Code Runner

# Code Runner MCP Server [](https://www.npmjs.com/package/mcp-server-code-runner) [](https://smithery.ai/server/@formulahendry/mcp-server-code-runner) [](https://hub.docker.com/r/formulahendry/mcp-server-code-runner) MCP Server for running code snippet and show the result. It supports running multiple programming languages: **JavaScript, PHP, Python, Perl, Perl 6, Ruby, Go, Lua, Groovy, PowerShell, BAT/CMD, BASH/SH, F# Script, C# Script, VBScript, TypeScript, CoffeeScript, Scala, Swift, Julia, Crystal, OCaml Script, R, AppleScript, Elixir, Clojure, Racket, Scheme, AutoHotkey, AutoIt, Kotlin Script, Dart, Haskell, Ni, Lisp, Kit, V, SCSS, Sass**. Full list could be seen here in [constants.ts](https://github.com/formulahendry/mcp-server-code-runner/blob/main/src/constants.ts). <a href="https://glama.ai/mcp/servers/d3mluq4vy9"> <img width="380" height="200" src="https://glama.ai/mcp/servers/d3mluq4vy9/badge" alt="mcp-server-code-runner MCP server" /> </a> ## Setup ### npx for VS Code Install the Code Runner MCP server in VS Code using below buttons: [-VS_Code-0098FF)](https://vscode.dev/redirect?url=vscode%3Amcp%2Finstall%3F%257B%2522name%2522%253A%2522mcp-server-code-runner%2522%252C%2522command%2522%253A%2522npx%2522%252C%2522args%2522%253A%255B%2522-y%2522%252C%2522mcp-server-code-runner%2540latest%2522%255D%257D) [-VS_Code_Insiders-24bfa5)](https://insiders.vscode.dev/redirect?url=vscode-insiders%3Amcp%2Finstall%3F%257B%2522name%2522%253A%2522mcp-server-code-runner%2522%252C%2522command%2522%253A%2522npx%2522%252C%2522args%2522%253A%255B%2522-y%2522%252C%2522mcp-server-code-runner%2540latest%2522%255D%257D) Alternatively, you can add configuration in `settings.json`: ```json { "mcp": { "inputs": [], "servers": { "mcp-server-code-runner": { "command": "npx", "args": [ "-y", "mcp-server-code-runner@latest" ], } } } } ``` ### npx for Claude Desktop Configuration in `claude_desktop_config.json`: ```json { "mcpServers": { "mcp-server-code-runner": { "command": "npx", "args": [ "-y", "mcp-server-code-runner@latest" ], } } } ``` ### Docker Use VS Code as example. Install the Code Runner MCP server in VS Code using below buttons: [-VS_Code-0098FF)](https://vscode.dev/redirect?url=vscode%3Amcp%2Finstall%3F%257B%2522name%2522%253A%2522mcp-server-code-runner%2522%252C%2522command%2522%253A%2522docker%2522%252C%2522args%2522%253A%255B%2522run%2522%252C%2522--rm%2522%252C%2522-i%2522%252C%2522formulahendry%252Fmcp-server-code-runner%2522%255D%257D) [-VS_Code_Insiders-24bfa5)](https://insiders.vscode.dev/redirect?url=vscode-insiders%3Amcp%2Finstall%3F%257B%2522name%2522%253A%2522mcp-server-code-runner%2522%252C%2522command%2522%253A%2522docker%2522%252C%2522args%2522%253A%255B%2522run%2522%252C%2522--rm%2522%252C%2522-i%2522%252C%2522formulahendry%252Fmcp-server-code-runner%2522%255D%257D) Alternatively, you can add configuration in `settings.json`: ```json { "mcp": { "inputs": [], "servers": { "mcp-server-code-runner": { "command": "docker", "args": [ "run", "--rm", "-i", "formulahendry/mcp-server-code-runner" ] } } } } ``` ### npx issue on Widnows On Windows, [MCP servers may fail to connect with `npx`](https://github.com/modelcontextprotocol/servers/issues/40). You could try below two workarounds: #### use bunx 1. Install [Bun](https://bun.sh/docs/installation). 2. In configuration, change `npx` with `bunx`. #### use cmd Below is VS Code configuration in `settings.json`: ```json { "mcp": { "inputs": [], "servers": { "mcp-server-code-runner": { "command": "cmd", "args": [ "/c", "npx", "-y", "mcp-server-code-runner@latest" ], } } } } ``` ## Run with [Streamable HTTP Transport](https://modelcontextprotocol.io/specification/2025-03-26/basic/transports#streamable-http) ```shell npm install -g mcp-server-code-runner@latest mcp-server-code-runner --transport http ``` ## Usage Before using Code Runner MCP Server, please make sure interpreter or compiler of the programming language you want to run is set in `PATH` environment variable. Try below prompts in the application which has configured Code Runner MCP Server: * `Run the JavaScript Code: console.log(5+6)` * `Where is temporary folder in my OS? Use run-code tool` * `How many CPUs do I have in my machine? Use run-code tool`   ## Build your own MCP Server Want to build your own MCP Server? Try [Yeoman Generator for MCP Server](https://www.npmjs.com/package/generator-mcp) to create your MCP Server project!