JWT Inspector
Decode JSON Web Tokens instantly. Verify algorithms, claims, and expiration securely in your browser.
Decode JSON Web Tokens instantly. Verify algorithms, claims, and expiration securely in your browser.
Layerbit’s JWT Inspector is engineered specifically for security-conscious developers. We utilize native client-side cryptography and base64url parsing, ensuring your sensitive authentication strings never leave your local machine.
Instantly decode tokens generated by identity providers like Auth0, AWS Cognito, or Keycloak to verify scopes, permissions, and user identifiers (sub) during integration.
Quickly calculate precisely when a session expires by inspecting the exp (Expiration Time) and iat (Issued At) claims, essential for troubleshooting premature logouts.
Safely inspect suspicious or malformed tokens found in application logs without risking server-side Base64 decoding vulnerabilities or accidentally executing malicious logic.
Test the decoding and validation logic instantly. Click the templates below to load sample JWT payloads directly into the workspace.
JWTs often contain sensitive user data (PII) or critical authorization scopes. Sending these tokens to a remote server for decoding introduces a significant security risk. By performing all Base64URL decoding and JSON parsing within your browser DOM, we guarantee that your tokens are never logged, stored, or intercepted.
No. Signature verification requires access to the public key (for asymmetric algorithms like RS256) or the shared secret (for symmetric algorithms like HS256). Since this tool operates in a zero-knowledge, client-side environment, we only decode and display the data. We do *check* the expiration claim as a utility, but this is not a substitute for proper backend cryptographic verification.
JWTs are stateless and self-contained. Traditional cookies require the backend to perform a database lookup for every request to verify session data. JWTs store the session data directly in the payload, which is cryptographically signed. This allows API gateways and microservices to verify authorization instantly without hitting a central session database, significantly improving scalability.
exp claim verification matrix and conditional status badge rendering.