Mail.ReadWrite

// npm install @azure/msal-browser @microsoft/microsoft-graph-client
import { PublicClientApplication } from "@azure/msal-browser";
import { Client } from "@microsoft/microsoft-graph-client";
import { AuthCodeMSALBrowserAuthenticationProvider } from 
    "@microsoft/microsoft-graph-client/authProviders/authCodeMsalBrowser";

const msalConfig = {
    auth: {
        clientId: "YOUR_CLIENT_ID",
        authority: "https://login.microsoftonline.com/YOUR_TENANT_ID"
    }
};

const pca = new PublicClientApplication(msalConfig);
await pca.initialize();

// Delegated: Login with required scope
const loginResponse = await pca.loginPopup({
    scopes: ["Mail.ReadWrite"]
});

const authProvider = new AuthCodeMSALBrowserAuthenticationProvider(pca, {
    account: loginResponse.account,
    scopes: ["Mail.ReadWrite"],
    interactionType: "popup"
});

const graphClient = Client.initWithMiddleware({ authProvider });

// Example: GET /me
const result = await graphClient.api("/me").get();
console.log(result);

// Application: Use client credentials (Node.js backend only)
// npm install @azure/identity @microsoft/microsoft-graph-client
import { ClientSecretCredential } from "@azure/identity";
import { TokenCredentialAuthenticationProvider } from 
    "@microsoft/microsoft-graph-client/authProviders/azureTokenCredentials";

const credential = new ClientSecretCredential(
    "YOUR_TENANT_ID",
    "YOUR_CLIENT_ID", 
    "YOUR_CLIENT_SECRET"
);

const authProvider = new TokenCredentialAuthenticationProvider(credential, {
    scopes: ["https://graph.microsoft.com/.default"]
});

const graphClient = Client.initWithMiddleware({ authProvider });
const result = await graphClient.api("/users").get();
console.log(result);

# Install Microsoft Graph PowerShell module
Install-Module Microsoft.Graph -Scope CurrentUser

# Delegated access - interactive sign-in
Connect-MgGraph -Scopes "Mail.ReadWrite"

# Verify connection
Get-MgContext | Select-Object Account, TenantId, Scopes

# Example: GET /me
$result = Invoke-MgGraphRequest -Method GET -Uri "https://graph.microsoft.com/v1.0/me"
$result | ConvertTo-Json -Depth 5

# Application access with certificate
$params = @{
    ClientId = "YOUR_CLIENT_ID"
    TenantId = "YOUR_TENANT_ID"
    CertificateThumbprint = "YOUR_CERT_THUMBPRINT"
}
Connect-MgGraph @params

# Or with client secret (not recommended for production)
# Connect-MgGraph -ClientSecretCredential $credential

# Example: GET /users
$result = Invoke-MgGraphRequest -Method GET -Uri "https://graph.microsoft.com/v1.0/users"
$result | ConvertTo-Json -Depth 5

# Always disconnect when done
Disconnect-MgGraph

# pip install msgraph-sdk azure-identity
from azure.identity import InteractiveBrowserCredential, ClientSecretCredential
from msgraph import GraphServiceClient
import asyncio

# Delegated permissions - interactive browser sign-in
credential = InteractiveBrowserCredential(
    client_id="YOUR_CLIENT_ID",
    tenant_id="YOUR_TENANT_ID"
)
scopes = ["Mail.ReadWrite"]
client = GraphServiceClient(credential, scopes)

async def get_data():
    # Example: GET /me
    result = await client.me.get()
    print(f"User: {result.display_name}")
    return result

asyncio.run(get_data())

# Application permissions - client credentials
credential = ClientSecretCredential(
    tenant_id="YOUR_TENANT_ID",
    client_id="YOUR_CLIENT_ID",
    client_secret="YOUR_CLIENT_SECRET"
)
scopes = ["https://graph.microsoft.com/.default"]
client = GraphServiceClient(credential, scopes)

async def get_users():
    # Example: GET /users
    result = await client.users.get()
    for user in result.value:
        print(f"User: {user.display_name}")
    return result

asyncio.run(get_users())