There are also some scenarios in which one token is wrapped inside another token, and these might require you to unwrap the token for subsequent calls to a different endpoint. For troubleshooting, debugging, and learning purposes cracking it open to see what’s going on is valid. A server however might, (as in most likely will), need to inspect the contents as part of the validation process. The client should use the token as is, and not make assumptions about the contents. Your client should not rely on the information in the token. If one has the need to decode the tokens without third-party tools there are standard libraries available from Microsoft that will enable you to do this. The signature however is a hash of the header & payload + a secret, and will end up as unreadable characters in Fiddler.Īlternatively you can roll your own implementation. The token is a concatenation of Base64-encoded strings, so by splitting it into separate strings you can do a plain Base64 decode. If you use Fiddler to capture traffic there's also the "TextWizard" utility that is able to transform JWTs to mostly readable text. (Note that the token shouldn't contain passwords and similar secrets, but there might still be data better left on your local device.) This works as intended, but you might not want to share all token details with a third-party. You can use an online tool to decode them: There are a couple of different options available if one wants to take a look at the contents of the token. The token itself is not intended to be readable by humans and needs to be decoded first. JWT and OAuth are more specific OAuth is the protocol, JWT is the token.)ĭebugging token acquisitions can be a real hassle when you get errors thrown at you - either from refusing to grant you a token, or denying you access to what you want when you have a token. (SAML refers to both the tokens and the protocol naming wise, which can be confusing. The details of these flows are not necessary for understanding the JWT, but the short version of it is that different login methods will need to do different things back-end for the security to be implemented correctly.įor those familiar with earlier identity related protocols this is comparable to SAML, with a difference being that SAML tokens are XML-based. For JWTs the tokens are the result of an OAuth flow (this includes OpenID Connect). Whether you have a mobile app hitting an API, or you sign in through a web page, the login process will have you ending up with a token with information about who you are and/or what you can access. These "keys" come in a format called JSON Web Tokens, or JWTs for short. These tokens are the "keys to your kingdom" in the Azure Active Directory world. If you run your Azure AD traffic through Fiddler or a similar proxy you will notice that the authentication header for most of your requests will contain something called a "Bearer" token which is a long and, on the surface, unreadable string. This guide consists of a Windows Forms app for decoding JSON Web Tokens (JWTs).
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