(You can use a JSON formatter tool to prettify the JSON object.) The header contains the metadata for the token and it minimally contains the type of signature and the encryption algorithm. YRQYnWzskCZUxPwaQupWkiUzKELZ49eM7oWxAQK_ZXw Header Here is a JWT token example: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.ĮyJpc3MiOiJ0b3B0YWwuY29tIiwiZXhwIjoxNDI2NDIwODAwLCJodHRwOi8vdG9wdGFsLmNvbS9qd3RfY2xhaW1zL2lzX2FkbWluIjp0cnVlLCJjb21wYW55IjoiVG9wdGFsIiwiYXdlc29tZSI6dHJ1ZX0. Structure of a JSON Web TokenĪ JWT is represented as a sequence of base64url encoded values that are separated by period characters. It comprises a compact and URL-safe JSON object, which is cryptographically signed to verify its authenticity, and which can also be encrypted if the payload contains sensitive information.īecause of its compact structure, JWT is usually used in HTTP Authorization headers or URL query parameters. The best known solutions to authentication problems for APIs are the OAuth 2.0 and the JSON Web Token (JWT).īefore we get into this JSON Web Token tutorial, what exactly is a JWT? What is a JSON Web Token?Ī JSON Web Token is used to send information that can be verified and trusted by means of a digital signature. However, handling authentication in modern Mobile and Single Page Applications can be tricky, and demand a better approach. For decades, cookies and server-based authentication were the easiest solution. These changes have led to new ways of implementing authentication in modern applications.Īuthentication is one of the most important parts of any web application. Our back-end is more about business logic and data, while presentation logic is moved exclusively to the front-end or mobile applications. With technologies like AngularJS and BackboneJS, we are no longer spending much time building markup, instead we are building APIs that our front-end applications consume. With the rising popularity of single page applications, mobile applications, and RESTful API services, the way web developers write back-end code has changed significantly.
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