JWT Decoder & Validator - Online JWT Tool
Decode and validate JWT tokens (JSON Web Tokens) with optional signature verification. View header, payload, and signature details with expiration status. Perfect for debugging authentication tokens.
JWT Token
Header
Payload
Signature Verification
Security Notice: Only use this feature for development/testing. Never enter production secrets.
About JWT Decoder
A powerful tool for decoding and validating JSON Web Tokens (JWTs). View token structure, expiration status, and verify signatures.
Features:
- Decode JWT header and payload
- Display token information (algorithm, expiration, etc.)
- Optional signature verification with secret key
- Expiration status indicator
- Copy header or payload JSON
- Human-readable timestamps
Common JWT Claims:
sub- Subject (user ID)iat- Issued Atexp- Expiration Timeiss- Issueraud- Audience
JWTs are URL-safe encoded and consist of three parts: header.payload.signature