JSR MCP

A Deno monorepo containing packages for JSR (JavaScript Registry) access:

• @wyattjoh/jsr - Core library for JSR API access

• @wyattjoh/jsr-mcp - Model Context Protocol (MCP) server for LLM integration

Features

• Search packages across the JSR registry

• Get package details, versions, and dependencies

• Manage scopes and package publishing

• Handle member invitations and permissions

• Access registry statistics and metadata

• Full authentication support for write operations

Related MCP server: mcp-run-python

Requirements

• Deno 2.x or later

• Network access to JSR API

• JSR API token for authenticated operations (optional)

Packages

@wyattjoh/jsr

Core library for accessing JSR API:

deno add @wyattjoh/jsr

import { getPackage, searchPackages } from "@wyattjoh/jsr";

const results = await searchPackages({ query: "react" });
const pkg = await getPackage("deno", "std");

See full documentation

@wyattjoh/jsr-mcp

MCP server for LLM integration:

# Run directly from JSR
deno run --allow-net --allow-env jsr:@wyattjoh/jsr-mcp

# Or install globally
deno install --global --allow-net --allow-env -n jsr-mcp jsr:@wyattjoh/jsr-mcp

For Claude Desktop app integration, add this to your claude_desktop_config.json:

{
  "mcpServers": {
    "jsr": {
      "command": "deno",
      "args": [
        "run",
        "--allow-net",
        "--allow-env",
        "jsr:@wyattjoh/jsr-mcp"
      ],
      "env": {
        "JSR_API_TOKEN": "your-api-token-here"
      }
    }
  }
}

Option 2: From Source

1. Clone this repository

2. Install dependencies:

   deno cache packages/*/mod.ts

3. Run the server:

   deno run --allow-net --allow-env packages/jsr-mcp/mod.ts

Available Tools

The MCP server provides 40 tools for comprehensive JSR access:

Package Operations

• jsr_search_packages - Search for packages

• jsr_get_package - Get package details

• jsr_get_package_version - Get specific version details

• jsr_list_package_versions - List all versions

• jsr_get_package_metadata - Get package metadata

• jsr_get_package_dependencies - Get dependencies

• jsr_get_package_score - Get package quality score

• jsr_get_package_dependents - Find dependent packages

• jsr_create_package - Create new package (requires auth)

• jsr_update_package - Update package (requires auth)

• jsr_delete_package - Delete package (requires auth)

Package Version Management

• jsr_create_package_version - Upload new version (requires auth)

• jsr_update_package_version - Update version, e.g., yank (requires auth)

Scope Management

• jsr_get_scope - Get scope details

• jsr_list_scope_packages - List packages in a scope

• jsr_create_scope - Create new scope (requires auth)

• jsr_update_scope - Update scope settings (requires auth)

• jsr_delete_scope - Delete scope (requires auth)

Member Management

• jsr_list_scope_members - List scope members

• jsr_add_scope_member - Invite member (requires auth)

• jsr_update_scope_member - Update member role (requires auth)

• jsr_remove_scope_member - Remove member (requires auth)

• jsr_list_scope_invites - List pending invites

• jsr_delete_scope_invite - Delete scope invite (requires auth)

• jsr_accept_scope_invite - Accept invite (requires auth)

• jsr_decline_scope_invite - Decline invite (requires auth)

User Operations

• jsr_get_current_user - Get authenticated user

• jsr_get_current_user_scopes - Get user's scopes

• jsr_get_current_user_scope_member - Get user's membership in a scope

• jsr_get_current_user_invites - Get user's pending invites

• jsr_get_user - Get user details

• jsr_get_user_scopes - Get user's scopes

Registry Operations

• jsr_list_packages - List all registry packages

• jsr_get_stats - Get registry statistics

Authorization (OAuth)

• jsr_create_authorization - Start authorization flow (requires auth)

• jsr_get_authorization_details - Get authorization details

• jsr_approve_authorization - Approve authorization (requires auth)

• jsr_deny_authorization - Deny authorization (requires auth)

• jsr_exchange_authorization - Exchange code for token (requires auth)

Publishing

• jsr_get_publishing_task - Get publishing task status

Example Usage

// Search for packages
jsr_search_packages({ query: "react", limit: 10 });

// Get package details
jsr_get_package({ scope: "deno", name: "std" });

// List versions with pagination
jsr_list_package_versions({
  scope: "deno",
  name: "std",
  limit: 20,
  page: 1,
});

// Get dependencies for a specific version
jsr_get_package_dependencies({
  scope: "deno",
  name: "std",
  version: "1.0.0",
});

// Create a new scope (requires authentication)
jsr_create_scope({
  scope: "my-org",
  description: "My organization's packages",
});

Security Notes

• Read operations do not require authentication

• Write operations require a valid JSR API token

• The server only accesses the JSR API endpoints

• No local file system access beyond reading environment variables

Development

This is a Deno workspace monorepo. All commands run from the root affect all packages.

# Clone the repository
git clone https://github.com/wyattjoh/jsr-mcp.git
cd jsr-mcp

# Cache dependencies
deno cache packages/*/mod.ts

# Format all code
deno fmt

# Lint all packages
deno lint

# Type check all packages
deno check packages/jsr/mod.ts packages/jsr-mcp/mod.ts

# Run tests
deno test --allow-net packages/

# Run MCP server locally (with watch mode)
deno run --allow-read --allow-write --allow-env --allow-run --allow-net --watch packages/jsr-mcp/mod.ts

# Run MCP server in production
deno run --allow-read --allow-write --allow-env --allow-run --allow-net packages/jsr-mcp/mod.ts

# Build binary
cd packages/jsr-mcp
deno compile --allow-read --allow-write --allow-env --allow-run --allow-net --output=jsr-mcp mod.ts

# Publish packages (CI/CD)
deno publish

Working on Individual Packages

# Work on @wyattjoh/jsr
cd packages/jsr
deno test --allow-net

# Work on @wyattjoh/jsr-mcp
cd packages/jsr-mcp
deno run --allow-net --allow-env mod.ts

License

MIT