![]() ![]() In this handler, we have searched for a user that matches the username and the password in the request body. Res.send( 'Username or password incorrect') If you decoded the header it would look something similar to this:, accessTokenSecret) The first section of the JWT is the header, which is a Base64-encoded string. ![]() You can read any Base64 encoded text by simply decoding them. Sidebar: Base64 encoding is one way of making sure the data is uncorrupted as it does not compress or encrypt data, but simply encodes it in a way that most systems can understand. We will get into that in more detail later in this article.Īs you can see in the image, there are three sections of this JWT, each separated with a dot. So instead of just sending back a plain JSON token, the server will send a signed token, which can verify that the information is unchanged. This is where the signing of the token comes in. The problem is, there is no way to validate such a request. So since the JSON object is readable, anyone can edit that information and send a request. Anyone can send a fake request with a fake JSON token and pretend to be someone they are not.įor example, let's say that after authentication, the server sends back a JSON object with the username and the expiration time back to the client. But there is a problem with that approach. So the server won't have to store any information about the session. The client will send this token along with all the requests following that. On the other hand with JWT, when the client sends an authentication request to the server, it will send a JSON token back to the client, which includes all the information about the user with the response. Here's is the diagram of how session-based authentication works: The server can then fetch information about the client using this reference. ![]() The client will send each request with this sessions ID. The server will store this session ID in memory or in a database. There are a few ways of doing this, however, the most popular way is to set a session ID, which is a reference to the user information. They should include the information about previous requests that the user made in the request itself. The server does not know about any previous requests that were sent by the same client. HTTP is a stateless protocol, which means that an HTTP request does not maintain state. It was introduced with the RFC 7519 specification by the Internet Engineering Task Force (IETF).Įven though we can use JWT with any type of communication method, today JWT is very popular for handling authentication and authorization via HTTP.įirst, you'll need to know a few characteristics of HTTP. JSON Web Tokens (JWT) have been introduced as a method of communicating between two parties securely. You do not have to have any previous experience with JSON Web Tokens since we will be talking about it from scratch.įor the implementation section, it would be preferred if you have the previous experience with Express, Javascript ES6, and REST Clients. Say you're using this route (which is passed an e-mail address and a password):Īpp.post('/login', passport.In this article, we will be talking about how JSON Web Tokens works, what are the advantages of them, their structure, and how to use them to handle basic authentication and authorization in Express. ![]() The strategy-implementation works in conjunction with thenticate to both authenticate a request, and handle success/failure. ![]()
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