Tutorial for JWT generation

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JSON Web Token(JWT) generation is very similar to JSON Web Signature(JWS) generation since those difference is just payload. JWS generation is to create header and payload JSON object with necessary claims and then sign it.

Time in JWS/JWT, integer value for UNIX origin time since 1970 Jan 1 will be used. To specify time value KJUR.jws.IntData.get method is very useful.

Here is a sample for a JWT generation with HS256 signature algorithm:

// Header
var oHeader = {alg: 'HS256', typ: 'JWT'};
// Payload
var oPayload = {};
var tNow = KJUR.jws.IntDate.get('now');
var tEnd = KJUR.jws.IntDate.get('now + 1day');
oPayload.iss = "http://foo.com";
oPayload.sub = "mailto:[email protected]";
oPayload.nbf = tNow;
oPayload.iat = tNow;
oPayload.exp = tEnd;
oPayload.jti = "id123456";
oPayload.aud = "http://foo.com/employee";
// Sign JWT, password=616161
var sHeader = JSON.stringify(oHeader);
var sPayload = JSON.stringify(oPayload);
var sJWT = KJUR.jws.JWS.sign("HS256", sHeader, sPayload, "616161");

When you want to sign JWT by your private key, KEYUTIL.getKey method can be used to load PKCS#1 or PKCS#8 PEM formatted encrypted or plain private key. Here is an example:

var prvKey = KEYUTIL.getKey(sPKCS8PEM, "password");
var sJWT = KJUR.jws.JWS.sign("RS256", sHeader, sPayload, prvKey);

Please also see Online JWT generation/verification tool.