JWT Decoder
Decode and analyze JWT tokens
JWT Token
What is a JWT?
A JSON Web Token (JWT) is a compact, URL-safe format for transmitting information between two parties. JWTs are frequently used for authentication and authorization in web applications. A JWT consists of three parts: the header, which describes the algorithm and type, the payload containing the actual data (called claims), and the signature that ensures the token's integrity. The three parts are each Base64URL-encoded and separated by dots. JWTs have become the industry standard for stateless authentication in modern web applications.
How do I use the JWT Decoder?
Paste your JWT token into the input field. The tool automatically decodes the token and displays the header, payload, and signature in separate, expandable sections. The payload is shown as formatted JSON, so you can see all claims at a glance. If the token contains an expiration date (exp claim), it shows whether the token is still valid or has already expired. Use the copy button to copy the payload directly to your clipboard.
Why decode JWT online?
When developing and debugging APIs, it is often necessary to quickly inspect the contents of a JWT token. Our online decoder runs entirely in the browser, so your token is never sent to a server. This is especially important for tokens containing sensitive user information. Note, however, that this tool does not verify the signature. For token validation in production environments, you should always use a server-side library that correctly checks the signature algorithm.
More Tools
Also try our Base64 Encoder for raw token parts, the JSON Formatter for the payload, or the Timestamp Converter for exp/iat claims.