How to Generate Refresh Tokens in Office 365 with Node.js

Here's a step-by-step guide on how to create refresh tokens in Office 365 using Node.js:

1. Install the Required Dependencies:

   Begin by installing the necessary package using the following command in your terminal or command prompt:

npm install msal

2. **Create the `refreshToken.js` File and Import the MSAL Library:**

Create a new JavaScript file named `refreshToken.js` and import the `msal` library:

```javascript
const msal = require('@azure/msal-node');

3. Configure the Client Application:

   Create a new instance of the ConfidentialClientApplication class. Replace the placeholders with your actual Office 365 client ID, client secret, and tenant ID:

const config = { auth: { clientId: 'your-client-id', clientSecret: 'your-client-secret', authority: https://login.microsoftonline.com/your-tenant-id, }, };

const cca = new msal.ConfidentialClientApplication(config);

4. **Acquire the Refresh Token:**

Call the `acquireTokenByDeviceCode` method to obtain a refresh token. Specify the required scopes, like access to the Microsoft Graph API:

```javascript
const tokenRequest = {
scopes: ['https://graph.microsoft.com/.default'],
};

cca.acquireTokenByDeviceCode(tokenRequest)
.then((response) => {
 console.log(response);
})
.catch((error) => {
 console.log(error);
});

5. Run the Script:

   Execute the script using the following command:

node refreshToken.js

6. **Authorize the Application:**

Follow the prompts to sign in and authorize your application. After successful authorization, the script will output a JSON object containing the access token, refresh token, and other relevant information.

**Important Note:** The refresh token is valid for 90 days and can be used to retrieve new access tokens before it expires.