Sample Dialogflow API 2.0 Chatbot Fulfillment

index.js

require("dotenv").config()

const express = require("express")
const bodyParser = require("body-parser")

const { WebhookClient } = require("dialogflow-fulfillment")

const app = express()

app.use(bodyParser.urlencoded({ extended: true }))
app.use(bodyParser.json())

app.post("/", (request, response) => {

    // https://github.com/dialogflow/dialogflow-fulfillment-nodejs/blob/master/docs/WebhookClient.md
    const agent = new WebhookClient({ request, response })

    const actionHandler = (agent) => {
        switch (agent.action) {
            case "test-action":
                agent.add("you triggered test-action!")
                break
            default:
                agent.add("you triggered an unhandled action")
                break
        }
    }

    agent.handleRequest(actionHandler)

})

const port = process.env.PORT || 8080
app.listen(port, () => console.log(`Webhook listening on port ${port}`))

package.json

{
  "name": "",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "prod": "cross-env NODE_ENV=production PORT=8080 node index.js",
    "dev": "nodemon index.js",
    "start": "npm run prod",
    "test": "mocha"
  },
  "keywords": [],
  "author": "Jose Naranjo",
  "license": "UNLICENSED",
  "devDependencies": {
    "mocha": "^5.2.0",
    "nodemon": "^1.17.5"
  },
  "dependencies": {
    "actions-on-google": "^2.2.0",
    "body-parser": "^1.18.3",
    "cross-env": "^5.2.0",
    "dialogflow-fulfillment": "^0.4.1",
    "dotenv": "^6.0.0",
    "express": "^4.16.3",
    "fb-messenger": "^1.2.0",
    "moment": "^2.22.2",
    "moment-timezone": "^0.5.21",
    "request-promise": "^4.2.2",
    "sleep-promise": "^8.0.1"
  }
}