jupyterlab-code-formatter
A JupyterLab plugin to facilitate invocation of code formatters.
Decision gist · record as of 2026-08-14
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.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires JupyterLab to be restarted after installation for the plugin to become active.
- Low friction install with a pure-Python wheel.
- Actively maintained with a recent release 8 days ago.
License · maintenance · safety
permissive license (permissive) — MIT license (permissive). You can use, modify, and distribute this plugin freely with minimal restrictions, making it suitable for both personal and commercial projects.
last release 2026-08-06 (8 days) · last repo commit 2026-08-07 · 906 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 126,160 downloads/mo, #11,788 on PyPI
Alternatives
Verify before relying
pip install jupyterlab-code-formatter
# Install your preferred code formatters separately
# Restart JupyterLab
# Format controls now appear in the notebook interface- 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.
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 on this page. Verify before relying on it.
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
jupyterlab-code-formatter on PyPI
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.
Requires JupyterLab to be restarted after installation for the plugin to become active.
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 interfaceVerify 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 | permissive license permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 2 packagesjupyter-serverpackaging |
| Maintenance | Actively maintained 8 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 126,160 / month, #11,788 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Framework :: JupyterFramework :: Jupyter :: JupyterLabFramework :: Jupyter :: JupyterLab :: 4Framework :: Jupyter :: JupyterLab :: ExtensionsFramework :: Jupyter :: JupyterLab :: Extensions :: PrebuiltLicense :: OSI Approved :: BSD LicenseProgramming Language :: PythonProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14 |
Evidence: jupyterlab_code_formatter-3.1.0-py3-none-any.whl
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