Get Access Token in Office 365 with Node.js - OAuth2 Flow

To get the access token in Node.js, you can use the 'request' module to make a POST request to the Azure AD OAuth2 token endpoint. Here's an example code snippet:

const request = require('request');

const tenantId = '<your-tenant-id>';
const clientId = '<your-client-id>';
const clientSecret = '<your-client-secret>';
const redirectUri = '<your-redirect-uri>';
const code = '<the-code-you-received>';

const tokenEndpoint = `https://login.microsoftonline.com/${tenantId}/oauth2/v2.0/token`;

const options = {
    method: 'POST',
    uri: tokenEndpoint,
    form: {
        grant_type: 'authorization_code',
        client_id: clientId,
        client_secret: clientSecret,
        redirect_uri: redirectUri,
        code: code
    },
    headers: {
        'Content-Type': 'application/x-www-form-urlencoded'
    }
};

request(options, (error, response, body) => {
    if (error) {
        console.error(error);
    } else {
        const accessToken = JSON.parse(body).access_token;
        console.log(accessToken);
    }
});

Replace the '', '', '', '', and '' placeholders with the corresponding values for your application.

This code sends a POST request to the token endpoint with the authorization code and other required parameters, and receives a JSON response that contains the access token. The access token is extracted from the response and printed to the console. You can use the access token to make API calls to Office 365 services.