Your Security Tools Hub
Professional JWT decoding, signature verification, and claim validation tool
Enter a JWT to analyze claims and security
Enter a JWT to get security analysis
We'll analyze your token for common security issues
No recent tokens
| Algorithm | Type | Key Size | Security |
|---|---|---|---|
| HS256 | HMAC | 256-bit | Strong |
| RS256 | RSA | 2048-bit | Strong |
| ES256 | ECDSA | 256-bit | Strong |
None Algorithm
Tokens signed with "none" algorithm have no signature verification
Expired Tokens
Tokens with passed expiration time should be rejected
Decodes JWT parts from Base64URL format without external libraries
Verifies token signatures using Web Crypto API for client-side security
Validates exp, nbf, iat claims against current time and checks issuer
Analyzes tokens for common vulnerabilities and security misconfigurations
A JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed.
A JWT consists of three parts separated by dots (.):
Once user is logged in, each subsequent request includes the JWT, allowing the user to access routes, services, and resources permitted with that token.
JWTs are a good way of securely transmitting information between parties because they can be signed using public/private key pairs.