Denoland Plugin for Claude Code

A Claude Code plugin for building modern Deno applications with Fresh, JSR, and Deno Deploy.

Current Version: 0.6.2

What This Plugin Does

This plugin teaches Claude modern Deno development practices:

• Prefer JSR over deno.land/x - The deprecated registry that many LLMs default to
• Use Deno's built-in tools - deno fmt, deno lint, deno test, deno doc
• Fresh framework patterns - Island architecture, Preact, Tailwind
• Deno Deploy workflow - The deno deploy CLI for deployment
• Sandbox SDK - Safe execution of untrusted code

Installation

First, add the marketplace:

/plugin marketplace add donjo/denoland

Then install the plugin:

# Install to user scope (default, available in all projects)
/plugin install denoland@donjo-denoland

# Or install to project scope (shared with team via git)
/plugin install denoland@donjo-denoland --scope project

# Or install to local scope (gitignored, just for you)
/plugin install denoland@donjo-denoland --scope local

Alternatively, use the interactive plugin manager by running /plugin in Claude Code.

For local development:

claude plugin link /path/to/denoland

What's Included

Skills (Automatic Knowledge)

Skills are applied automatically when Claude detects you're working in a Deno project.

Skill	Purpose
deno-guidance	Core best practices, JSR packages, Deno CLI workflow
deno-deploy	Deno Deploy deployment workflows
deno-frontend	Fresh framework, Preact components, Tailwind CSS
deno-sandbox	Sandbox SDK for safe code execution

Commands

Command	Purpose
/deno-init	Scaffold a new Deno project (Fresh, CLI, library, or API)
/deno-deploy	Deploy your app to Deno Deploy

Agent

Agent	Purpose
deno-expert	Specialized helper for Deno questions, code review, and debugging

Key Features

JSR Package Priority

This plugin ensures Claude recommends the right package sources:

// Preferred - JSR packages
import { serve } from "jsr:@std/http";

// Also good - npm packages (when no JSR alternative)
import express from "npm:express";

// Avoid - deprecated registry
import { serve } from "https://deno.land/std/http/server.ts"; // DON'T USE

Deno CLI Workflow

The plugin encourages using Deno's built-in tools:

deno fmt          # Format code
deno lint         # Lint for issues
deno test         # Run tests
deno doc <pkg>    # View package docs
deno add <pkg>    # Add dependencies
deno deploy       # Deploy to Deno Deploy

Fresh Development

Proper Fresh patterns with island architecture:

deno run -Ar jsr:@fresh/init    # Create project
deno task dev                    # Development (port 5173)
deno task build                  # Production build
deno deploy --prod               # Deploy

Documentation Resources

• Deno Documentation
• Deno Fundamentals
• Fresh Documentation
• JSR Registry
• Deno Deploy
• Deno Sandboxes

Contributing

This plugin is open source. Contributions welcome!

License

MIT