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Implement JWT Decoding in C# for Authentication Purposes

by Anamta bnn
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Security is among the top concerns for any software development project. Revenue in the app security market can even reach $6.97 billion in 2024. It is expected to hit $11.83 billion by 2028.

C# JWT is dominating this game as it provides an efficient and standardized solution to manage user authentication and authorization. Today, we will discuss the benefits of implementing this practice. Then, you can learn the process of encoding and decoding JWTs using C#. Let’s jump into the details!

Importance Of Securing Applications Through Authentication And Authorization

Less than 10% of businesses are confident to deal with cybersecurity issues. Meanwhile, experts in the field state that every app suffers from at least four errors.

Fortunately, as technology evolves, there are many solutions to that problem. You can implement authentication and authorization by using JWT Token C# to secure your applications. They offer tons of benefits, such as:

  • Reduced risks: Authorization in C# JWT ensures only authorized users can access the functionalities and resources they need. Thus, there will be fewer risks of attacks and data breaches.
  • Regulatory compliance: Those two JWT C# security practices guarantee that any access to your sensitive data must comply with regulations. This way, you can build an extra protection layer for your app.

Understanding Authentication and Authorization

Authentication and authorization are crucial data security processes. Administrators use them to safeguard their systems from unauthorized access. These terms sound similar, but they play different roles.

What is Authentication?

Authentication verifies the identity of users before giving them access to the apps. For example, when you try to reach a website, you must enter your account, username, and password. You can continue using the website if the data you submit matches the system’s database.

There are many types of authentication for apps, such as:

  • Email and password: Password-based login is the most popular method. Users input their email and password when using an app. They also need the information every time they return to the app.
  • SMS authentication: Users input a one-time code when they access the app. The code is sent via SMS.
  • Third-party authentication: Like the SMS technique, users receive a code to gain access to the app, but this code comes from a mobile app.
  • Biometric authentication: This technique uses fingerprint, facial, or voice recognition to verify users’ identities.

What is Authorization?

Authorization determines the resources and actions that users can access. This process takes place after the authentication. It often involves control policies and user permission.

Authorization processes come in different forms. The most popular ones are:

  • Access Control Lists (ACLs): These systems deny or allow rules after considering users’ authorization level.
  • Data access: You can group your database based on their sensitivity levels. So, you can give different types of access to specific users. For example, employees can only use internal data, and managers can access confidential data.

Authentication vs. Authorization

So, authentication in C# JWT is about verifying credentials through ID tokens. On the other hand, authorization JWT Token C# focuses on granting and denying permissions through access tokens. Besides, authentication is visible to users, while authorization isn’t.

How To Use JSON Web Tokens (JWTs) in Modern Web Applications?

JSON Web Token (JWT) is a standard way to secure data transmitted between parties. It contains claims encoded in the specific JSON format. The claims then allow the sharing of data.

There are many benefits to using JWT Token. For example, you create it on your server and deliver it to clients. Then, clients submit it with requests. This way, you can save a lot of database space. Moreover, this method doesn’t demand a data lookup, making it quicker to verify the JWT.

A JWT Token C# typically has three components: Header, payload, and signature. Here is how to use it for authorization and authentication in modern web apps:

Header and Payload

The header mentions the token type (JWT) and its signing algorithm. After creating the header, you will work with the payload containing claims. Those claims are shown as a JSON string. The server uses it to check that users can perform the actions they request.


The signature guarantees that no one can change the token. Once you create the JTW, you sign its payload and header in a way that only the receiver and issuer know. Sometimes, it is known solely to the sender. So, if someone uses the token, the receiver confirms that the payload and header fit the signature.

JWTs are popular for authentication in modern web applications. Generally, the server verifies its signature and ensures that its payload can be trusted. You can also use JWTs for app authorization, too. Users need them to prove their identities and visit necessary resources.

How To Decode JWTs in C# for Authentication and Authorization Purposes?

Many developers use JWTs in C# for authentication and authorization. The best thing is that C# offers many libraries to create and validate JWTs.

You can encode and decode JWTs in C# seamlessly. Here is how to do it:

JWT Encoding

First, choose a library for your project. Then, follow the steps below:

JWT Decoding

Decoding JWT is the opposite process. You need it to verify the integrity of your JWT. Moreover, the JWT contains claims about users, such as ID or permissions. So, you decode it to extract this information and authenticate it based on the claims.

The steps of decoding JWT are as follows: (Link to imageSource)

As you can see, this step is about validation. For example, when you validate an audience, you check their token to ensure it’s intended for your app.

Final Thoughts

C# JWT enhances authorization and authentication processes in your apps. It offers simplicity and security to streamline your workflows. Ultimately, you can improve the software’s performance.

So, ready to take your security strategies to the next level? Learn to decode JWTs in C# today and thrive in the digital world!