Content
# 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!
