Development & Testing

Node.js Debugging

Debug Node.js applications with the built-in inspector, breakpoints, and memory profiling tools.

Claude Code Codex Cursor Copilot Windsurf

Overview

Node.js includes a powerful built-in debugger that supports breakpoints, step-through execution, variable inspection, and memory profiling. AI agents can help you configure launch configurations, set conditional breakpoints, analyze heap snapshots, and identify memory leaks or performance bottlenecks in your application.

Your AI agent can start Node.js in inspect mode (node --inspect), configure VS Code launch.json for debugging, attach to running processes, and interpret the output of profiling tools. The agent can also help you use the --inspect-brk flag to pause at the first line, making it easy to debug startup issues in complex applications.

For production debugging, your agent can configure Node.js diagnostic reports, analyze core dumps, and set up logging strategies that provide the right level of detail. It can also help with CPU profiling using node --prof, heap snapshot analysis for memory leaks, and event loop utilization monitoring to identify blocking operations.

Who Is This For?

Backend developers diagnosing complex bugs with breakpoints and step-through debugging
Engineers profiling memory usage and identifying memory leaks
Developers debugging startup issues in complex Node.js applications
Teams setting up VS Code launch configurations for multi-service debugging

Installation

Setup for Claude Code

node --inspect src/server.js
Claude Code can analyze debug output and suggest fixes

Configuration

// .vscode/launch.json
{
  "version": "0.2.0",
  "configurations": [
    {
      "type": "node",
      "request": "launch",
      "name": "Debug Server",
      "program": "${workspaceFolder}/src/server.ts",
      "preLaunchTask": "tsc: build",
      "outFiles": ["${workspaceFolder}/dist/**/*.js"],
      "console": "integratedTerminal"
    }
  ]
}