Simple Node.js CLI app that accesses MS Graph using "confidential client credentials" authentication. Basically this https://learn.microsoft.com/en-us/entra/identity-platform/tutorial-v2-nodejs-console with minor additions.

• Clone from Github.
• Enter the app folder and run yarn install.
• Copy .env.example to .env and set the vars.

Run node . --op operation where operation is one of

• getUsers -- List of all users in the tenant. See https://learn.microsoft.com/en-us/graph/api/user-list?view=graph-rest-1.0&tabs=http
• getUser -- Details of the .env:MAIL_FROM user, may be a shared mailbox. See https://learn.microsoft.com/en-us/graph/api/user-get?view=graph-rest-1.0&tabs=http
• sendMail -- Sends a test message from .env:MAIL_FROM to .env:MAIL_TO. See https://learn.microsoft.com/en-us/graph/api/user-sendmail?view=graph-rest-1.0&tabs=http