npm install detectlanguage [--save]

var DetectLanguage = require('detectlanguage');
var detectLanguage = new DetectLanguage({
    key: '[INSERT YOUR KEY HERE]',
    ssl: true|false (defaults to TRUE)
});    

var dataSimple = "I am a Teapot and a Submarine";
detectLanguage.detect(dataSimple, function(error, result) {
    console.log(JSON.stringify(result));
});

{
  data: {
    detections: [
      {
        language: "en",
        isReliable: true,
        confidence: 7.85
      }
    ]
  }
}

var dataBulk = [
    "I am a Teapot and a Submarine",
    "Soy una tetera y un submarino",
    "Jeg er en tekande og en ubåd"
]
detectLanguage.detect(dataBulk, function(error, result) {
    console.log(JSON.stringify(result));
});

{
  data: {
    detections: [
      [
        {
          language: "en",
          isReliable: true,
          confidence: 7.85
        }
      ],
      [
        {
          language: "es",
          isReliable: true,
          confidence: 3.75
        }
      ],
      [
        {
          language: "da",
          isReliable: true,
          confidence: 4.09
        }
      ]
    ]
  }
}

detectLanguage.languages(function(error, result) {
    console.log(JSON.stringify(result));
});

[
  {
    code: "ab",
    name: "ABKHAZIAN"
  },
  {
    code: "aa",
    name: "AFAR"
  },
  {
    code: "af",
    name: "AFRIKAANS"
  }
  ...
]

detectLanguage.status(function(error, result) {
    console.log(JSON.stringify(result));
});

{
  date: "2015-02-21",
  requests: 31,
  bytes: 429,
  plan: "FREE",
  plan_expires: null,
  daily_requests_limit: 5000,
  daily_bytes_limit: 1048576,
  status: "ACTIVE"
}