Unable to verify leaf signature

Note: the following is dangerous, and will allow API content to be intercepted and modified between the client and the server.

This also worked

process.env['NODE_TLS_REJECT_UNAUTHORIZED'] = '0';

It's not an issue with the application, but with the certificate which is signed by an intermediary CA. If you accept that fact and still want to proceed, add the following to request options:

rejectUnauthorized: false

Full request:

request({
    "rejectUnauthorized": false,
    "url": domain+"/api/orders/originator/"+id,
    "method": "GET",
    "headers":{
        "X-API-VERSION": 1,
        "X-API-KEY": key
    },
}, function(err, response, body){
    console.log(err);
    console.log(response);
    console.log(body);
});