如何显示所有console.log从node.js在heroku？

我已经将node.js应用程序部署到node.js,但无法从我的应用程序中看到完整的console.log语句.我在用：

heroku logs

显示一些日志记录,但看起来不像完整的日志.有没有一个node.js包从部署的应用程序发送电子邮件？电子邮件从我的本地电脑工作正常.

电子邮件代码：

console.log('try to send email hold on');
    var nodemailer = require("nodemailer");
    var smtpTransport = nodemailer.createTransport({
        @R_607_9260@ce: "Gmail",auth: {
            user: "myemail@gmail.com",pass: "mypw"
        }
    });

    smtpTransport.sendMail({
        from: "Dikkebil",// sender address
        to: "myemail@gmail.com",// comma separated list of receivers
        subject: "Error body",// Subject line
        text: 'Error body: ' +error.body+ '\n'+ 'error type:' + error.type +'\n' +'error statuscode:' +error.statusCode +'\n'  + 'error args:' + error.arguments[0]
    },function(error,responsE){
        if(error){
            console.log(error);
        }else{
            console.log("message sent: " + response.messagE);
        }
    });

$heroku logs -n 200