Leveraging JWT Tokens(C# code) in Dynamics 365 Finance: A Comprehensive Guide

Hello friends! Recently, I came across an intriguing query in the developer community, revolving around the generation of JWT tokens using C# and their utilization as a DLL in Dynamics 365 Finance. This topic sparked my curiosity, and I delved deep into the subject to uncover the possibilities and benefits that JWT tokens can offer in the realm of D365 Finance integration. In this blog post, we will explore the ins and outs of JWT token generation, understand their significance in the context of D365 Finance, and discover how we can leverage them effectively as a DLL component.


The Power of JWT Tokens: Before we delve into the technical details, let's understand the concept of JWT tokens and their significance in modern application development. JSON Web Tokens (JWTs) are compact and self-contained tokens that securely transmit information between two parties. They are commonly used for authentication, authorization, and data exchange in distributed systems. With their ability to store claims and ensure integrity, JWT tokens have become a popular choice for secure communication between systems.

Generating JWT Tokens in C#: Now, let's explore how we can generate JWT tokens using C# code. To kickstart the process, we need to ensure we have the necessary dependencies and libraries in place. In this scenario, we'll utilize the standard out-of-the-box referenced DLLs in the AOS Service's BIN folder, along with a third-party library called Bouncy Castle Cryptography. With these in place, we can proceed to write the code for JWT token generation. Here's a sample code snippet to get you started:

public string GenerateJwtToken(string issuer, string privateKey, Dictionary<string, object> additionalClaims = null)


    string jwt = string.Empty; 



        var header = new Dictionary<string, object> { { "alg", "RS256" }, { "typ", "jwt" } };


        var currentTimeInSeconds = DateTimeOffset.UtcNow.ToUnixTimeSeconds();

        var payload = new JwtPayload


            { "iss", issuer }


        if (additionalClaims != null)


            foreach (var claim in additionalClaims)


                payload.Add(claim.Key, claim.Value);



        var privateKeyBytes = Encoding.ASCII.GetBytes(privateKey); 

        var privateKey = LoadPrivateKey(privateKeyBytes); 

        var rsa = RSA.Create();


        var header1 = new JwtHeader(new SigningCredentials(

            new RsaSecurityKey(rsa),


        var token = new JwtSecurityToken(header1, payload); 

        var jwtHandler = new JwtSecurityTokenHandler();

        jwt = jwtHandler.WriteToken(token);


    catch (Exception ex)    


        // Handle the exception here or log the error message

        // ErrorStr = ErrorStr.Length > 0 ? ErrorStr += '\n' + ex.Message : ex.Message;


    return jwt;


Leveraging JWT Tokens in Dynamics 365 Finance: With our JWT token generation code in place, we can now explore how to leverage these tokens in the context of Dynamics 365 Finance. As a DLL component, we can integrate JWT token-based authentication and authorization mechanisms seamlessly into our D365 Finance implementation. This opens up a world of possibilities, allowing us to secure APIs, authenticate users, and authorize access to specific functionalities within the system. By leveraging the power of JWT tokens, we can enhance the security and flexibility of our D365 Finance solution.

In this blog post, we embarked on an exciting journey into the realm of JWT tokens and their integration in Dynamics 365 Finance. We explored the basics of JWT token generation using C# code, along with the necessary dependencies and libraries. Additionally, we discussed the significance of JWT tokens in the context of D365 Finance and the various use cases where they can be leveraged effectively. By harnessing the power of JWT tokens, we can enhance the security and efficiency of our Dynamics 365 Finance implementations.

I hope this blog post has provided you with valuable insights into the generation and utilization of JWT tokens in Dynamics 365 Finance. Feel free to experiment with the code snippet provided and explore the endless possibilities that JWT tokens offer in securing and enhancing your D365 Finance solution. Happy coding!

Stay tuned for more exciting content on Dynamics 365 Finance and integration techniques. If you have any questions or thoughts to share, please leave a comment below. Let's continue the conversation and empower each other in our journey towards successful D365 Finance integration using JWT tokens as DLL components.

1 comment:

  1. Hi Vishal,

    I have created a class library (.net standard 2.1) using below libraries and it generates the token in console application. But when i add this library in D365 it gives me below error. Can you please suggest what am I missing?

    Microsoft.Dynamics.Ax.Xpp.ClrErrorException: TypeLoadException ---> System.TypeLoadException: Could not load type 'System.IdentityModel.Tokens.Jwt.JwtSecurityToken' from assembly 'System.IdentityModel.Tokens.Jwt, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. at ClassLibrary3.GetToken.


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