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Code Execution MCP Server

MCP Js

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.

Scan found nothing by r33drichards380BSDRustIntermediatestdio
View on GitHub Install Guide

Install

No auto-install command available for this server.

Check the GitHub repository for setup instructions

Safety Report

83% Scan found nothing
Scanned 5 months ago
5 passed 1 warnings
Security
Authentication
details

Authentication detected: bearer_check, auth_header, jwt_verify, oauth

Pass
CORS Policy
details

No CORS-relevant transport detected (likely stdio)

N/A
Rate Limiting
details

No rate limiting mechanism detected

Info
Known CVEs
details

No known CVEs in dependencies

Pass
Code Quality
Dependency Audit
details

No known vulnerable dependencies detected

Pass
Dangerous Patterns
details

No dangerous code patterns detected

Pass
License
details

License: 0BSD

Pass
Community
Maintenance Status
details

Last commit 5 months ago

Warning

Learn about our security methodology →

Frequently Asked Questions

What is MCP Js?

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.

Is MCP Js safe to use?

We cannot tell you that, and nobody scanning at this scale can. What we did in March 2026 was shallow-clone MCP Js and run five keyword searches over its source: auth identifiers, CORS configuration, rate-limit identifiers, the dependency manifest against a hardcoded list of 18 known-vulnerable packages, and unguarded eval/exec calls. None of them matched. A text search cannot follow a variable, judge intent, or tell you what a server does once it is running, so "nothing matched" is not "safe". What the scan does and does not cover is written out at /mcp/security.

What are alternatives to MCP Js?

Similar MCP servers include Serena, MCP Run Python, DesktopCommanderMCP. Each serves a similar purpose but may differ in features, language, and compatibility.

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