JWT Generator

Generate JWT tokens online with HS256/HS384/HS512 signing and standard claims, processed locally in the browser.

Header parameters

Signing algorithm

Type (typ)

Secret keyStandard claims

Issuer (iss)

Subject (sub)

Audience (aud)

JWT ID (jti)

Expiration (exp)

Not before (nbf)

Issued at (iat)

Custom data (JSON)

Generated JWT Token

What is a JWT?

A JWT (JSON Web Token) is an open standard (RFC 7519) for securely transmitting information between parties. It encodes claims as a JSON object and consists of three segments joined by dots (.), commonly used for API authentication and authorization.

JWT structure

Header/Contains the token type (typ) and signing algorithm (alg)
Payload/Contains claims such as user identity, permissions, and expiration time
Signature/Generated from the encoded Header and Payload with a secret key, used to verify the content is unmodified

Common Claims

iss/Issuer
sub/Subject
aud/Audience
exp/Expiration time
nbf/Not before
iat/Issued at
jti/Unique identifier (JWT ID)