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JSON Web Token is one of the best standards to implement an authentication system in your MERN stack app. In this article, we will just have look at authentication in the MERN stack app using JWT.

What is JSON Web Token?

JSON Web Token (JWT) is an open standard ( RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object

When should you use JSON Web Tokens?

Here are some scenarios where JSON Web Tokens are useful:

• Authorization: This is the most common scenario for using JWT. Once the user is logged in, each subsequent request will include the JWT, allowing the user to access routes, services, and resources that are permitted with that token. Single Sign-On is a feature that widely uses JWT nowadays, because of its small overhead and its ability to be easily used across different domains.
• Information Exchange: JSON Web Tokens are a good way of securely transmitting information betwWhat is the JSON Web Token structure?

In its compact form, JSON Web Tokens consist of three parts separated by dots (.), which are:

• Header
• Payload
• Signature

Therefore, a JWT typically looks like the following.

xxxxx.yyyyy.zzzzz

Because JWTs can be signed — for example, using public/private key pairs — you can be sure the senders are who they say they are. Additionally, as the signature is calculated using the header and the payload, you can also verify that the content hasn’t been tampered with.

#react #nodejs #authentication #jwt