---
id: jupyterlab-code-formatter
version: "3.1.0"
license: Copyright 2023 Ryan TAM Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software… (full text in the JSON record)
license_treatment: permissive
maintenance: active
---

# jupyterlab-code-formatter — A JupyterLab plugin to facilitate invocation of code formatters.

License: permissive · Maintenance: active · Downloads: 126.2K/mo

## What it is and what it does

This is a JupyterLab extension that brings code formatting capabilities directly into your notebook environment. It acts as a bridge between JupyterLab and external code formatters, letting you format code cells without leaving the notebook. The plugin consists of a server-side Python component and a frontend component that together add formatting controls to the JupyterLab interface.

Once installed and configured, you invoke formatters on demand through the UI rather than running them separately in a terminal. It's designed for developers who want to maintain code style consistency within their notebooks without manual formatting or context-switching. The plugin supports Python 3.10 through 3.14 and integrates with jupyter-server and packaging as its core dependencies.

Use it for:

- Format Python code cells in notebooks to match your project's style guide without leaving JupyterLab.
- Quickly clean up messy or auto-generated code in exploratory notebooks before sharing or committing.
- Enforce consistent code style across a team's collaborative notebooks through configured formatters.
- Integrate code formatting into a notebook-based data science or research workflow.
- Configure different formatters for different projects through the plugin's configuration system.

## Worth the install?

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

A JupyterLab plugin that integrates code formatters directly into the notebook interface, allowing you to format code cells with a single action.

Yes. The plugin is actively maintained, has low install friction, carries no known vulnerabilities, and solves a real friction point for notebook users. The MIT license is permissive. Install it if you regularly work in JupyterLab and want in-notebook formatting without context-switching—just remember to restart JupyterLab after setup and install your preferred formatters separately.

## Install

pip install jupyterlab-code-formatter
uv add jupyterlab-code-formatter
poetry add jupyterlab-code-formatter

## Installing jupyterlab-code-formatter

Before you install: Low friction install with a pure-Python wheel. Actively maintained with a recent release 8 days ago. Requires jupyter-server and packaging as runtime dependencies, both standard in Jupyter environments.

License in practice: MIT license (permissive). You can use, modify, and distribute this plugin freely with minimal restrictions, making it suitable for both personal and commercial projects.

Quickstart:

pip install jupyterlab-code-formatter
# Install your preferred code formatters separately
# Restart JupyterLab
# Format controls now appear in the notebook interface

Requires JupyterLab to be restarted after installation for the plugin to become active.

Verify before relying:

- Which specific code formatters are supported and how to configure them.
- Performance impact when formatting very large notebooks or code cells.
- Whether the plugin works with all JupyterLab 4 versions or only specific minor releases.

## Package facts

- License: Copyright 2023 Ryan TAM Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software… (full text in the JSON record) (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 126.2K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

jupyterlab code formatter plugin, format code in jupyter notebooks, code formatting jupyterlab extension, automatic code formatter jupyter, notebook code beautifier, jupyter formatting tools, jupyterlab extension formatting, jupyter-extension, code-formatting, developer-tools

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