node-wit

Wit.AI wrapper for Node.JS

Quick start

1. You need to create an instance

2. Install Node.JS on your computer

3. Setup your project

Create a new Node.JS app :

$ mkdir myapp
$ cd myapp
$ npm init
...

Add node-wit as a dependencies in your package.json

  "dependencies": {
    "node-wit": "1.0.0"	
  },	

We will send some audio file to Wit.AI

You can use SoX to record WAV files from the command line. The following options will create a Wit-ready WAV file (press Ctrl+C to stop recording):

sox -d -b 16 -c 1 -r 16k sample.wav

Create a index.js file in myapp directory containing:

var wit = require('node-wit');
var fs = require('fs');
var ACCESS_TOKEN = "YOUR TOKEN HERE";

console.log("Sending text & audio to Wit.AI");

wit.captureTextIntent(ACCESS_TOKEN, "Hello world", function (err, res) {
    console.log("Error: ", err);
    console.log("Response from Wit", JSON.stringify(res, null, " "));
});

var stream = fs.createReadStream('sample.wav');
wit.captureSpeechIntent(ACCESS_TOKEN, stream, "audio/wav", function (err, res) {
    console.log("Error: ", err);
    console.log("Response from Wit", JSON.stringify(res, null, " "));
});

1. Start your app

$ node index.js
Sending text & audio to Wit.AI
Error:  null
Response from Wit {
 "msg_id": "2a029fb0-a962-42f1-b914-6f70a0a055be",
 "_text": "Hello world",
 "outcomes": [
  {
   "_text": "Hello world",
   "intent": "greetings_hi",
   "entities": {},
   "confidence": 0.929
  }
 ]
}
Error:  null
Response from Wit {
 "msg_id": "a067f9f8-ef7d-4adf-8ffa-4a5080544fdd",
 "_text": "what's the weather in New York",
 "outcomes": [
  {
   "_text": "what's the weather in New York",
   "intent": "weather",
   "entities": {
    "location": [
     {
      "suggested": true,
      "value": "New York"
     }
    ]
   },
   "confidence": 1
  }
 ]
}

Examples

API

captureTextIntent

The captureTextIntent function returns the meaning extracted from the text input. The function takes 3 parameters:

• access_token: Your access token for your instance
• text: The text input you want to extract the meaning of
• callback(error, response): A callback function get 3 arguments:
  1. An error when applicable
  2. A JSON object containing the Wit.AI response

var wit = require('node-wit');
wit.captureTextIntent(ACCESS_TOKEN, "Hello world", function (err, res) {
    console.log("Error: ", err);
    console.log("Response from Wit", JSON.stringify(res, null, " "));
});

captureSpeechIntent

The captureSpeechIntent function returns the meaning extracted from the audio input. The function takes 4 arguments:

• access_token: Your access token for your instance
• stream: The audio stream you want to extract the meaning of
• content-type: The content-type of your audio stream (audio/wav, audio/mpeg3, audio/raw;encoding=unsigned-integer;bits=16;rate=8000;endian=big, ...)
• callback(error, response): A callback function get 3 arguments:
  1. An error when applicable
  2. A JSON object containing the Wit.AI response

var wit = require('node-wit');
var stream = fs.createReadStream('sample.wav');
wit.captureSpeechIntent(ACCESS_TOKEN, stream, "audio/wav", function (err, res) {
    console.log("Error: ", err);
    console.log("Response from Wit", JSON.stringify(res, null, " "));
});