topic Re: Bearer Token support for Fabric REST API in Data Engineering

Bearer Token support for Fabric REST API

ati_puri — Thu, 18 Dec 2025 07:25:52 GMT

Fabric REST API source system only supporting bearer authorization process. Can someone help with the process. As within fabric we have SPN/Entra ID and basic authentication mechanisms.

Re: Bearer Token support for Fabric REST API

mabdollahi — Thu, 18 Dec 2025 08:14:28 GMT

Fabric REST APIs don’t use basic auth. They only accept bearer tokens, and those tokens come from Microsoft Entra ID.

So even though Fabric supports Service Principals and Entra ID, the REST API itself always expects:

Authorization: Bearer <access_token>

In practice, you authenticate with Entra ID (usually using a service principal), Entra issues an access token, and that token is passed to Fabric as a bearer token.

You just need to:

Enable Service principals can use Fabric APIs in tenant settings
Give the SPN access to the workspace or items
Use OAuth 2.0 (client credentials flow) to get the token
Here you can find a quick start using Fabric APIs: https://learn.microsoft.com/en-us/rest/api/fabric/articles/get-started/fabric-api-quickstart

Regards,
Mehrdad Abdollahi

ati_puri

Re: Bearer Token support for Fabric REST API

ati_puri — Thu, 18 Dec 2025 09:11:23 GMT

Actually we are trying to acess a data source API and the only authorization provided in bearer token, we did it now using AKV(bearer token stored here) and used this AKV secret in copy job source-> additional headers.

This helped us to use bearer token from customer API.