Practice adal node.js

package.json

{
  "name": "practice_adal",
  "version": "0.0.1",
  "description": "Nothing special",
  "main": "index.js",
  "scripts": {
    "start": "ts-node server.ts"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "adal-node": "^0.1.28",
    "express": "^4.16.4",
    "morgan": "^1.9.1"
  },
  "devDependencies": {
    "@types/express": "^4.16.0",
    "@types/morgan": "^1.7.35",
    "@types/node": "^10.12.9"
  }
}

server.ts

// Requirement:
// Generate key pairs:
// ```
// openssl genrsa -out server.pem 2048
// openssl req -new -key server.pem -out server.csr
// openssl x509 -req -days 365 -in server.csr -signkey server.pem -out server.crt
// ```
// Upload server.crt to admin console

import * as express from 'express';
import * as morgan from "morgan";
import * as fs from 'fs';
import { AuthenticationContext } from 'adal-node';

function getPrivateKey(filename: string): string {
    return fs.readFileSync(filename, { encoding: 'utf8' });
}

const params = {
    tenant: 'finlandhelsinki.onmicrosoft.com',
    authorityHostUrl: 'https://login.windows.net',
    clientId: 'c0ad8f06-d5d7-482f-b8a7-972fa831c91a',
    thumbprint: '7BB17F9BCD1C1CB949F1002FB29F7D3050F55962',
    privateKeyFile: 'server.pem',
    resource: 'https://outlook.office365.com/',
};

const authorityUrl: string = params.authorityHostUrl + '/' + params.tenant;
const app: express.Application = express();
const port: number = 3000;

const context = new AuthenticationContext(authorityUrl);
const key = getPrivateKey(params.privateKeyFile);

app.use(morgan('dev'));

app.get('/token', (req, res) => {
    context.acquireTokenWithClientCertificate(
        params.resource,
        params.clientId,
        key,
        params.thumbprint,
        (err, tokenResponse) => {
            if (err) {
                res.send('well that didn\'t work: ' + err.stack);
            } else {
                res.send(tokenResponse);
            }
        }
    );
});

app.listen(port, () => {
    console.log(`token app listening on port ${port}!`);
    console.log(`Try: curl http://localhost:3000/token`);
});

Result:

{
    tokenType: "Bearer",
    expiresIn: 3599,
    expiresOn: "2018-11-19T19:31:07.515Z",
    resource: "https://outlook.office365.com/",
    accessToken: "JWT",
    isMRRT: true,
    _clientId: "{your client id}",
    _authority: "https://login.windows.net/{your tenant name}.onmicrosoft.com"
}