📌 JSON Web Tokens (JWT) Summary
JSON Web Tokens (JWT) are a compact and self-contained way to transmit information securely between parties as a JSON object. They are commonly used for authentication and authorisation in web applications, allowing servers to verify the identity of users and ensure they have permission to access certain resources. The information inside a JWT is digitally signed, so it cannot be tampered with without detection, and can be verified by the receiving party.
🙋🏻♂️ Explain JSON Web Tokens (JWT) Simply
Imagine a JWT as a digital version of a stamped ticket you get at a cinema. The ticket shows your seat and the film you are allowed to watch, and the stamp proves it is real. With JWT, your ticket contains information about you and what you can do, and the digital signature acts as the stamp that proves it has not been changed.
📅 How Can it be used?
JWT can be used to let users log in once and access different sections of a website without re-entering their password.
🗺️ Real World Examples
A mobile banking app uses JWTs to keep users logged in securely. When a user logs in, the server sends a JWT to the app, which then includes this token in each request it makes. The server checks the token to confirm the user’s identity and permissions before allowing access to account information or transactions.
An online learning platform uses JWTs to grant teachers and students access to different features. After signing in, users receive a token that specifies their role. When accessing course content or submitting assignments, the platform checks the JWT to decide whether the user can view materials or grade submissions.
✅ FAQ
What is a JSON Web Token and why is it useful?
A JSON Web Token, or JWT, is a small digital package that carries information between two parties, such as a user and a website. It is useful because it helps websites confirm who you are without needing to check a password every time you do something. This makes logging in and staying logged in much simpler and safer for both users and websites.
How does a JWT help keep my information secure?
A JWT is signed using a special key, which means that if anyone tries to change what is inside, it will be obvious to the website or service checking it. This helps prevent tampering and makes sure that only trusted information is accepted, keeping your details and permissions safe as you use different parts of an application.
Can anyone read the information inside a JWT?
The information inside a JWT is not hidden, but it is protected from being changed. While someone could see what is inside if they have the token, they cannot alter it without being detected. For this reason, sensitive data like passwords should not be included in a JWT, and it is best used for things like user IDs or access permissions.
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