NodeJS Serial with Arduino

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I am trying to read data from Arduino via NodeJS.I am getting these errors:

**/home/cihangir/Documents/Workspaces/Node JS/Arduino_RFID/index.js:10
    parser: serialport.parsers.readline("\r\n")
                              ^

TypeError: Cannot read property 'readline' of undefined
    at Object.<anonymous> (/home/cihangir/Documents/Workspaces/Node JS/Arduino_RFID/index.js:10:31)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)
    at Module.runMain (module.js:605:10)
    at run (bootstrap_node.js:420:7)
    at startup (bootstrap_node.js:139:9)
    at bootstrap_node.js:535:3
**

var serialport =`require('serialport')` ;
var portName = '/dev/ttyUSB0';
var sp = new serialport.SerialPort(portName, {
    baudRate: 9600,
    dataBits: 8,
    parity: 'none',
    stopBits: 1,
    flowControl: false,
    parser: serialport.parsers.readline("\r\n")
});

sp.on('data', function(input) {
    console.log(input);
});

asked 42 secs ago

john

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NodeJS Serial with Arduino