How to get Azure access token with Node js API using Axios - node.js

Question

I have a backend in Nodejs using Axios for my API calls. I need to implement Azure Authentication to get a token so I followed the sample below:
https://learn.microsoft.com/en-us/azure/active-directory/develop/quickstart-v2-nodejs-webapp-msal?WT.mc_id=Portal-Microsoft_AAD_RegisteredApps
The sample uses express and has redirects to first get and authorization and then a token, I have been trying to find a sample with Axios however I couldn't find one.
This is what I have so far, the idea is using the result to get a token,any guidance is much appreciate it.
const msal = require('#azure/msal-node');
const REDIRECT_URI = "http://localhost:3000/";
const LOGIN = "https://login.microsoftonline.com/";
const config = {
auth: {
clientId: "12345678910",
authority: "https://login.microsoftonline.com/12345678910",
clientSecret: "Secret",
knownAuthorities: ["https://login.microsoftonline.com/12345678910"
]
}
};
const pca = new msal.ConfidentialClientApplication(config);
module.exports = {
async getAzureAdToken(){
try {
let instance = axios.create({baseURL: LOGIN});
const authCodeUrlParameters = {
scopes: ["user.read"],
redirectUri: REDIRECT_URI
};
pca.getAuthCodeUrl(authCodeUrlParameters).then((response) =>{
let url = response.substring(LOGIN.length);
instance.get(url).then((result) =>{
});
}).catch((error) => console.log(JSON.stringify(error)));
} catch (error) {
throw error
}
},

Answer 1

You could use client credentials flow to get access token with axios. Client credentials flow permits a web service (confidential client) to use its own credentials, instead of impersonating a user, to authenticate when calling another web service. In the client credentials flow, permissions are granted directly to the application itself by an administrator. We need to add application permissions in API Permission.
Test in Postman:
POST https://login.microsoftonline.com/{tenant}/oauth2/v2.0/token
Content-Type: application/x-www-form-urlencoded
client_id=<client_id>
&scope=https://graph.microsoft.com/.default
&client_secret=<client_secret>
&grant_type=client_credentials
Code using Nodejs:
// Replace these values from the values of you app
const APP_ID = '[APP_ID/CLIENT_ID]';
const APP_SECERET = '[CLIENT_SECRET]';
const TOKEN_ENDPOINT ='https://login.microsoftonline.com/[TENANT_ID]/oauth2/v2.0/token';
const MS_GRAPH_SCOPE = 'https://graph.microsoft.com/.default';
const axios = require('axios');
const qs = require('qs');
const postData = {
client_id: APP_ID,
scope: MS_GRAPH_SCOPE,
client_secret: APP_SECERET,
grant_type: 'client_credentials'
};
axios.defaults.headers.post['Content-Type'] =
'application/x-www-form-urlencoded';
let token = '';
axios
.post(TOKEN_ENDPOINT, qs.stringify(postData))
.then(response => {
console.log(response.data);
})
.catch(error => {
console.log(error);
});