Supported languages in Azure Functions

2025-09-19

This article explains the levels of support offered for your preferred language when you use Azure Functions. It also describes strategies for creating function apps when you use languages that aren't natively supported.

Levels of support

There are two levels of support:

Generally available (GA) - Fully supported and approved for production use.
Preview - Not yet supported, but expected to reach GA status in the future.

Languages by runtime version

Language	1.x	2.x¹	3.x¹	4.x
C#	GA (.NET Framework 4.8)	GA (.NET Core 2.1)	GA (.NET Core 3.1)	GA (.NET 6.0) GA (.NET 7.0) GA (.NET Framework 4.8)
JavaScript	GA (Node.js 6)	GA (Node.js 10 & 8)	GA (Node.js 14, 12, & 10)	GA (Node.js 18, 16, & 14)
F#	GA (.NET Framework 4.8)	GA (.NET Core 2.1¹)	GA (.NET Core 3.1)	GA (.NET 6.0) GA (.NET 7.0)
Java	N/A	GA (Java 8)	GA (Java 11 & 8)	GA (Java 11 & 8) GA (Java 17)
PowerShell	N/A	N/A	N/A	GA (PowerShell 7.2)
Python	N/A	GA (Python 3.7)	GA (Python 3.9, 3.8, 3.7)	GA (Python 3.10, 3.9, 3.8, 3.7)
TypeScript²	N/A	GA	GA	GA

¹ Reached the end of life (EOL) on December 13, 2022. We highly recommend you migrating your apps to version 4.x for full support.
² Supported through transpiling to JavaScript.

See the language-specific developer guide article for more details about supported language versions.
For information about planned changes to language support, see Azure roadmap.

Language support details

The following table shows which languages supported by Functions can run on Linux or Windows. It also indicates whether there's support for editing each language in the Azure portal. The language is based on the Runtime stack option you select when you create your function app in the Azure portal. This value is the same as the --worker-runtime option that you specify when you use the func init command in Azure Functions Core Tools.

Language	Runtime stack	Linux	Windows	In-portal editing
C# (isolated worker model)	.NET	✓	✓
C# (in-process model)	.NET	✓	✓	^*
JavaScript	Node.js	✓	✓	✓
Python	Python	✓	X	✓
Java	Java	✓	✓
PowerShell	PowerShell Core	✓	✓	✓
TypeScript	Node.js	✓	✓
Go/Rust/other	Custom Handlers	✓	✓

^*Although we recommend local development for C# apps, you can use the portal to develop and test C# script functions that use the in-process model. For more information, see Create a C# script app.

For more information on operating system and language support, see Operating system support.

When in-portal editing isn't available, you must instead develop your function apps locally.

For more information about how to maintain full-support coverage while running your function apps in Azure, see Azure Functions language stack support policy.

Language major version support

Functions provides a guarantee of support for the major versions of supported programming languages. For most languages, there are minor or patch versions released to update a supported major version. Examples of minor or patch versions include Python 3.9.1 and Node 14.17. After new minor versions of supported languages become available, the minor versions used by your function apps are automatically upgraded to these newer minor or patch versions.

Note

Functions can remove the support of older minor versions after a new minor version is available. For this reason, you shouldn't pin your function apps to a specific minor or patch version of a programming language.

Custom handlers

Custom handlers are lightweight web servers that receive events from the Functions host. You can implement a custom handler in any language that supports HTTP primitives. As a result, you can use custom handlers to create function apps in languages that aren't officially supported. For more information, see Azure Functions custom handlers.