Let Claude Code control Node.js debugger
Debugging is hard for LLMs, because they primarily depend on source code, and they don't have access to runtime state. I spent countless hours debugging code, and the only way I found LLMs useful for that, is to ask them to add log lines. That's annoying, because it pollutes my code and adds unnecessary diffs. So we made an MCP server that solve this problem. It gives MCP clients (like Claude Code) access to a NodeJS inspector, so they can: 1. set breakpoints 2. step in, step out, continue 3. fetch the current execution location 4. read console output 5. run JS using eval To try: 1. run a…
What it does
In the maker’s words, at launch
Debugging is hard for LLMs, because they primarily depend on source code, and they don't have access to runtime state. I spent countless hours debugging code, and the only way I found LLMs useful for that, is to ask them to add log lines. That's annoying, because it pollutes my code and adds unnecessary diffs. So we made an MCP server that solve this problem. It gives MCP clients (like Claude Code) access to a NodeJS inspector, so they can: 1. set breakpoints 2. step in, step out, continue 3. fetch the current execution location 4. read console output 5. run JS using eval To try: 1. run a Node JS server in debug mode ``` node --inspect <file.js> ``` or ``` NODE_OPTIONS="--inspect" npm run <command> ``` 2. add the MCP to Claude Code ``` claude mcp add nodejs-debugger npx @hyperdrive-eng/mcp-nodejs-debugger ``` 3. ask Claude Code to set breakpoints and read runtime state. ```` > I'm getting a runtime error in NodeJS. Please help me debug this error at runtime using the nodejs-debugger mcp. ``` Would appreciate feedback, however big or small! Github: https://github.com/hyperdrive-eng/mcp-nodejs-debugger
Does the same job
all alternatives →- DBDebugging Babel and Node done right2016 · ▲22
Requirement: - Excellent feedback during development - Debugging with source maps Method: I'm using these scripts in package.json. "scripts": { "di": "node-inspector -d=7000 -p=8000 --save-live-edit --hidden node_modules/", "ds1": "babel ./server -d ./build/server -s -w", "ds2": "nodemon --watch ./build/server --delay 100ms --debug=7000 ./build/server/main.js" }, Then run "npm run ds1; npm run ds2; npm run di" Why: I took some time to put this together, after navigating all the tools out there. I personally find this to be "correct". Thought I'd…
- ECEnable Claude to interactively debug your code2025 · github.com · ▲7
I participated in the Nvidia + Vercel 2 hour hackathon in SF tonight, and built something I've wanted, but hadn't tried building. I implemented an MCP Server and VS Code extension to allow Claude Desktop to place breakpoints, step through code, and execute expressions (assuming language support). So you can ask it a question that requires actually stepping through the code and now it can actually do that - check values for you, etc. It's _definitely_ not perfect. Have improvements? Please make a PR!
- FMFlowLens – MCP server for debugging with Claude CodeOct 2025 · magentic.ai · ▲6
Hi HN, We often run into this with coding agents like Claude Code: debugging turns into copy-pasting logs, writing long explanations, and sharing screenshots. FlowLens is an MCP server plus a Chrome extension that captures browser context (video, console, network, user actions, storage) and makes it available to MCP-compatible agents like Claude Code. You can try it here: https://magentic.ai/flowlens Any feedback—good, bad, or brutal—is welcome.
- DDDebugging data, not just code: Using Claude & Cursor with Kuzu MCP2025 · blog.kuzudb.com · ▲8
- IBI built VS Code extension for Node.js package management2022 · npm.kasper.io · ▲6
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