Jwt Bearer Authentication in a function app

Question

Jwt Bearer Authentication in a function app

Parag Kale 20

Hi,

Is there an example available of implementing jwt bearer authentication in a function app ?

I am using the durable function monitor tool https://github.com/microsoft/DurableFunctionsMonitor in injected mode in isolated worker model.

I want to authenticate calls to /api/durable-functions-monitor end point , because my other functions in the function app use authorization level as Function and we don't want to establish a separate dedicated function app just for durable function monitor

Hence what we are trying to accomplish is use jwt bearer authentication just to secure the endpoint /api/durable-functions-monitor

Praveen Kumar Gudipudi 170 Reputation points Microsoft External Staff

2025-04-30T00:36:05.0733333+00:00

Hello @Parag Kale,

Please find the Azure Functions with JWT Authentication steps below,

Issuing the JWT

JSON Web Tokens are simply a mechanism for securely transferring JSON strings. Rather than having the user pass credentials back and forth on each call and then checking the user’s credentials over and over, we can simply retrieve the relevant information about the user and encrypt it into a token which we return to the client as a cookie. When the client makes subsequent calls, the client passes the JWT back which the application will decrypt and verify that the contents are valid.

Note that because the token is passed with each request, you’ll want to be cautious not to go overboard and only add key data like the username, user ID, user email, role(s) and so on.

We’re going to use the JWT package to generate and parse our tokens:

Please follow below documents to configure JWT token in your function app: https://charliedigital.com/2020/05/24/azure-functions-with-jwt-authentication/

https://stackoverflow.com/questions/64345657/implement-bearer-token-authentication-for-azure-functions

If you have any further queries, please feel free to reach out us.
Praveen Kumar Gudipudi 170 Reputation points Microsoft External Staff

2025-05-01T10:58:33.93+00:00

Hello @Parag Kale,

Following up to see if you have chance to check my previous response if that helps you to resolve your issue, please let us know.
Praveen Kumar Gudipudi 170 Reputation points Microsoft External Staff

2025-05-02T19:34:15.6633333+00:00

Hello @Parag Kale,

We haven't heard back from you yet, and I wanted to ensure everything is on track and see if there's anything more, we can assist you with.

Your answer

Praveen Kumar Gudipudi 170 Reputation points Microsoft External Staff

2025-04-30T00:36:05.0733333+00:00

Hello @Parag Kale,

Please find the Azure Functions with JWT Authentication steps below,

Issuing the JWT

JSON Web Tokens are simply a mechanism for securely transferring JSON strings. Rather than having the user pass credentials back and forth on each call and then checking the user’s credentials over and over, we can simply retrieve the relevant information about the user and encrypt it into a token which we return to the client as a cookie. When the client makes subsequent calls, the client passes the JWT back which the application will decrypt and verify that the contents are valid.

Note that because the token is passed with each request, you’ll want to be cautious not to go overboard and only add key data like the username, user ID, user email, role(s) and so on.

We’re going to use the JWT package to generate and parse our tokens:

Please follow below documents to configure JWT token in your function app: https://charliedigital.com/2020/05/24/azure-functions-with-jwt-authentication/

https://stackoverflow.com/questions/64345657/implement-bearer-token-authentication-for-azure-functions

If you have any further queries, please feel free to reach out us.
Praveen Kumar Gudipudi 170 Reputation points Microsoft External Staff

2025-05-01T10:58:33.93+00:00

Hello @Parag Kale,

Following up to see if you have chance to check my previous response if that helps you to resolve your issue, please let us know.
Praveen Kumar Gudipudi 170 Reputation points Microsoft External Staff

2025-05-02T19:34:15.6633333+00:00

Hello @Parag Kale,

We haven't heard back from you yet, and I wanted to ensure everything is on track and see if there's anything more, we can assist you with.

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Jwt Bearer Authentication in a function app

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