What is the key difference between MCP Js and MCP Server Js?

MCP Js belongs to the Code Execution category with cloud HTTP/SSE execution, while MCP Server Js belongs to the Code Execution category with local stdio execution.

How do I install MCP Js or MCP Server Js in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are MCP Js and MCP Server Js free or paid?

MCP Js operates under a Free / Open Source model (API Key required). MCP Server Js operates under a BYOK (Pay Provider Direct) model (API Key required).

Which MCP server has more tools and community activity?

MCP Js lists 5 tools with 2 views and 57 GitHub stars. MCP Server Js lists 6 tools with 2 views and 46 GitHub stars.

Can I use both MCP Js and MCP Server Js together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

MCP Js vs MCP Server Js

In-depth architectural comparison of the MCP Js and MCP Server Js MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

MCP Js

Code Execution · Remote HTTP/SSE

Quality: 59/100 (Good) | Auth: API Key required

MCP Server Js

Code Execution · Local stdio

Quality: 48/100 (Fair) | Auth: API Key required

Verdict Summary: Choose MCP Js if you need specialized Code Execution tools running via a hosted cloud SSE transport. Choose MCP Server Js if your workspace requires Code Execution integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose MCP Js when:

You need dedicated capabilities in the Code Execution domain.
You prefer remote streaming HTTP/SSE transport architecture.
Your security boundary fits: API Key required (Free / Open Source).
You have access to required keys: MCP_V8_CONFIG.
Primary tools included: run_js, get_execution, get_execution_output.

Explore MCP Js Details

Choose MCP Server Js when:

You need dedicated capabilities in the Code Execution domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: API Key required (BYOK (Pay Provider Direct)).
You have access to required keys: YEPCODE_API_TOKEN.
Primary tools included: Polyglot support for JavaScript and Python tool implementations, Secure sandboxed code execution environment, Tool parameter definitions via JSON Schema.

Feature & Specification Comparison

Specification	MCP Js r33drichards Code Execution	MCP Server Js yepcode Code Execution
Summary	A Javascript code execution sandbox that uses v8 to isolate code to run AI generated javascript locally without fear. Supports heap snapshotting for persistent sessions.	Execute any LLM-generated code in a secure and scalable sandbox environment and create your own MCP tools using JavaScript or Python, with full support for NPM and PyPI packages
Category & Scope	Code Execution

Tools & Capabilities Breakdown

MCP Js Tools (5)

run_js

Stateful: queue execution → `{execution_id}`. Stateless: run and return `{output, error?}`.

get_execution

Poll status/result of an execution.

get_execution_output

Read paginated console output (line or byte).

cancel_execution

Terminate a running execution.

list_executions

List executions and their status.

MCP Server Js Tools (6)

Polyglot support for JavaScript and Python tool implementations

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

MCP Js Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "r33drichards-mcp-js": {
      "url": "http://localhost:8080/mcp"
    }
  }
}

MCP Server Js Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "yepcode-mcp-server-js": {
      "command": "npx",
      "args": [
        "-y",
        "@yepcode/mcp-server"
      ],
      "env": {
        "YEPCODE_API_TOKEN": "YOUR_YEPCODE_API_TOKEN_HERE"
      }
    }
  }
}

Frequently Asked Questions

MCP Js is categorized under Code Execution and uses a remote streaming HTTP/SSE transport. In contrast, MCP Server Js belongs to Code Execution using local stdio subprocess. Select MCP Js when you need capabilities focused on code execution and MCP Server Js when you require tools for code execution.

More alternatives to MCP Js More alternatives to MCP Server Js Code Execution category hub