codefmt: code formatter and linter by codefmt

format and lint javascript, python, and hubl in zapier, n8n, pipedream, make, and hubspot editors. powered by biome and ruff.

Available on Firefox for Android™

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About this extension

SUMMARY:

Lint and format JavaScript, Python, and HubL directly inside your automation tool's built-in development window, backed by Ruff and Biome.

DETAILS:

Clean up and check your code right inside automation workflows without needing to bounce over to VS Code or any other editor.

Supported environments:

Zapier (using Code by Zapier steps for Python and JavaScript)
n8n (for JavaScript and Python code blocks on n8n.cloud, n8n.io, or self-hosted instances)
Pipedream (JavaScript and Python code actions)
Make (JavaScript modules)
HubSpot Data Hub (custom Python and JavaScript code blocks)
HubSpot Design Manager / CMS (HubL templates featuring HTML/CSS blocks alongside module.js)

Workflow:

Launch any code workspace on a compatible service.
Trigger formatting using any of these three methods:
Click the browser extension toolbar icon for codefmt and choose "format code" to see all lint errors directly in the menu.
Use the right-click context menu and choose "Format with codefmt" (pure formatting) or "Fix with codefmt" (formatting, safe lint repairs, and import sorting).
Hit Ctrl+Shift+F (or the Mac equivalent) while focused inside the editor.
The tool processes your text and updates the editor automatically.
A popup notification displays the top 3 lint warnings (prioritizing errors), showing the exact line number, rule violated, and message. Hover to pin the alert, or click/press Esc to dismiss it.

Core Capabilities:

Context-aware formatting tailored to each platform's specific execution structure (including handling of global variables, return habits, line lengths, and async envelopes)
Automatic detection of Python, JavaScript, and HubL (including nested HTML, CSS, and JS contexts within HubSpot CMS)
Rapid lint analysis driven by Ruff for Python and oxlint for JavaScript—both high-performance Rust utilities
JS and TS formatting powered by Biome, delivering Prettier-compatible styling
Python linting and formatting handled entirely by Ruff
HubL support via a bespoke template formatter designed for HubSpot CMS
Right-click "Fix with codefmt" action that cleans imports and resolves safe Biome linter warnings in a single sweep
Deep customization options: target print width, semicolon usage, quote types, trailing commas, bracket spacing, arrow function parentheses, JSX quote preferences, object property quoting, same-line brackets, and import organization
One-click settings sync via codefmt.dev. Manage preferences in your browser, apply them in the extension. Profiles are maintained independently per platform.
Global shortcut (Ctrl+Shift+F) active whenever your cursor is inside an editor field
Self-hosted n8n support: type your instance URL in the extension panel, and Firefox will prompt for targeted permission. Exact domain matching ensures that removing an entry immediately revokes its access.
Light and dark themes that inherit your operating system preference automatically
A dynamic tab badge displays "fmt" on active domains so you always know the tool is running
If Firefox permission is disabled or lost, the extension flags this with a "!" badge and provides an instant one-click remedy in the popup, eliminating guesswork
Fully compatible with CodeMirror (versions 5 and 6) and Monaco editors used across all supported platforms
Maximum file payload of 50 KB per formatting request
30-second timeout threshold equipped with automatic retries for temporary connection drops

Data Practices & Privacy:

Zero tracking, telemetry, cookies, or user accounts required
Formatting rules and preferences live exclusively in your local browser storage
Submitting code transmits it via HTTPS to codefmt.dev/api/format, where it is handled entirely in RAM and sent back cleaned up. No logs, database records, or third-party sharing occur.
Operation is strictly restricted to the listed automation domains (plus codefmt.dev solely for preference synchronization)
Complete policy statement available at: https://codefmt.dev/privacy

Safety Measures:

Built on Manifest V3 using minimal required permissions (scripting, storage, activeTab, contextMenus)
Only approved domains can initiate formatting requests
Incoming internal messages undergo strict origin and sender validation prior to any network activity
Strict Content Security Policy enforced across all extension windows
Zero remote code loading. Every script is bundled locally as plain, readable JavaScript with no obfuscation or build steps.

Under the Hood:

Biome (biomejs.dev): Rust-engineered, Prettier-aligned layout engine for JavaScript and TypeScript
oxlint (oxc.rs): Swift JavaScript checker sharing a familiar rule catalog
Ruff (astral.sh/ruff): High-speed Python linting and formatting suite relied on by major software projects

Resources:

Web-based interface: https://codefmt.dev
Support and background info: https://codefmt.dev/about
Privacy documentation: https://codefmt.dev/privacy

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Permissions and data

Required permissions:

Access your data for sites in the zapier.com domain
Access your data for sites in the n8n.io domain
Access your data for sites in the n8n.cloud domain
Access your data for sites in the pipedream.com domain
Access your data for sites in the hubspot.com domain
Access your data for sites in the make.com domain
Access your data for zapier.com
Access your data for n8n.io
Access your data for n8n.cloud
Access your data for pipedream.com
Access your data for hubspot.com
Access your data for make.com

Optional permissions:

Access your data for sites in the zapier.com domain
Access your data for sites in the n8n.io domain
Access your data for sites in the n8n.cloud domain
Access your data for sites in the pipedream.com domain
Access your data for sites in the hubspot.com domain
Access your data for sites in the make.com domain
Access your data for zapier.com
Access your data for n8n.io
Access your data for n8n.cloud
Access your data for pipedream.com
Access your data for hubspot.com
Access your data for make.com
Access your data for codefmt.dev

Required data collection, according to the developer:

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