JWT Decoder
Open a token and inspect its claims and metadata to check expiry and scope. This helps when debugging authentication flows or validating tokens during development.
JWT Decoder
Paste any JSON Web Token to decode and inspect its header, payload, and signature. Expiry detection, claim explanations, and raw Base64URL sections: all local.
Paste JWT Token
Paste a JWT above to decode it
Or to see how it works
Full Token Inspection
Decode and display the header, payload, and signature sections of any JWT with syntax-highlighted JSON output.
Expiry & Claim Analysis
Instantly see whether a token is valid, expired, or has no expiry, with a human-readable remaining time.
100% Private & Local
Tokens are decoded entirely in your browser using JavaScript. Nothing is ever sent to a server or logged.
How to Decode a JWT
Paste Your Token
Copy a JWT from your browser's dev tools, an API response, or a log file and paste it into the input area.
Inspect Header & Payload
The tool splits the token into its three parts and renders the header and payload as formatted, syntax-highlighted JSON.
Check Expiry & Claims
Well-known registered claims (exp, iat, sub, iss, etc.) are explained inline, with timestamps converted to human-readable dates.
Copy Any Section
Copy the full token, just the header JSON, the payload JSON, or the raw signature with one click.
Who Uses a JWT Decoder?
Backend Developers
Inspect tokens from authentication flows during local development to verify claims, audiences, and expiry windows.
Frontend Developers
Check the contents of access tokens stored in localStorage or cookies to debug authorization issues.
Security Researchers
Examine JWT structure, algorithm choice, and claim composition when auditing authentication implementations.
QA Engineers
Verify that issued tokens contain the correct claims, roles, and scopes before running automated test suites.
DevOps & SREs
Decode tokens from service-to-service calls in logs and traces to diagnose auth failures in production.
API Developers
Inspect OAuth 2.0 access tokens and OIDC ID tokens when integrating with third-party identity providers.
Endless Forge vs Other JWT Tools
Private, claim-aware, and fully local - no token ever leaves your browser.
Understand every token at a glance
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Frequently Asked Questions
6 questions answered