Office 365 Access Token Expiration: Node.js Refresh and Best Practices

When the access token expires in Office 365 while using Node.js, you can follow these steps to ensure uninterrupted access to resources:

1. Use the refresh token to obtain a new access token.
2. If you don't have a refresh token, you'll need to authenticate the user again to obtain a new access token.
3. Utilize the Microsoft Graph API to refresh the token. Here's a sample code:

const authContext = new AuthenticationContext(authorityUrl);
authContext.acquireTokenWithRefreshToken(refreshToken, clientId, clientSecret, resource, (err, tokenResponse) => {
  if (err) {
    // Handle error
  } else {
    // Use the new access token
    const accessToken = tokenResponse.accessToken;
  }
});

4. Implement a token cache to automatically handle token refreshes. Here's a sample code:

const tokenCache = new adal.MemoryCache();
const authContext = new AuthenticationContext(authorityUrl, null, tokenCache);
authContext.acquireToken(resource, clientId, username, password, (err, tokenResponse) => {
  if (err) {
    // Handle error
  } else {
    // Use the access token
    const accessToken = tokenResponse.accessToken;
  }
});

By incorporating these steps into your Node.js application, you can prevent interruptions caused by expired access tokens and ensure seamless interaction with Office 365 resources.