What kind info I need if I want to request user info from graph api of Microsoft?

To request user information from Microsoft Graph API, you will need to provide a valid access token and the user ID or user principal name (UPN) of the user you want to retrieve information for.

The exact information you can retrieve depends on the permissions granted by the access token you use to make the request. Some common pieces of information you can retrieve for a user include their display name, email address, job title, department, and manager.

Here's an example of the request URL you could use to retrieve basic information for a user with the UPN "johndoe@example.com":

https://graph.microsoft.com/v1.0/users/johndoe@example.com

In addition to the basic user properties, you can also retrieve more detailed information such as the user's calendar events, OneDrive files, and Teams messages, depending on the permissions you have been granted.

How can I get the access token?

To obtain an access token for the Microsoft Graph API, you need to authenticate the user and obtain their consent to access the requested resources. You can do this using the OAuth 2.0 authorization code flow or the OAuth 2.0 implicit flow, depending on your scenario.

Here are the high-level steps for obtaining an access token:

1. Register your application in the Azure Portal and configure its permissions to access the desired resources in the Microsoft Graph API.

2. Redirect the user to the Microsoft login page to authenticate them and request their consent to access the requested resources.

3. Receive the authorization code or access token from the login page or via a redirect URL.

4. Use the authorization code or access token to request an access token from the Microsoft authentication server.

5. Use the access token to make API requests to the Microsoft Graph API.

The exact implementation details will depend on the programming language and framework you are using, as well as the specific requirements of your application. You can find more detailed information and code examples in the Microsoft Graph API documentation.

I would like to get the access token through client_id and client_secret

You can use the client credentials grant flow to obtain an access token using a client_id and client_secret.

Here is an example of how you can obtain an access token using the client_id and client_secret with the /token endpoint of the Microsoft Graph API:

POST https://login.microsoftonline.com/{tenant}/oauth2/v2.0/token
Content-Type: application/x-www-form-urlencoded

grant_type=client_credentials
&client_id={client_id}
&client_secret={client_secret}
&scope=https://graph.microsoft.com/.default

Replace {tenant}, {client_id}, and {client_secret} with the appropriate values for your Azure AD app registration.

This will return a JSON response that includes the access token you can use to call the Microsoft Graph API:

{
  "token_type": "Bearer",
  "expires_in": 3599,
  "ext_expires_in": 0,
  "access_token": "<access_token>"
}

You can then use the access_token value in the Authorization header of your API requests to the Microsoft Graph API.

Where can I get the client_id and client_secret? What's the tenant in url?

To get the client_id and client_secret for your Azure AD application, you need to follow these steps:

1. Go to the Azure portal and navigate to the Azure Active Directory blade.
2. Select App registrations and click on "New registration".
3. Enter a name for your application, and select the supported account types.
4. Enter the redirect URI for your application (e.g., https://localhost:3000/callback).
5. Click on "Register" to create the application.
6. On the application page, click on "Certificates & secrets" and then click on "New client secret".
7. Enter a description for the secret, select the expiration duration, and click "Add".
8. The client secret will be displayed on the next screen. Make sure to copy it, as you won't be able to access it again.

The tenant in the URL refers to the Azure AD tenant that your application is registered in. It can be either a domain name (e.g., contoso.onmicrosoft.com) or a directory ID (e.g., bc4f95e4-97e3-4c2d-8d5b-0b92d7f4839e). When you authenticate with Azure AD, you'll need to provide the tenant ID or domain name as part of the authentication request.

explain https://graph.microsoft.com/v1.0/users/$count

In Microsoft Graph API, the tenant ID is typically specified as a parameter in the access token that is used to authorize API requests. This means that the tenant ID does not need to be explicitly included in the API request URL. When you obtain an access token, the token will already contain information about the tenant, which is used by the API to determine the context in which the request is being made.

For example, when you make a request to the Microsoft Graph API for a user in a specific tenant, the API will use the tenant ID specified in the access token to retrieve the user from that tenant. This approach helps to simplify API requests and reduce the complexity of constructing URLs by making use of the information that is already contained in the access token.

What's the tenant concept in Azure AD?

In Azure Active Directory (Azure AD), a tenant is a dedicated instance of the Azure AD service that's created on behalf of an organization. It is a dedicated cloud-based service instance that an organization can use to manage authentication for employees, partners, and customers.

When an organization signs up for Azure AD, a tenant is automatically created for them in the Azure AD service. The tenant represents the organization's identity and access management service in the cloud. The tenant provides a unique identity namespace for the organization's users, apps, and groups and enables administrators to manage access to resources.

The tenant is used as part of the URL when accessing Azure AD resources such as the Azure portal, Azure AD Graph API, and Microsoft Graph API. It is also used to provide a unique identifier for the directory when registering applications and services that rely on Azure AD for authentication and authorization.

What's the Azure AD Graph API and Microsoft Graph API? and the differences between them

Azure AD Graph API and Microsoft Graph API are two APIs provided by Microsoft for managing resources in Azure AD and Office 365 respectively.

Azure AD Graph API is a RESTful API that provides programmatic access to Azure AD through HTTP requests. It allows developers to manage Azure AD resources such as users, groups, and applications. Azure AD Graph API is commonly used for scenarios like managing user accounts, groups, and applications in Azure AD.

On the other hand, Microsoft Graph API is a unified RESTful API that provides a single interface to access a wide range of Microsoft 365 services, including Office 365, Azure AD, OneDrive, SharePoint, and more. Microsoft Graph API allows developers to access and manipulate data across these services through a single endpoint. It provides a comprehensive set of APIs for different scenarios such as getting user information, accessing files, managing groups, and more.

The main difference between the two APIs is that Azure AD Graph API is focused on managing resources in Azure AD, while Microsoft Graph API is a broader API that encompasses a wider range of services. Another difference is that Azure AD Graph API is being deprecated and will be retired in June 2022, while Microsoft Graph API is the recommended API going forward for accessing resources in Microsoft 365 services.