQQkVTMi1IUzI1NitBMTI4S1ciLCJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwicDJjIjo4MTkyLCJwMnMiOiJiMFlFVmxMemtaNW9UUjBMIn0.dhPAhJ9kmaEbP-02VtEoPOF2QSEYM5085V6zYt1U1qIlVNRcHTGDgQ.4QAAq0dVQT41dQKDG7dhRA.H9MgJmesbU1ow6GCa0lEMwv8A_sHvgaWKkaMcdoj_z6O8LaMSgquxA-G85R_5hEILnHUnFllNJ48oJY7VmAJw0BQW73dMnn58u161S6Ftq7Mjxxq7bcksWvFTVtG5RsqqYSol5BZz5xm8Fcj-y5BMYMvrsCyQhYdeGEHkAvwzRdvZ8pGMsU2XPzl6GqxGjjuRh2vApAeNrj6MwKuD-k6AR0MH46EiNkVCmMkd2w8CNAXjJe9z97zky93xbxlOLozaC3NBRO2Q4bmdGdRg5y4Ew.xNqRi0ouQd7uo5UrPraedg";

string json = Jose.JWT.Decode(token, "top secret");

Additional utilities

Adding extra headers

jose-jwt allows to pass extra headers when encoding token to overide deafault values^*. extraHeaders: named param can be used, it accepts IDictionary<string, object> type. jose-jwt is NOT allow to override alg and enc headers .

var payload = new Dictionary<string, object>() 
{
     { "sub", "[email protected]" },
     { "exp", 1300819380 }
};
  
var headers = new Dictionary<string, object>() 
{
     { "typ", "JWT" },
     { "cty", "JWT" },
     { "keyid", "111-222-333"}
};

var secretKey = new byte[]{164,60,194,0,161,189,41,38,130,89,141,164,45,170,159,209,69,137,243,216,191,131,47,250,32,107,231,117,37,158,225,234};

string token = Jose.JWT.Encode(json, secretKey, JweAlgorithm.A256GCMKW, JweEncryption.A256CBC_HS512, extraHeaders: headers);

var payload = new Dictionary<string, object>() 
{
    { "sub", "[email protected]" },
    { "exp", 1300819380 }
};
	
var headers = new Dictionary<string, object>() 
{
     { "typ", "JWT" },
     { "cty", "JWT" },
     { "keyid", "111-222-333"}
};

var privateKey=new X509Certificate2("my-key.p12", "password", X509KeyStorageFlags.Exportable | X509KeyStorageFlags.MachineKeySet).PrivateKey as RSACryptoServiceProvider;

string token=Jose.JWT.Encode(json, privateKey, JwsAlgorithm.RS256, extraHeaders: headers);

* For backwards compatibility signing uses pre-configured typ: 'JWT' header by default.

Two-phase validation

In some cases validation (decoding) key can be unknown prior to examining token content. For instance one can use different keys per token issuer or rely on headers information to determine which key to use, do logging or other things.

jose-jwt provides helper methods to examine token content without performing actual integrity validation or decryption.

IDictionary<string, object> Jose.JWT.Headers(String token) to return header information as dictionary and T Jose.JWT.Headers<T>(string token) to return headers information as unmarshalled type.

string Jose.JWT.Payload(string token) to return unparsed payload and T Jose.JWT.Payload<T>(string token) to return unmarshalled payload type. Those 2 methods works only with signed tokens and will throw JoseException when applied on encrypted token.

Security warning: please note, you should NOT rely on infromation extracted by given helpers without performing token validation as second step.

Below are couple examples on how two-phase validation can be implemented with jose-jwt:

//step 1a: get headers info
var headers = Jose.JWT.Headers(token);

//step 1b: lookup validation key based on header info
var key = FindKey(headers["keyid"]);

//step 2: perform actual token validation
var payload = Jose.JWT.Decode(token, key);

//step 1a: get payload as custom JwtToken object
var jwt = Jose.JWT.Payload<JwtToken>(token);

//step 1b: lookup validation key based on issuer
var key = FindKeyByIssuer(jwt.Iss);

//step 2: perform actual token validation
var payload = Jose.JWT.Decode<JwtToken>(token, key);

Parsing and mapping json to object model directly

jose-jwt library is agnostic about object model used to represent json payload as well as underlying framework used to serialize/parse json objects. Library provides convinient generic methods to work directly with your object model:

MyDomainObject obj=Jose.JWT.Decode<MyDomainObject>(token,secretKey); //will invoke configured IJsonMapper to perform parsing/mapping of content to MyDomainObject 

string data=Jose.JWT.Encode(obj,secrectKey,JwsAlgorithm.HS256); //for object argument configured IJsonMapper will be invoked to serialize object to json string before encoding

Customizing json <-> object parsing & mapping

The library provides simple Jose.IJsonMapper interface to plug any json processing library or customize default behavior. The only requirement for mapping implementations is ability to correctly serialize/parse IDictionary<string,object> type.

