Simulate rate limits for any API and verify that your app won't break when it exceeds the API quota.
Tips and best practices for building applications on Microsoft 365 by Waldek Mastykarz - Microsoft 365 Developer Advocate

Easily test how your app will handle a slow API
Without changing your code, in minutes, see how your app responds to slow APIs. Learn where to improve your app's UI to keep it responsive and deliver a great user experience to your customers.

Mock nth request with Microsoft 365 Developer Proxy
Use Microsoft 365 Developer Proxy to mock n-th request, and more easily simulate scenarios that consist of several API requests.
Easily debug Microsoft Graph JavaScript SDK requests
Using the Microsoft Graph JavaScript SDK is a convenient way to connect your app to Microsoft 365. Here's how you can easily debug API requests issued from the SDK.
The easiest way to test how your app handles API errors
Building robust apps that use APIs doesn't have to be hard. There are tools that you can use to see for yourself how your app will behave when calling APIs that it uses fails.
Find a meeting time and schedule a meeting on Microsoft 365
Many work apps need the ability to schedule a meeting with others in their organization. Here's how to do it for apps connected to Microsoft 365.
Show upcoming meetings for a Microsoft 365 user with Microsoft Graph Toolkit
Recently, I showed you how you can build in under 10 minutes a simple personal assistant that shows users meetings they have left for the day. Here's an even easier way to do it using the Microsoft Graph Toolkit.
Show upcoming meetings for a Microsoft 365 user
Learn how you can build a simple personal assistant in under 10 minutes that'll show a Microsoft 365 user the meetings they have left for the day.