JWT Decoder
Decode JSON Web Tokens (JWT) to view header, payload, and signature. Instantly inspect JWTs for authentication and security.
Related Tools
FAQs
How to Use
The JWT Decoder tool, sometimes called a JWT inspector, JWT analyzer, or JSON Web Token decoder, lets you easily view the contents of a JWT. Simply paste your JWT token into the input box and click 'Decode Token' to instantly see the decoded header and payload. This tool is helpful for quickly inspecting the data inside a JWT without needing any extra software or command line steps. If the token is invalid or incorrectly formatted, you’ll see an error message to help you troubleshoot.
More About This Tool
The JWT Decoder tool is designed to help developers, security professionals, and anyone working with authentication systems to quickly and easily inspect the contents of a JSON Web Token. JWTs are widely used in modern web applications for securely transmitting information, especially for user authentication and authorization. Each JWT consists of three parts: a header, a payload, and a signature. The header and payload are Base64Url-encoded JSON objects, while the signature is used to verify the token’s integrity. By decoding the header and payload, you can view important information such as the algorithm used, token issuer, subject, expiration time, and custom claims. This tool does not verify the signature, so it should be used for inspection and debugging rather than security validation. Understanding the contents of a JWT is essential for troubleshooting authentication issues, verifying claims, and learning how secure token-based systems work. The JWT Decoder provides a fast, user-friendly way to analyze tokens and better understand the structure and data they contain.