Creating JWT custom claims in DataPower - jwt

Question

Running on DataPower 7.5.2.0
I created a JWT Generator as part of a AAA Policy and it is working fine, I am able to generate, sign and then externally verify the JWT with no issues.
Now I want to add a custom claim to the JWT, so I ticked the box for Custom and then uploaded this Gateway script file:
var claim = {
"result" : {
"user" : "hardcode"
}
};
session.output.write(claim);
and it generates the correct JWT with the user attribute. However when I try to add a second value to it like so:
var claim = {
"result" : {
"user" : "hardcode",
"name" : "myname"
}
};
session.output.write(claim);
I now get this error:
[Error: Required CustomClaim Name or Value field missing] errorMessage: 'Required CustomClaim Name or Value field missing', errorCode: '0x8580005c', errorDescription: 'GatewayScript console log message.', errorSuggestion: 'GatewayScript console log message. Refer to the message for more information.'
Which is the same message I got before I realized I had to set the output to result from the InfoCenter's vague documentation.
How do I add multiple custom claims in the JWT Generator Gateway script??

Answer 1

It would appear that DataPower only allows you to add a single custom claim, so you just need to make that a complex object like so:
var claim = {
"result" : {
"claim" : {
"user" : "hardcode",
"one" : true,
"clientId" : "asdf-asdf-asdf",
"endpoint" : "http://192.168.142:8080/member/ws"
}
}
};
session.output.write(claim);
This then generates the correct JWT with a nest claim.
eyJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJhcGljIiwic3ViIjoiYWRtaW4iLCJleHAiOjE0ODIyNjU5ODQsImlhdCI6MTQ4MjI2MjM4NCwianRpIjoiZDhjNTE1ZDEtZmVjMS00ZGVmLThiNDctZmYzY2E2OWVjOWRiIiwibm9uY2UiOiJtN2lVZlBqTCIsImF1ZCI6ImlkMSIsImNsYWltIjp7InVzZXIiOiJmcmVkIiwib25lIjp0cnVlLCJjbGllbnRJZCI6ImFzZGYtYXNkZi1hc2RmIiwiZW5kcG9pbnQiOiJodHRwOi8vMTkyLjE2OC4xNDI6ODA4MC9tZW1iZXIvd3MifX0.viakwnM5bhhmGIn0QmDJTmsWCuIciO2BOdUVyxYpsFA