JSR MCP
A Model Context Protocol server enabling full JSR registry access and LLM integration.
Key Features
Use Cases
README
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
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");
@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
- Clone this repository
- Install dependencies:
bash
deno cache packages/*/mod.ts - 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
- 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
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Repository Owner
User
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