The default supplied Jose.IJsonMapper implementation is based on System.Web.Script.Serialization.JavaScriptSerializer.

Example of Newtonsoft.Json mapper

public class NewtonsoftMapper : IJsonMapper
{
    public string Serialize(object obj)
    {
         var settings = new JsonSerializerSettings
         {
         	ContractResolver = new DictionaryKeysResolver(),
         	NullValueHandling = NullValueHandling.Ignore,                                                              
         };

        return JsonConvert.SerializeObject(obj, Formatting.Indented, settings);		
    }

    public T Parse<T>(string json)
    {
        var settings = new JsonSerializerSettings
        {
            ContractResolver = new DictionaryKeysResolver(),
            NullValueHandling = NullValueHandling.Ignore,
        };

        return JsonConvert.DeserializeObject<T>(json, settings);
    }
}

Jose.JWT.JsonMapper = new NewtonsoftMapper();

Example of ServiceStack mapper

public class ServiceStackMapper : IJsonMapper
{
    public string Serialize(object obj)
    {
        return ServiceStack.Text.JsonSerializer.SerializeToString(obj);
    }

    public T Parse<T>(string json)
    {
        return ServiceStack.Text.JsonSerializer.DeserializeFromString<T>(json);
    }
}

Jose.JWT.JsonMapper = new ServiceStackMapper();

More examples

Checkout UnitTests\TestSuite.cs for more examples.

Name		Name	Last commit message	Last commit date
Latest commit History 90 Commits
JWT		JWT
UnitTests		UnitTests
tools		tools
.gitignore		.gitignore
JWT.sln		JWT.sln
JWT35.sln		JWT35.sln
LICENSE		LICENSE
README.md		README.md
build-nupkg.cmd		build-nupkg.cmd
jose-jwt.nuspec		jose-jwt.nuspec

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Ultimate Javascript Object Signing and Encryption (JOSE) and JSON Web Token (JWT) Implementation for .NET

Foreword

Supported JWA algorithms

Notes:

Installation

NuGet

Manual

Usage

Creating Plaintext (unprotected) Tokens

Creating signed Tokens

HS-* family

RS-* and PS-* family

ES-* family

Creating encrypted Tokens

RSA-* key management family of algorithms

DIR direct pre-shared symmetric key family of algorithms

AES Key Wrap key management family of algorithms

AES GCM Key Wrap key management family of algorithms

ECDH-ES and ECDH-ES with AES Key Wrap key management family of algorithms

PBES2 using HMAC SHA with AES Key Wrap key management family of algorithms

Optional compressing payload before encrypting

Verifying and Decoding Tokens

Additional utilities

Adding extra headers

Two-phase validation

Parsing and mapping json to object model directly

Customizing json <-> object parsing & mapping

Example of Newtonsoft.Json mapper

Example of ServiceStack mapper

More examples

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adamduffy/jose-jwt

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Repository files navigation

Ultimate Javascript Object Signing and Encryption (JOSE) and JSON Web Token (JWT) Implementation for .NET

Foreword

Supported JWA algorithms

Notes:

Installation

NuGet

Manual

Usage

Creating Plaintext (unprotected) Tokens

Creating signed Tokens

HS-* family

RS-* and PS-* family

ES-* family

Creating encrypted Tokens

RSA-* key management family of algorithms

DIR direct pre-shared symmetric key family of algorithms

AES Key Wrap key management family of algorithms

AES GCM Key Wrap key management family of algorithms

ECDH-ES and ECDH-ES with AES Key Wrap key management family of algorithms

PBES2 using HMAC SHA with AES Key Wrap key management family of algorithms

Optional compressing payload before encrypting

Verifying and Decoding Tokens

Additional utilities

Adding extra headers

Two-phase validation

Parsing and mapping json to object model directly

Customizing json <-> object parsing & mapping

Example of Newtonsoft.Json mapper

Example of ServiceStack mapper

More examples

About

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