Decode and inspect JWT tokens
Decode JSON Web Tokens and view their contents
Paste a JWT token above to decode it
How to Decode JWT Tokens
Decode and inspect JSON Web Tokens without verification. View header, payload, and expiration time. Perfect for debugging authentication flows.
Paste Your JWT
Copy a JWT from your application, browser dev tools, or API response and paste it in the input field.
View Decoded Data
Instantly see the decoded header and payload. Check claims like issuer, expiration, and custom data.
Verify Expiration
See if the token is expired, when it expires, and how long until expiration in human-readable format.
Why Use DevSensei?
What makes DevSensei different from other tools
Instant Decoding
JWT is decoded client-side as you paste. No server round-trip needed.
Expiration Check
Automatically checks if token is expired and shows time remaining in human-readable format.
Claim Inspection
View all standard claims (iss, sub, exp, iat) and custom claims in a formatted view.
Frequently Asked Questions
Common questions about this tool
Yes! DevSensei decodes JWTs entirely in your browser. The token never leaves your device. However, avoid sharing decoded contents containing sensitive information.
Signature verification requires the secret key, which should never be exposed in a browser. This tool is for inspection and debugging only. Always verify signatures server-side in production.