---
id: fastapi-slim
version: "0.129.1"
license: MIT
license_treatment: permissive
maintenance: active
---

# fastapi-slim — FastAPI framework, high performance, easy to learn, fast to code, ready for production

License: permissive · Maintenance: active · Downloads: 83.4K/mo

## What it is and what it does

fastapi-slim is a deprecated shim package that does nothing except depend on fastapi. It was created as a migration path for projects that historically depended on fastapi-slim when that was a separate distribution, but all functionality has since been integrated into fastapi itself. The package is no longer maintained and will receive no updates.

The package's own documentation explicitly warns against installing it and directs users to install fastapi directly instead. It exists solely as a compatibility layer for legacy projects that have not yet updated their dependency declarations.

Use it for:

- Updating legacy projects that declared fastapi-slim as a dependency to migrate them to the current fastapi package
- Temporary compatibility bridge during a codebase migration from fastapi-slim to fastapi
- Understanding why fastapi-slim exists and why it should be removed from your project

## Worth the install?

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

This package is a deprecated migration shim that depends solely on fastapi; it exists only to redirect old projects and should not be installed.

No. Do not install this package. The package's own documentation explicitly states 'You should not install this package' and directs you to install fastapi instead. It is deprecated, will receive no updates, and serves no purpose except as a migration aid for projects that have not yet updated their dependencies.

## Install

pip install fastapi-slim
uv add fastapi-slim
poetry add fastapi-slim

## Installing fastapi-slim

Before you install: Low install friction, but maintenance status is moot: the package is explicitly deprecated and will receive no further updates. Its only purpose is to redirect old projects to fastapi itself.

License in practice: MIT license permits free use and modification, but this is irrelevant since the package is deprecated and should not be installed.

Quickstart:

# Do not use this package.
# Install fastapi instead:
# pip install fastapi

# If you currently have fastapi-slim in your requirements,
# replace it with:
# pip install fastapi

This package is deprecated and should not be installed; use fastapi directly instead.

Verify before relying:

- Whether any real projects still depend on fastapi-slim and would break if it were removed from PyPI

## Package facts

- License: MIT (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 83.4K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

fastapi slim deprecated, fastapi migration path, fastapi shim package, fastapi legacy redirect, do not install fastapi slim, deprecated, migration-shim

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