{ "@odata.type": "#microsoft.graph.fileAttachment", "name": "invoice.pdf", "contentBytes": "SGVsbG8gV29ybGQh..." } Use code with caution.
Are you planning to build a (daemon) or a user-facing app for this integration?
You will need Mail.Read or Mail.ReadWrite permissions.
import requests endpoint = "https://microsoft.com{msg_id}/attachments/{att_id}/$value" headers = {'Authorization': 'Bearer ' + access_token} response = requests.get(endpoint, headers=headers) if response.status_code == 200: with open("downloaded_file.pdf", "wb") as f: f.write(response.content) print("Download successful!") Use code with caution. 5. Best Practices & Limitations
To use this, you must decode the contentBytes string in your application code. Method B: Downloading the Raw Stream (Recommended)
For developers building modern applications, the is the gold standard for interacting with Microsoft 365 data. Whether you are automating invoice processing or archiving communications, knowing how to efficiently download email attachments via Microsoft Graph is a critical skill.
For larger files or more efficient processing, you can append /$value to the URL. This tells Microsoft Graph to return the of the file instead of a JSON wrapper.
{ "@odata.type": "#microsoft.graph.fileAttachment", "name": "invoice.pdf", "contentBytes": "SGVsbG8gV29ybGQh..." } Use code with caution.
Are you planning to build a (daemon) or a user-facing app for this integration?
You will need Mail.Read or Mail.ReadWrite permissions.
import requests endpoint = "https://microsoft.com{msg_id}/attachments/{att_id}/$value" headers = {'Authorization': 'Bearer ' + access_token} response = requests.get(endpoint, headers=headers) if response.status_code == 200: with open("downloaded_file.pdf", "wb") as f: f.write(response.content) print("Download successful!") Use code with caution. 5. Best Practices & Limitations
To use this, you must decode the contentBytes string in your application code. Method B: Downloading the Raw Stream (Recommended)
For developers building modern applications, the is the gold standard for interacting with Microsoft 365 data. Whether you are automating invoice processing or archiving communications, knowing how to efficiently download email attachments via Microsoft Graph is a critical skill.
For larger files or more efficient processing, you can append /$value to the URL. This tells Microsoft Graph to return the of the file instead of a JSON wrapper.