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Tutorial: Call Microsoft Graph API from a Node/Express.js web app

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In this tutorial, you call Microsoft Graph API from a Node/Express.js web app. Once a user signs in, the app acquires an access token to call Microsoft Graph API.

This tutorial is part 3 of the 3-part tutorial series.

In this tutorial, you:

  • Update Node/Express.js web app to acquire an access token
  • Use the access token to call Microsoft Graph API.

Prerequisites

Add a UI components

  1. In your code editor, open views/index.hbs file, then add an View user profile link by using the following code snippet:

    <a href="/users/profile">View user profile</a>

    After you make the update, your views/index.hbs file should look similar to the following file:

       <h1>{{title}}</h1>
    {{#if isAuthenticated }}
    <p>Hi {{username}}!</p>
    <a href="/users/id">View ID token claims</a>
    <br>
    <a href="/users/profile">View user profile</a>
    <br>
    <br>
    <a href="/auth/signout">Sign out</a>
    {{else}}
    <p>Welcome to {{title}}</p>
    <a href="/auth/signin">Sign in</a>
    {{/if}}

  2. Create views/profile.hbs file, then add the following code:

    <h1>Microsoft Graph API</h1>
<h3>/me endpoint response</h3>
<table>
    <tbody>
        {{#each profile}}
        <tr>
            <td>{{@key}}</td>
            <td>{{this}}</td>
        </tr>
        {{/each}}
    </tbody>
</table>
<br>
<a href="/">Go back</a>
    • This page displays the user's profile details that Microsoft Graph API returns.

Acquire an access token

In your code editor, open the auth/AuthProvider.js file, then add getToken method in the AuthProvider class:

class AuthProvider {
    //...
        getToken(scopes, redirectUri = "http://localhost:3000/") {
            return  async function (req, res, next) {
                const msalInstance = authProvider.getMsalInstance(authProvider.config.msalConfig);
                try {
                    msalInstance.getTokenCache().deserialize(req.session.tokenCache);
    
                    const silentRequest = {
                        account: req.session.account,
                        scopes: scopes,
                    };
                    const tokenResponse = await msalInstance.acquireTokenSilent(silentRequest);
    
                    req.session.tokenCache = msalInstance.getTokenCache().serialize();
                    req.session.accessToken = tokenResponse.accessToken;
                    next();
                } catch (error) {
                    if (error instanceof msal.InteractionRequiredAuthError) {
                        req.session.csrfToken = authProvider.cryptoProvider.createNewGuid();
    
                        const state = authProvider.cryptoProvider.base64Encode(
                            JSON.stringify({
                                redirectTo: redirectUri,
                                csrfToken: req.session.csrfToken,
                            })
                        );
                        
                        const authCodeUrlRequestParams = {
                            state: state,
                            scopes: scopes,
                        };
    
                        const authCodeRequestParams = {
                            state: state,
                            scopes: scopes,
                        };
    
                        authProvider.redirectToAuthCodeUrl(
                            req,
                            res,
                            next,
                            authCodeUrlRequestParams,
                            authCodeRequestParams,
                            msalInstance
                        );
                    }
    
                    next(error);
                }
            };
        }
}
    //...

The getToken method uses the specified scope to acquire an access token

Add call API route

In your code editor, open the routes/users.js file, then add the following route:

router.get(
    "/profile",
    isAuthenticated,
    authProvider.getToken(["User.Read"]), // check if user is authenticated
    async function (req, res, next) {
    const graphResponse = await fetch(
        GRAPH_ME_ENDPOINT,
        req.session.accessToken,
    );
    if (!graphResponse.id) {
        return res 
        .status(501) 
        .send("Failed to fetch profile details"); 
    }
    res.render("profile", {
        profile: graphResponse,
    });
    },
);

  • You trigger the /profile route when the customer user selects the View user profile link. The app:

    • Acquires an access token with the User.Read permission.
    • Makes a call to Microsoft Graph API to read the signed-in user's profile.
    • Displays the user details in the profile.hbs UI.

Call Microsoft Graph API

Create fetch.js file, then add the following code:

var axios = require('axios');
var authProvider = require("./auth/AuthProvider");

/**
 * Makes an Authorization "Bearer" request with the given accessToken to the given endpoint.
 * @param endpoint
 * @param accessToken
 * @param method
 */
const fetch = async (endpoint, accessToken, method = "GET", data = null) => {
    const options = {
        headers: {
            Authorization: `Bearer ${accessToken}`,
        },
    };

    console.log(`request made to ${endpoint} at: ` + new Date().toString());

    try{
        const response = await axios.get(endpoint, options);
        return await response.data;

    }catch(error){
        throw new Error(error);
    }

};

module.exports = { fetch };

The actual API call happens in the fetch.js file.

Run and test the Node/Express.js web app

  1. Use the steps in Run and test the Node/Express.js web app to run your web app.
  2. Once you sign in, select View user profile link. If your app works correctly, you should see the signed-in user's profile as read from Microsoft Graph API.

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