JSON Web Tokens (JWT) in .NET 8 Web API 🔒 - User Registration / Login / Authentication 

JSON Web Tokens (JWT) in .NET 8 Web API 🔒 - User Registration / Login / Authentication
In this tutorial, we will discuss about the implementation of JWT authentication in asp.net core 8.0 with example.
A JSON web token(JWT) is JSON Object which is used to securely transfer information over the web(between two parties). It can be used for an authentication system and can also be used for information exchange. The token is mainly composed of header, payload, signature. These three parts are separated by dots(.)
Header
A header in a JWT is mostly used to describe the cryptographic operations applied to the JWT like signing/decryption technique used on it. It can also contain the data about the media/content type of the information we are sending.
{
"typ":"JWT",
"alg":"HS256"
}
Payload
The payload is the part of the JWT where all the user data is actually added. This data is also referred to as the ‘claims’ of the JWT. This information is readable by anyone so it is always advised to not put any confidential information in here.
{
"userId":"b07f85be-45da",
"iss": "provider.domain.com/",
"sub": "auth/some-hash-here",
"exp": 153452683
}
Signature
This is the third part of JWT and used to verify the authenticity of token. BASE64URL encoded header and payload are joined together with dot(.) and it is then hashed using the hashing algorithm defined in a header with a secret key. T
JWT Example :
header:
{
"alg" : "HS256",
"typ" : "JWT"
}
Payload:
{
"id" : 123456789,
"name" : "Manoj"
}
Secret: manojdeshwal
JSON Web Token
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6MTIzNDU2Nzg5LCJuYW1lIjoiSm9zZXBoIn0.OpOSSw7e485LOP5PrzScxHb7SR6sAOMRckfFwi4rp7o
Tools Used: Visual Studio 2022, Swagger and Postman
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