Grant access to Common Data Service with adal-node - node.js

Question

Cannot grant access to Common Data Service with NodeJS
I am implementing a simple Node function which will get some data from Common Data Service. I can get the accessToken already, but when I use this accessToken to access Common Data Service, the response is ‘Unauthorized’.
I followed the instruction here ( https://learn.microsoft.com/en-us/powerapps/developer/common-data-service/walkthrough-registering-configuring-simplespa-application-adal-js ) and is able to get it worked with simple page app.
I just want to port it to Node and have the app grant access to Common Data Service without requiring a user to login.
const fetch = require('node-fetch');
const AuthenticationContext = require('adal-node').AuthenticationContext;
module.exports = async function (context, req) {
context.log('JavaScript HTTP trigger function processed a request.');
const resource = "https://my-org.crm5.dynamics.com";
const clientId = 'my client id';
const clientSecret = 'my client secret';
const authorityHostUrl = 'https://login.microsoftonline.com';
const tenant = 'my-tenant-name.onmicrosoft.com'; // AAD Tenant name.
const authorityUrl = authorityHostUrl + '/' + tenant;
const authContext = new AuthenticationContext(authorityUrl);
const tokenResp = await new Promise((resolve, reject) => {
authContext.acquireTokenWithClientCredentials(resource, clientId, clientSecret, function (err, tokenResponse) {
if (err) {
context.error("cannot get token: " + err.stack);
return reject(err.stack);
} else {
return resolve(tokenResponse);
}
});
});
context.log("tokenResp: ", tokenResp); // The tokenResp contains accessToken
const cdsHeaders = {};
cdsHeaders["Authorization"] = "Bearer " + tokenResp.accessToken;
cdsHeaders["Accept"] = "application/json";
cdsHeaders["Content-Type"] = "application/json; charset=utf-8";
cdsHeaders["OData-MaxVersion"] = "4.0";
cdsHeaders["OData-Version"] = "4.0";
const endpointUrl = encodeURI(resource + "/api/data/v9.0/accounts?$select=name,address1_city&$top=10");
const dataResponse = await fetch(endpointUrl, { method: 'GET', headers: cdsHeaders });
console.log("response: ", dataResponse); // The dataResponse is 401 Unauthorized
context.res = { body: "Done" };
};

Answer 1

I got the solution: I have to 'Manually create a CDS for Apps application user' in order for it to work, regarding this document: https://learn.microsoft.com/en-us/powerapps/developer/common-data-service/authenticate-oauth#connect-as-an-app
Although the sample code is in C#, there are not too many differences between C# and Node.js clients.