Jsr Mcp

JSR MCP

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

• [@wyattjoh/jsr](packages/jsr) - Core library for JSR API access
• [@wyattjoh/jsr-mcp](packages/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

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](packages/jsr/README.md)

@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:

``bash deno cache packages/*/mod.ts ``

1. Run the server:

``bash 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

• jsrsearchpackages - Search for packages
• jsrgetpackage - Get package details
• jsrgetpackage_version - Get specific version details
• jsrlistpackage_versions - List all versions
• jsrgetpackage_metadata - Get package metadata
• jsrgetpackage_dependencies - Get dependencies
• jsrgetpackage_score - Get package quality score
• jsrgetpackage_dependents - Find dependent packages
• jsrcreatepackage - Create new package (requires auth)
• jsrupdatepackage - Update package (requires auth)
• jsrdeletepackage - Delete package (requires auth)

Package Version Management

• jsrcreatepackage_version - Upload new version (requires auth)
• jsrupdatepackage_version - Update version, e.g., yank (requires auth)

Scope Management

• jsrgetscope - Get scope details
• jsrlistscope_packages - List packages in a scope
• jsrcreatescope - Create new scope (requires auth)
• jsrupdatescope - Update scope settings (requires auth)
• jsrdeletescope - Delete scope (requires auth)

Member Management

• jsrlistscope_members - List scope members
• jsraddscope_member - Invite member (requires auth)
• jsrupdatescope_member - Update member role (requires auth)
• jsrremovescope_member - Remove member (requires auth)
• jsrlistscope_invites - List pending invites
• jsrdeletescope_invite - Delete scope invite (requires auth)
• jsracceptscope_invite - Accept invite (requires auth)
• jsrdeclinescope_invite - Decline invite (requires auth)

User Operations

• jsrgetcurrent_user - Get authenticated user
• jsrgetcurrentuserscopes - Get user's scopes
• jsrgetcurrentuserscope_member - Get user's membership in a scope
• jsrgetcurrentuserinvites - Get user's pending invites
• jsrgetuser - Get user details
• jsrgetuser_scopes - Get user's scopes

Registry Operations

• jsrlistpackages - List all registry packages
• jsrgetstats - Get registry statistics

Authorization (OAuth)

• jsrcreateauthorization - Start authorization flow (requires auth)
• jsrgetauthorization_details - Get authorization details
• jsrapproveauthorization - Approve authorization (requires auth)
• jsrdenyauthorization - Deny authorization (requires auth)
• jsrexchangeauthorization - Exchange code for token (requires auth)

Publishing

• jsrgetpublishing_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

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: wyattjoh
• Source: wyattjoh/jsr-mcp
• License: MIT

Install and usage instructions live in the source repository linked above.