Frontend Development
Debug client authorization, inspect permissions, and check Bearer token lifetimes.
Token
JWT Decoder & Encoder
A secure tool for JSON Web Token (JWT) inspection: real-time Decoder and Encoder.
All operations are processed locally in your browser with HMAC SHA-256 signature support.
JWT Anatomy
Every token consists of three dot-separated components.
Header
Contains token metadata: token type (JWT) and signing algorithm (HS256, RS256, etc.).
Payload
A set of claims about the subject, system timestamps (sub, iss, exp, iat), and custom data.
Signature
A cryptographic hash of header and payload ensuring data integrity and authenticity.
About the tool
Optimized for practical web development and security workflows.
Backend Development
Inspect outgoing service tokens, craft test JWTs, and verify HMAC signatures.
Security Auditing
Quickly verify token algorithms and detect insecure claims or misconfigurations.