What is JWT and how is it used in MERN stack?

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In a MERN (MongoDB, Express.js, React, Node.js) app, authentication verifies a user’s identity before granting access to resources. It’s commonly implemented using JWT (JSON Web Tokens) or sessions.

JWT (JSON Web Token) is a compact, URL-safe token used for securely transmitting information between parties as a JSON object. It is digitally signed (using HMAC or RSA) to ensure integrity and authenticity.

In the MERN stack (MongoDB, Express.js, React, Node.js), JWT is commonly used for authentication:

Structure:

1. Header – Contains token type (JWT) and signing algorithm.

2. Payload – Holds claims like user ID, roles, and expiration time.

3. Signature – Ensures the token hasn’t been altered.

How it’s used:

1. Login – User sends credentials to the backend (Express + Node.js).

2. Token Generation – On success, server creates a JWT signed with a secret key.

3. Storage – Token is sent to the client, stored in HTTP-only cookies or localStorage.

4. Request Authorization – Client sends the token in Authorization header for protected routes.

5. Verification – Server verifies the signature and payload before granting access.

Benefits:

• Stateless authentication (no server-side session storage).

• Works well with APIs and microservices.

In short, JWT in MERN enables secure, scalable, and stateless user authentication.

Read More :

How do you implement authentication in a MERN app?

What is CORS and how do you handle it?

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