React

I’ve built 40+ JWT decode tools for development teams. Most developers think it’s just base64 decoding, but I’ve seen production outages from tools that don’t validate signatures, handle malformed tokens, or protect against SSRF attacks. Here’s how to build a secure, production-ready JWT decoder. Visual Overview: graph LR subgraph JWT Token A[Header] --> B[Payload] --> C[Signature] end A --> D["{ alg: RS256, typ: JWT }"] B --> E["{ sub, iss, exp, iat, ... }"] C --> F["HMACSHA256(base64(header) + base64(payload), secret)"] style A fill:#667eea,color:#fff style B fill:#764ba2,color:#fff style C fill:#f093fb,color:#fff Why This Matters According to the 2024 JWT Security Report, 68% of developers use online JWT decoders during development, but 23% of these tools have security vulnerabilities including: ...

JSON Web Tokens (JWT) have become a cornerstone of modern web applications, especially in React projects where state management and authentication are critical. The jwt-decode library is a popular choice for decoding JWT tokens in client-side applications. However, using this library requires careful consideration to ensure security and prevent vulnerabilities. In this article, we’ll explore best practices for safely using jwt-decode in React projects, including proper validation, secure storage, and alternatives for sensitive operations. ...

JSON Web Tokens (JWTs) have become a cornerstone in modern web development, especially for authentication and authorization. As a developer, you may often need to decode these tokens to access their payload data without verifying their signature. The jwt-decode npm package simplifies this process, making it straightforward to work with JWTs in JavaScript applications. In this article, we’ll walk through how to use the jwt-decode package to decode JWT tokens. We’ll cover the basics of JWT structure, the installation process, practical implementation examples, and important considerations for working with JWTs securely. ...