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Azure Functions Core Tools

The Azure Functions Core Tools provide a local development experience for creating, developing, testing, running, and debugging Azure Functions.

Helpful Documentation

• Code and test Azure Functions locally
• Get started with Kubernetes using Core Tools

Usage

func [context] <action> [-/--options] [--help]

Global Options

These options are available for all commands:

• --script-root <PATH>: Set the root directory of the function app. Changes the working directory to the specified path. Defaults to the current directory.
• -v | --version: Display the version of Azure Functions Core Tools.
• -h | --help: Display help information about Azure Functions Core Tools or a specific command.

For more detailed usage information, run func --help.

Versions

v1 (v1.x branch): Requires .NET 4.7.1 Windows Only

v4: (main branch): Self-contained cross-platform package (recommended)

Installing the CLI

Windows

msi

npm

chocolatey

[!NOTE] To debug Azure Functions in VSCode, the 64-bit version is required. This is now the default installation. However, if needed, you can explicitly specify it using the following parameter: --params "'/x64'"

winget

Mac

homebrew

If upgrading to a new version, you may have to run brew update to pull the latest formula before you run the install command. Or, you can run brew upgrade.

[!NOTE] Homebrew allows side-by-side installation of v2 and v3. You can switch versions with:

brew link --overwrite azure-functions-core-tools@3

Linux

Installation for Linux requires two steps:

1. Setting up the package feed
2. Installing the tools

1. Set up package feed

Ubuntu

Debian 12

export DEBIAN_VERSION=12

apt-get update && apt-get install gpg wget  -y

wget -qO- https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor | tee /usr/share/keyrings/microsoft-prod.gpg
wget -q https://packages.microsoft.com/config/debian/$DEBIAN_VERSION/prod.list

mv prod.list /etc/apt/sources.list.d/microsoft-prod.list

chown root:root /usr/share/keyrings/microsoft-prod.gpg
chown root:root /etc/apt/sources.list.d/microsoft-prod.list

apt-get update && apt-get install azure-functions-core-tools-4  -y
apt-get update && apt-get install libicu-dev  -y

2. Install

Other Distributions

npm can be used on all platforms. On unix platforms, you may need to specify --unsafe-perm if you are running npm with sudo. That's due to npm behavior of post install script.

Alternatively, you can install the CLI manually by downloading the latest release from the GitHub repo:

1. Download the latest release for your platform from here.

2. Unzip the CLI package

   • Using your preferred tool, unzip the downloaded release. To unzip into an azure-functions-cli directory using the unzip tool, run this command from the directory containing the downloaded release zip:

   unzip -d azure-functions-cli Azure.Functions.Cli.linux-x64.*.zip

3. Make the func command executable

   • Zip files do not maintain the executable bit on binaries. So, you'll need to make the func binary, as well as gozip (used by func during packaging) executables. Assuming you used the instructions above to unzip:

   cd azure-functions-cli
   chmod +x func
   chmod +x gozip
   ./func --version # Test the executable
   

4. Optionally add func to your $PATH

   • To execute the func command without specifying the full path to the binary, add its directory to your $PATH environment variable. Assuming you're still following along from above:

   export PATH=`pwd`:$PATH
   func
   

Default Directories

• CurrentDirectory: is the default directory the functions runtime looks for functions in.
• %TMP%\LogFiles\Application\Functions: is the default directory for logs. It mirrors the logs directory on Azure as well.

Telemetry

The Azure Functions Core tools collect usage data in order to help us improve your experience. The data is anonymous and doesn't include any user specific or personal information. The data is collected by Microsoft.

You can opt-out of telemetry by setting the FUNCTIONS_CORE_TOOLS_TELEMETRY_OPTOUT environment variable to '1' or 'true' using your favorite shell.

Microsoft privacy statement

License

This project is under the benevolent umbrella of the .NET Foundation and is licensed under the MIT License

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.

Contact Us

For questions on Azure Functions or the tools, you can ask questions here:

• Azure Functions Q&A Forum
• Azure-Functions tag on StackOverflow

File bugs at Azure Functions Core Tools repo on GitHub.