Paste a JSON Web Token and see its decoded header, payload claims, issued-at time, and expiration. Decoding runs locally — nothing leaves your browser.
JWT Decoder is a browser-based tool on 24Toolkit. Paste a JSON Web Token and see its decoded header, payload claims, issued-at time, and expiration. Decoding runs locally — nothing leaves your browser. Our JWT Decoder decodes JSON Web Tokens (JWTs) to view their header, payload, and signature. JWTs are used for authentication and authorization in APIs and web apps. Paste a JWT to inspect its contents—claims, expiration, and issuer. Decoding runs entirely in your browser. This tool does NOT validate signatures. Never paste sensitive production tokens into any online tool. For debugging and learning only. JWT Decoder is a browser-based workflow on 24Toolkit at /jwt-decoder for users who need fast, private results without installing software. Paste a JSON Web Token and see its decoded header, payload claims, issued-at time, and expiration. Decoding runs locally — nothing leaves your browser. The page is designed for direct use in modern browsers with clear steps, practical output, and shareable results. Primary focus areas include speed, privacy, and usability. Use it
Key Features
Decode JWT tokens
View header, payload, signature
Timestamps (exp, iat, nbf)
100% client-side
No registration
How to Use
Copy your JWT token (three parts separated by dots).
Paste it into the input area.
Click 'Decode JWT' to view header, payload, and signature.
Use Copy to extract any part. Check timestamps for exp, iat, nbf.
FAQ
Does this tool validate the JWT signature?
No. This tool only decodes (base64url) the JWT. It does not verify the signature. Never paste sensitive tokens—use only for debugging or learning.
Does my JWT leave the browser when I decode it?
No. JWT decoding splits the token string and Base64-decodes each segment using browser-native atob(). No network request is made, so tokens containing user claims or session data stay private.
What are exp, iat, and nbf?
exp = expiration time, iat = issued at, nbf = not before. These are standard JWT claims for token validity.