@google-cloud/language

@google-cloud/language

Google Cloud Natural Language Client Library for Node.js

This is a Beta release of Google Cloud Natural Language. This feature is not covered by any SLA or deprecation policy and may be subject to backward-incompatible changes.

Looking for more Google APIs than just Natural Language? You might want to check out google-cloud.

• API Documentation
• Official Documentation

$ npm install --save @google-cloud/language

var language = require('@google-cloud/language')({
  projectId: 'grape-spaceship-123',
  keyFilename: '/path/to/keyfile.json'
});

// Get the entities from a sentence.
language.detectEntities('Stephen of Michigan!', function(err, entities) {
  // entities = {
  //   people: ['Stephen'],
  //   places: ['Michigan']
  // }
});

// Create a document if you plan to run multiple detections.
var document = language.document('Contributions welcome!');

// Analyze the sentiment of the document.
document.detectSentiment(function(err, sentiment) {
  // sentiment = 100 // Large numbers represent more positive sentiments.
});

// Parse the syntax of the document.
document.annotate(function(err, annotations) {
  // annotations = {
  //   language: 'en',
  //   sentiment: 100,
  //   entities: {},
  //   sentences: ['Contributions welcome!'],
  //   tokens: [
  //     {
  //       text: 'Contributions',
  //       partOfSpeech: 'Noun (common and proper)',
  //       partOfSpeechTag: 'NOUN'
  //     },
  //     {
  //       text: 'welcome',
  //       partOfSpeech: 'Verb (all tenses and modes)',
  //       partOfSpeechTag: 'VERB'
  //     },
  //     {
  //       text: '!',
  //       partOfSpeech: 'Punctuation',
  //       partOfSpeechTag: 'PUNCT'
  //     }
  //   ]
  // }
});

// Promises are also supported by omitting callbacks.
document.annotate().then(function(data) {
  var annotations = data[0];
});

// It's also possible to integrate with third-party Promise libraries.
var language = require('@google-cloud/language')({
  promise: require('bluebird')
});

Authentication

It's incredibly easy to get authenticated and start using Google's APIs. You can set your credentials on a global basis as well as on a per-API basis. See each individual API section below to see how you can auth on a per-API-basis. This is useful if you want to use different accounts for different Google Cloud services.

On Google Compute Engine

If you are running this client on Google Compute Engine, we handle authentication for you with no configuration. You just need to make sure that when you set up the GCE instance, you add the correct scopes for the APIs you want to access.

// Authenticating on a global basis.
var projectId = process.env.GCLOUD_PROJECT; // E.g. 'grape-spaceship-123'

var language = require('@google-cloud/language')({
  projectId: projectId
});

// ...you're good to go!

Elsewhere

If you are not running this client on Google Compute Engine, you need a Google Developers service account. To create a service account:

1. Visit the Google Developers Console.
2. Create a new project or click on an existing project.
3. Navigate to APIs & auth > APIs section and turn on the following APIs (you may need to enable billing in order to use these services):

• Google Cloud Natural Language API

1. Navigate to APIs & auth > Credentials and then:

• If you want to use a new service account key, click on Create credentials and select Service account key. After the account key is created, you will be prompted to download the JSON key file that the library uses to authenticate your requests.
• If you want to generate a new service account key for an existing service account, click on Generate new JSON key and download the JSON key file.

var projectId = process.env.GCLOUD_PROJECT; // E.g. 'grape-spaceship-123'

var language = require('@google-cloud/language')({
  projectId: projectId,

  // The path to your key file:
  keyFilename: '/path/to/keyfile.json'

  // Or the contents of the key file:
  credentials: require('./path/to/keyfile.json')
});

// ...you're good to go!