app_JWT

var jwt = require('jsonwebtoken');

// Generate your own secret key for your app here https://app.supportkit.io
var KEY_ID = '55e9f9bf7a0ce5ca2d429c17';
var SECRET = 'BFJJ88naxc5PZNAMU9KpBNTR';

var signJwt = function() {
    return jwt.sign({
        scope: 'app'
    },
    SECRET,
    {
        header: {
            kid: KEY_ID
        }
    });
}

@alavers I think that it should be header instead of headers

ah, it seems they've changed it under our noses https://github.com/auth0/node-jsonwebtoken/blob/78bf0083df842e15cdaed5d0269da5b3215b3b41/CHANGELOG.md#600---2016-04-27