---
id: azurefunctions-extensions-base
version: "1.2.0"
license: MIT License
license_treatment: permissive
maintenance: active
---

# azurefunctions-extensions-base — Base Python worker extension for Azure Functions.

License: permissive · Maintenance: active · Downloads: 80.6K/mo

## What it is and what it does

azurefunctions-extensions-base is a foundational library for the Azure Functions Python worker that enables custom extensions to recognize and bind to SDK types and HttpV2 types. It is not designed for direct use; instead, it serves as the base layer for specialized extension packages that add specific bindings (blob storage, Cosmos DB, Event Hubs, Service Bus) and protocol handlers (FastAPI over HTTP).

The package has no runtime dependencies and installs with low friction. It supports Python 3.8 and later, with active maintenance as of mid-2026. Developers should install this only as a transitive dependency of an extending package, not directly in application code.

Use it for:

- Building custom Azure Functions extensions that need to bind to Azure SDK types.
- Extending Azure Functions with new protocol handlers beyond standard HTTP.
- Integrating FastAPI or other frameworks as Azure Functions bindings.
- Adding support for Azure services (blob, Cosmos DB, Event Hubs, Service Bus) as function triggers or outputs.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Provides base infrastructure for Azure Functions Python extensions to recognize and bind to SDK types and HttpV2 types, enabling custom bindings and handlers.

Yes, but only as a transitive dependency of an extending package (e.g., azurefunctions-extensions-http-fastapi). Do not install directly; the library is not intended for standalone use. If an extending package requires it, installation is safe and low-friction.

## Install

pip install azurefunctions-extensions-base
uv add azurefunctions-extensions-base
poetry add azurefunctions-extensions-base

## Installing azurefunctions-extensions-base

Before you install: Low friction installation with no runtime dependencies. Actively maintained as of 2026-05-12, supporting current Python versions (3.10–3.13).

License in practice: MIT License permits free use, modification, and distribution with minimal restrictions, making it suitable for both open and closed projects.

Quickstart:

pip install azurefunctions-extensions-base

# This is a base library; import and use via extending packages:
# from azurefunctions_extensions_http_fastapi import ...
# from azurefunctions_extensions_bindings_blob import ...

Intended for use only through extending packages (e.g., azurefunctions-extensions-http-fastapi, azurefunctions-extensions-bindings-blob); direct use is not supported.

Verify before relying:

- Whether this package is safe to install alongside other Azure Functions extension packages without version conflicts.
- What specific SDK types and HttpV2 types are supported by this base version.

## Package facts

- License: MIT License (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 80.6K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

azure functions python extensions, azure functions binding base, python function app extensions, azure functions sdk types, azure functions custom bindings, azure-functions, extension-framework

[View on SkillFed](https://skillfed.io/packages/azurefunctions-extensions-base) · [View on PyPI](https://pypi.org/project/azurefunctions-extensions-base/)