getToken();

function getToken()
{

var options = {
    url: 'https://demo.docusign.net/restapi/v2/oauth2/token',
    method: 'POST',
    headers: {
        "Accept": "application/json",
        "Content-Type": "application/x-www-form-urlencoded",
        "Content-Length": 152,
        "grant_type=password&client_id=integrationid&username=email&password=password&scope=api"
    }
};

// Send a http request to url and specify a callback that will be called upon its return.
request(options, function (error, response, body)
{
    var obj = JSON.parse(body);
    console.log( obj );
    for( var i = 0; i < obj.length; i++ )
    {
        var name = obj[i].name;
        console.log( name );
    }
});

POST https://{server}/restapi/{apiVersion}/oauth2/token
Accept: application/json
Content-Type: application/x-www-form-urlencoded
grant_type=password&client_id={IntegratorKey}&username={email}&password={password}&scope=api