quickstart.js

/**
 * Copyright 2017, Google, Inc.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

'use strict';

// [START language_quickstart]
// Imports the Google Cloud client library
const Language = require('@google-cloud/language');

// Instantiates a client
const language = Language();

// The text to analyze
const text = 'Hello, world!';

const document = {
  'content': text,
  type: 'PLAIN_TEXT'
};

// Detects the sentiment of the text
language.analyzeSentiment({'document': document})
  .then((results) => {
    const sentiment = results[0].documentSentiment;

    console.log(`Text: ${text}`);
    console.log(`Sentiment score: ${sentiment.score}`);
    console.log(`Sentiment magnitude: ${sentiment.magnitude}`);
  })
  .catch((err) => {
    console.error('ERROR:', err);
  });
// [END language_quickstart]