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September 18, 2023|
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Overview
In the realm of modern web development, security is paramount. The need to authenticate users, authorize access, and securely transmit data between parties has led to the widespread adoption of JSON Web Tokens (JWTs). JWTs have emerged as a versatile and effective solution for addressing these challenges. In this comprehensive overview, we will delve into the world of JWTs, exploring what they are, how they work, and their myriad applications in today’s digital landscape.
Introduction
JSON Web Tokens (JWTs) have become fundamental to modern web security and authentication.
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JWT
JWTs are represented as strings and consist of three parts:
- Header: The header consists of the token type and the signing algorithm, such as HMAC SHA256 or RSA. This JSON object is base64Url-encoded.
- Payload: The payload contains claims/data about the user. Claims can be of 3 types: registered, public, and private.
- Signature: The encoded header, encoded payload, a secret (for HMAC methods), a private key (for RSA), and the algorithm mentioned in the header are the ingredients needed to construct the signature portion. The JWT’s signature proves that the message was sent by who it purports to be and wasn’t altered in transit.
Therefore, a typical JWT looks like xxxx.yyyy.zzzz
JWT.io contains the official documentation, which has an introduction debugger that can decode, verify, and generate JWT and shows a live count of the number of JWT tokens created.
Why use JWT?
Using JWT provides several advantages in web development and has been a popular choice.
Some of the advantages of using JWT are:
- Security – JWT has a signature field that improves security, can be protected from spoofing, and has an optional encryption field. JWTs are a popular choice for Authentication and Authorization.
- Compactness – JWT are small due to their JSON format, making transmission efficient.
- Statelessness – JWT enables Statelessness, which is an efficient criterion for communication. All the data required is self-contained with the token itself. There is no additional tracking required in the server, which improves scalability.
- Compatibility – JWTs can be easily integrated into many programming languages and frameworks that can leverage the tokens’ features for communication.
What was used before JWT / Alternatives of JWT?
Some of the alternatives for using JWT are:
- Session Cookies
- Session management Libraries
- API keys
- SAML
When choosing an authentication and authorization approach, it’s essential to consider factors such as security requirements, scalability, compatibility with existing systems, and the specific use cases of your application. JWTs are popular due to their versatility and statelessness, but other methods may be more suitable in certain scenarios.
Generating and Decoding JWT using npm packages
- We will be using jsonwebtoken npm packages to generate and decode JWT tokens
- sign method to generate a token and jwt.verify for validation of the token
Encoding Data
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//Code Snippet const jwt = require('jsonwebtoken'); const secretKey = 'SECRET'; // Generally taken from environment variable const payload = { username: 'john.doe@email.com', password: 'qwerty@123' }; const token = jwt.sign(payload, secretKey, { expiresIn: '1h' }); console.log('Generated JWT token:', token); //OUTPUT: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VybmFtZSI6ImpvaG4uZG9lQGVtYWlsLmNvbSIsInBhc3N3b3JkIjoicXdlcnR5QDEyMyJ9.5dW2hYAyuUh3xbkF76vOONjBOQnhGyPunbp5bdOYbJQ |
Decoding Data
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//Code Snippet const jwt = require('jsonwebtoken'); const secretKey = 'SECRET'; // Generally taken from environment variable const tokenToDecode = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VybmFtZSI6ImpvaG4uZG9lQGVtYWlsLmNvbSIsInBhc3N3b3JkIjoicXdlcnR5QDEyMyJ9.5dW2hYAyuUh3xbkF76vOONjBOQnhGyPunbp5bdOYbJQ '; try { const decoded = jwt.verify(tokenToDecode, secretKey); console.log('Decoded JWT payload:', decoded); } catch (error) { console.error('JWT verification failed:', error.message); } //OUTPUT: {username: "john.doe@email.com", password: "qwerty@123", iat: 1694418275, exp: 1694421875} |
Live Demo: CT_JWT_Demo – CodeSandbox
JWT Uses in AWS
- Amazon API Gateway: RESTful APIs can be protected with JWTs by utilizing Amazon API Gateway. Before granting access to API endpoints, API Gateway may validate JWT tokens, guaranteeing that only authenticated and permitted users or apps can submit requests.
- Amazon S3 Object access: You can use JWTs to control access to objects in Amazon S3.
- Amazon Cognito** – ** Amazon Cognito is AWS’s fully managed identity service. It supports JWTs as a standard token format for authentication and authorization.
Conclusion
JSON Web Tokens (JWTs) have become a fundamental building block of modern web application security. Their simplicity, versatility, and efficiency make them a valuable tool for authentication, authorization, and secure data exchange in a wide range of applications and use cases. Understanding how to use JWTs securely is crucial for building robust and reliable systems.Â
Drop a query if you have any questions regarding JWT Token and we will get back to you quickly.
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FAQs
1. How is a JWT different from a session token or a cookie?
ANS: – JWTs are self-contained tokens that do not require server-side storage. In contrast, session tokens and cookies typically require server-side state management. JWTs are often preferred in stateless and distributed architectures.
2. How do I secure a JWT?
ANS: – JWTs can be secured by signing (and optionally encrypting) using a secret or private key. Proper key management, token validation, and implementing security best practices are essential to JWT security.
3. Can a JWT be revoked?
ANS: – JWTs do not have built-in revocation mechanisms. Once issued, a JWT is considered valid until it expires. To handle revocation, you may need to implement additional mechanisms, like token blacklisting.
WRITTEN BY Jaya Srikar Kotha
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