What is JSON Web Token (JWT)?

The Best Full Stack MERN Training Institute in Hyderabad with Live Internship Program

If you're looking to build a successful career in web development, Quality Thought is the top destination in Hyderabad for Full Stack MERN (MongoDB, Express.js, React, Node.js) training. Known for its industry-oriented curriculum and expert trainers, Quality Thought equips students with the skills needed to become job-ready full stack developers.

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A JSON Web Token (JWT) is a compact, URL-safe token used for securely transmitting information between parties as a JSON object. It is widely used for authentication and authorization in web apps.

Structure: JWT has three parts separated by dots (.):

  1. Header → contains token type (JWT) and signing algorithm (e.g., HS256).

  2. Payload → contains claims (user data, roles, expiration).

  3. Signature → ensures the token hasn’t been tampered with, generated using a secret key.

How it works:

  1. User logs in → server verifies credentials.

  2. Server creates a JWT with user info, signs it, and sends it to the client.

  3. Client stores JWT (e.g., in localStorage) and sends it in the Authorization header for future requests.

  4. Server validates the signature before granting access.

Benefits: Stateless, portable, and works well with REST APIs.
Note: Always use HTTPS to prevent token interception.

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