@google-cloud/vision

@google-cloud/vision

Google Cloud Vision Client Library for Node.js

This is a Beta release of Google Cloud Vision. 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 Vision? You might want to check out google-cloud.

• API Documentation
• Official Documentation

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

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

// Read the text from an image.
vision.detectText('./image.jpg', function(err, text) {
  // text = [
  //   'This was text found in the image',
  //   'This was more text found in the image'
  // ]
});

// Detect faces and the locations of their features in an image.
vision.detectFaces('./image.jpg', function(err, faces) {
  // faces = [
  //   {
  //     angles: {pan,tilt,roll},
  //     bounds: {
  //       head: [{x,y},{x,y},{x,y},{x,y}],
  //       face: [{x,y},{x,y},{x,y},{x,y}]
  //     },
  //     features: {
  //       confidence: 34.489909,
  //       chin: {
  //         center: {x,y,z},
  //         left: {x,y,z},
  //         right: {x,y,z}
  //       },
  //       ears: {
  //         left: {x,y,z},
  //         right: {x,y,z}
  //       },
  //       eyebrows: {
  //         left: {
  //           left: {x,y,z},
  //           right: {x,y,z},
  //           top: {x,y,z}
  //         },
  //         right: {
  //           left: {x,y,z},
  //           right: {x,y,z},
  //           top: {x,y,z}
  //         }
  //       },
  //       eyes: {
  //         left: {
  //           bottom: {x,y,z},
  //           center: {x,y,z},
  //           left: {x,y,z},
  //           pupil: {x,y,z},
  //           right: {x,y,z},
  //           top: {x,y,z}
  //         },
  //         right: {
  //           bottom: {x,y,z},
  //           center: {x,y,z},
  //           left: {x,y,z},
  //           pupil: {x,y,z},
  //           right: {x,y,z},
  //           top: {x,y,z}
  //         }
  //       },
  //       forehead: {x,y,z},
  //       lips: {
  //         bottom: {x,y,z},
  //         top: {x,y,z}
  //       },
  //       mouth: {
  //         center: {x,y,z},
  //         left: {x,y,z},
  //         right: {x,y,z}
  //       },
  //       nose: {
  //         bottom: {
  //           center: {x,y,z},
  //           left: {x,y,z},
  //           right: {x,y,z}
  //         },
  //         tip: {x,y,z},
  //         top: {x,y,z}
  //       }
  //     },
  //     confidence: 56.748849,
  //     blurry: false,
  //     dark: false,
  //     happy: false,
  //     hat: false,
  //     mad: false,
  //     sad: false,
  //     surprised: false
  //   }
  // ]
});

// Promises are also supported by omitting callbacks.
vision.detectFaces('./image.jpg').then(function(data) {
  var faces = data[0];
});

// It's also possible to integrate with third-party Promise libraries.
var vision = require('@google-cloud/vision')({
  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 vision = require('@google-cloud/vision')({
  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 Vision API

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

• If you want to use a new service account, click on Create new Client ID and select Service account. After the account 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 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 vision = require('@google-cloud/vision')({
  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!