Generate DialogFlow V2 Access Token

dialogflow_v2.js

const googleAuth = require('google-oauth-jwt');

function generateAccessToken() {
 return new Promise((resolve) => {
  googleAuth.authenticate(
   {
    email: <client_email>,
    key: <private_key>,
    scopes: 'https://www.googleapis.com/auth/cloud-platform',
   },
   (err, token) => {
    resolve(token);
   },
  );
 });
}

If you want to generate the DialogFlow V2 access token through the "vanilla" way, you have come to the right place. In the above code, we will be using a nodejs package called, google-oauth-jwt, to help us generate the DialogFlow V2 access token.

You may find your client_email and private_key from the JSON key file you have downloaded from your Google Cloud Platform project's service account page. If you are unsure how/where to download it, you may checkout my blog post here.

To find out which scope which scope you may need, you may checkout the DialogFlow V2 REST API documentation page.