How to run mongodump command in spawn/exec child process with arguments

I need to run mongodump command with below arguments

    var dbhost = mongoose.connection.host || "127.0.0.1",
                    dbport = mongoose.connection.port,
                    dbname = mongoose.connection.name,
                    dbuser = mongoose.connection.options.user,
                    dbpass = mongoose.connection.options.pass,
                    backupPath = path,
                    date = new Date(),
                    currentDate =  date.toLocaleString(),
                    backupFileName ='DBBACKUP-'+currentDate;

how to pass above variables to child process

var backupDB = spawn('mongodump --host dbhost --port dbport --username dbuser --password dbpass --db dbname --archive=backupPath/backupFileName.gz --gzip');
                backupDB.stdout.on('data',function(data){
                    console.log('stdout: ' + data);// 
                });

via Srinivas