runjs

The only MCP server you need: let your LLM generate and safely execute JavaScript -- including fetch API calls, JSONPath ETL, built-in resiliencey, and secrets management (by CharlieDigital)

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  • Ask HN: What Are You Working On? (June 2025)
    156 projects | news.ycombinator.com | 29 Jun 2025
    https://github.com/CharlieDigital/runjs

    I wrote an MCP server in C#/.NET that let's LLMs safely generate an run JavaScript using the Jint interpreter.

    It includes a `fetch` analogue using `System.Net.HttpClient`, as well as `jsonpath-plus`, and a built-in secrets manager.

    The prime use case is working with HTTP REST APIs with an LLM. With this, you can let users safely generate and execute JavaScript in a sandbox.

  • Remote MCP Support in Claude Code
    9 projects | news.ycombinator.com | 22 Jun 2025
    I've been working on an MCP server[0] that let's LLMs safely and securely generate and execute JavaScript in a sandbox including using `fetch` to make API calls. It includes a built in secrets manager to prevent exposing secrets to the LLM.

    I think this unlocks a lot of use cases that require code execution without compromising security. Biggest one is that you can now ask the LLM to make API calls securely because the JS is run in a C# interpreter with constraints for memory, time, and statement limits with hidden secrets (e.g. API keys).

    The implementation is open source with sample client code in JS using Vercel AI SDK with a demo UI as well.

    [0] https://github.com/CharlieDigital/runjs

  • Show HN: RunJS – a C# MCP server to let LLMs generate and run JavaScript safely
    2 projects | news.ycombinator.com | 19 Jun 2025
  • A note from our sponsor - SaaSHub
    www.saashub.com | 14 Jul 2025
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7.3
20 days ago

CharlieDigital/runjs is an open source project licensed under MIT License which is an OSI approved license.

The primary programming language of runjs is C#.


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