If you copy and paste that JWT into the JWT.io Debugger, you can see the decoded versions of those three segments. These three segments are the header, payload, and signature. Here's an example of a JWT: 7Bc1C0CCDA1060E2GGlTfamrd8-W0ghBEĮach JWT is made up of three segments, each separated by a dot (. What are JWTs?Īt their core, JWTs are just bits of encoded JSON data with a cryptographic signature at the end. When the server receives it, it generates a signature using using some data from your JWT, verifies it, and if your JWT is valid, it sends back a response. You send your JWT to the server with each request. Once you're signed in, the site's server sends back a JWT that allows you access to things like your settings page, shopping cart, and so on. Encode or Decode JWTs Paste a JWT and decode its header, payload, and signature, or provide header, payload, and signature information to generate a JWT. When you sign in to a site with a username and password, or with a third party method like Google, you're proving who you are with those sensitive details or access. Here's a good overview of how token based authentication works: Source While they're an important part of the token based authentication process, JWTs themselves are used for authorization, not authentication. JWTs are usually used to manage user sessions on a website. In this article, we'll go over how JWTs are used, then dig into what JWTs are, and how they can securely transmit data through the signature and validation process. If you've ever signed in to a site like freeCodeCamp with your Google or GitHub account, there's a good chance that you're already using a JWT. A JSON Web Token, or JWT, is an open standard for securely creating and sending data between two parties, usually a client and a server.
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