---
id: microsoft-kiota-serialization-multipart
version: "1.11.9"
license: unclear
license_treatment: permissive
maintenance: active
---

# microsoft-kiota-serialization-multipart — Core abstractions for kiota generated libraries in Python

License: permissive · Maintenance: active · Downloads: 9.4M/mo

## What it is and what it does

This is a specialized serialization library for the Kiota SDK framework, a Microsoft tool for generating strongly-typed API client code from OpenAPI specifications. It provides the Python implementation of multipart/form-data encoding, which is needed when Kiota-generated clients need to send file uploads or complex form data to API endpoints that accept multipart payloads.

The package is a thin, focused layer that sits between Kiota-generated code and the underlying HTTP transport. It depends only on microsoft-kiota-abstractions and requires Python 3.10 or later. It's actively maintained and carries no known security vulnerabilities. You install it as a dependency of a Kiota-generated project, not typically as a standalone tool.

Use it for:

- Sending file uploads through a Kiota-generated Microsoft Graph API client.
- Encoding form fields with file attachments in generated API clients for OpenAPI-defined endpoints.
- Building Kiota-generated clients that interact with APIs requiring multipart/form-data request bodies.
- Handling mixed binary and text data in API requests generated from OpenAPI specifications.

## Worth the install?

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

Handles multipart/form-data serialization for Kiota-generated API client libraries, enabling them to send multipart payloads to supporting API endpoints.

Yes, if you are using a Kiota-generated Python client that needs to send multipart payloads. Install it as a dependency of your generated client project rather than directly. It has low friction, active maintenance, no vulnerabilities, and a permissive license. If your generated client does not use multipart endpoints, you do not need it.

## Install

pip install microsoft-kiota-serialization-multipart
uv add microsoft-kiota-serialization-multipart
poetry add microsoft-kiota-serialization-multipart

## Installing microsoft-kiota-serialization-multipart

Before you install: Low install friction with a single runtime dependency. Active maintenance as of 2026-08-14 with no known vulnerabilities.

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

Quickstart:

pip install microsoft-kiota-serialization-multipart

from microsoft_kiota_serialization_multipart import MultipartSerializationWriterFactory

Requires Python 3.10 or later.

Verify before relying:

- Whether this package is required only for APIs that explicitly use multipart endpoints, or if it's a universal dependency for all Kiota-generated clients.
- Performance characteristics when handling large multipart payloads or many concurrent serialization operations.

## Package facts

- License: not declared (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 9.4M/month (top 5,000 on PyPI)
- Known vulnerabilities: none known

## Tags

multipart form data serialization, kiota multipart serialization, api client multipart payload, form data encoding python, kiota generated client library, api-client-generation, serialization

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