How to create Azure function using REST API ?

Domagoj Bazina 201

Greetings everyone,
I've been trying to create Azure function using REST API, link to the documentation (https://learn.microsoft.com/en-us/rest/api/appservice/web-apps/create-function). There is an example in the documentation, but it lacks additional information about body parameters.

Does anyone have an example of POST request to create Azure function, that includes body parameters?

There are two requests in this case:

Create & deploy Azure Function App, and then create & deploy sub-function (HTTP trigger, Time trigger, etc...) to it.
Create & deploy sub-function to the previously created Function App.

The second request is the one I'm looking for.

Thanks !

Randi Ratnayake 76 Reputation points

2022-06-09T12:39:50.087+00:00

Can you give it a good use cause of what you are trying to achieve here? When you can simply right functions on the portal itself and there is ample support in creating functions using C# or many other languages using VS Code/ Visual Studio so easily.
Domagoj Bazina 201 Reputation points

2022-06-09T14:03:03.703+00:00

I want to create functions dynamically, for example when some event occurs, I want to create azure function.

There are Python SDK examples, to create Storage Accounts, even Web Apps, but there is no example to create Azure function.

Accepted answer

MughundhanRaveendran-MSFT 12,481 Reputation points

2022-06-14T06:14:37.103+00:00

Hi @Domagoj Bazina ,

Thanks for reaching out to Q&A forum.

The document that you are referring is to create a function app. This is only a management operation. The same rest api cannot be used to deploy the functions/code. Please follow the below document to deploy functions/code to a Function app that is created already.

https://learn.microsoft.com/en-us/azure/azure-functions/deployment-zip-push#rest

I hope this helps! Feel free to reach out to me if you have any queries or concerns.

Please 'Accept as answer' and ‘Upvote’ if it helped so that it can help others in the community looking for help on similar topics.
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1 person found this answer helpful.
Domagoj Bazina 201 Reputation points

2022-06-15T09:39:10.883+00:00

Hello @MughundhanRaveendran-MSFT

Thanks for your answer, it helped me significantly.

But right now I'm facing different two complications:

I can't deploy .zip file to the Function App that uses Python as a runtime. I've done a little research, and found out that Linux servers do not support the option to deploy .zip files using REST API. Is it true? If that is true, it is a kind of problem, because Function App's that use Python as a runtime can only be created on Linux servers.

I've managed to deploy a .zip file with source code to the Function App that uses Node.js as a runtime. But the problem lies within the structure of the files/folders in that .zip file. Function App will "recognize sub-function" only if the .zip file contains source code of that exact function:
.zip
HttpExample1
function.json
index.js
sample.dat

But if the .zip file contains several sub-functions (HttpExample1, HttpExample2, etc...) and some other files (host.json file, local.settings.json, etc...), Function App won't recognize this structure. I think the reason for that is that unzipping that .zip file will result in one "master" folder that contains all those sub-folder and files, so the Function App can't recognize that structure.

Randi Ratnayake 76 Reputation points

2022-06-15T09:44:25.28+00:00

You should be able to use the Linux app service. Try to follow this article and create a function from scratch.

You don't need to use the REST API. Use Azure CLI or PowerShell modules to deploy your solution.

https://learn.microsoft.com/en-us/azure/azure-functions/create-first-function-cli-python?tabs=azure-cli%2Cbash%2Cbrowser

Domagoj Bazina 201 Reputation points

2022-06-15T14:25:07.15+00:00

Do you understand that I want to use the REST API exclusively ?
I know that there is option to create it using Portal, Azure CLI, Powershell or whatever other option but I don't want to do it like that.
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Randi Ratnayake 76 Reputation points

2022-06-09T15:29:14.397+00:00

First of all, this isn't anything to do with API-M so you can take that tag off.

Secondly, I am not sure architecturally that what you are trying to do is scalable and maintainable. What I see is you must have some orchestrator function that responds to the events and invokes different functions depending on your event type/ requirement to execute different kinds of logic. I strongly recommend you to look into durable functions
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Domagoj Bazina 201 Reputation points

2022-06-09T15:51:48.067+00:00

Okay, could You please explain to me what is purpose of this (https://learn.microsoft.com/en-us/rest/api/appservice/web-apps/create-function), or how does it work?

Randi Ratnayake 76 Reputation points

2022-06-14T06:24:27.377+00:00

The answer below from @MughundhanRaveendran-MSFT is what that function is, therefore.
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