Debug Dashboard<\/title> <style> body { font-family: monospace; background: #1e1e1e; color: #d4d4d4; } .container { max-width: 1200px; margin: 0 auto; padding: 20px; } .metric { background: #252526; padding: 15px; margin: 10px 0; border-radius: 5px; } .metric h3 { margin: 0 0 10px 0; color: #569cd6; } .chart { height: 200px; background: #1e1e1e; margin: 10px 0; } .log-entry { padding: 5px; border-bottom: 1px solid #3e3e3e; } .error { color: #f44747; } .warn { color: #ff9800; } .info { color: #4fc3f7; } .debug { color: #4caf50; } <\/style> <\/head> <body> <div class="container"> <h1>Debug Dashboard<\/h1> <div class="metric"> <h3>System Metrics<\/h3> <div id="metrics"><\/div> <\/div> <div class="metric"> <h3>Memory Usage<\/h3> <canvas id="memoryChart" class="chart"><\/canvas> <\/div> <div class="metric"> <h3>Request Traces<\/h3> <div id="traces"><\/div> <\/div> <div class="metric"> <h3>Debug Logs<\/h3> <div id="logs"><\/div> <\/div> <\/div> <script> \/\/ WebSocket connection for real-time updates const ws = new WebSocket('ws:\/\/localhost:9231\/debug'); ws.onmessage = (event) => { const data = JSON.parse(event.data); switch (data.type) { case 'metrics': updateMetrics(data.payload); break; case 'trace': addTrace(data.payload); break; case 'log': addLog(data.payload); break; } }; function updateMetrics(metrics) { const container = document.getElementById('metrics'); container.innerHTML = ` <div>CPU: ${metrics.cpu.percent}%<\/div> <div>Memory: ${metrics.memory.used}MB \/ ${metrics.memory.total}MB<\/div> <div>Uptime: ${metrics.uptime}s<\/div> <div>Active Requests: ${metrics.activeRequests}<\/div> `; } function addTrace(trace) { const container = document.getElementById('traces'); const entry = document.createElement('div'); entry.className = 'log-entry'; entry.innerHTML = ` <span>${trace.timestamp}<\/span> <span>${trace.method} ${trace.path}<\/span> <span>${trace.duration}ms<\/span> <span>${trace.status}<\/span> `; container.insertBefore(entry, container.firstChild); } function addLog(log) { const container = document.getElementById('logs'); const entry = document.createElement('div'); entry.className = `log-entry ${log.level}`; entry.innerHTML = ` <span>${log.timestamp}<\/span> <span>[${log.level.toUpperCase()}]<\/span> <span>${log.message}<\/span> `; container.insertBefore(entry, container.firstChild); \/\/ Keep only last 100 logs while (container.children.length > 100) { container.removeChild(container.lastChild); } } \/\/ Memory usage chart const memoryChart = document.getElementById('memoryChart').getContext('2d'); const memoryData = []; function updateMemoryChart(usage) { memoryData.push({ time: new Date(), value: usage, }); \/\/ Keep last 50 points if (memoryData.length > 50) { memoryData.shift(); } \/\/ Draw chart \/\/ ... chart drawing logic } <\/script> <\/body> <\/html> ``` ### 10. IDE Integration Configure IDE debugging features: **IDE Debug Extensions** ```json \/\/ .vscode\/extensions.json { "recommendations": [ "ms-vscode.vscode-js-debug", "msjsdiag.debugger-for-chrome", "ms-vscode.vscode-typescript-tslint-plugin", "dbaeumer.vscode-eslint", "ms-azuretools.vscode-docker", "humao.rest-client", "eamodio.gitlens", "usernamehw.errorlens", "wayou.vscode-todo-highlight", "formulahendry.code-runner" ] } \/\/ .vscode\/tasks.json { "version": "2.0.0", "tasks": [ { "label": "Start Debug Server", "type": "npm", "script": "debug", "problemMatcher": [], "presentation": { "reveal": "always", "panel": "dedicated" } }, { "label": "Profile Application", "type": "shell", "command": "node --inspect-brk --cpu-prof --cpu-prof-dir=.\/profiles ${workspaceFolder}\/src\/index.js", "problemMatcher": [] }, { "label": "Memory Snapshot", "type": "shell", "command": "node --inspect --expose-gc ${workspaceFolder}\/scripts\/heap-snapshot.js", "problemMatcher": [] } ] } ``` ## Output Format 1. **Debug Configuration**: Complete setup for all debugging tools 2. **Integration Guide**: Step-by-step integration instructions 3. **Troubleshooting Playbook**: Common debugging scenarios and solutions 4. **Performance Baselines**: Metrics for comparison 5. **Debug Scripts**: Automated debugging utilities 6. **Dashboard Setup**: Real-time debugging interface 7. **Documentation**: Team debugging guidelines 8. **Emergency Procedures**: Production debugging protocols Focus on creating a comprehensive debugging environment that enhances developer productivity and enables rapid issue resolution in all environments.</article></body></html>

--- name: distributed-debugging-debug-trace description: "You are a debugging expert specializing in setting up comprehensive debugging environments, distributed tracing, and diagnostic tools. Configure debugging workflows, implement tracing solutions, and e" --- # Debug and Trace Configuration You are a debugging expert specializing in setting up comprehensive debugging environments, distributed tracing, and diagnostic tools. Configure debugging workflows, implement tracing solutions, and establish troubleshooting practices for development and production environments. ## Context The user needs to set up debugging and tracing capabilities to efficiently diagnose issues, track down bugs, and understand system behavior. Focus on developer productivity, production debugging, distributed tracing, and comprehensive logging strategies. ## Requirements $ARGUMENTS ## Instructions ### 1. Development Environment Debugging Set up comprehensive debugging environments: **VS Code Debug Configuration** ```json \/\/ .vscode\/launch.json { "version": "0.2.0", "configurations": [ { "name": "Debug Node.js App", "type": "node", "request": "launch", "runtimeExecutable": "node", "runtimeArgs": ["--inspect-brk", "--enable-source-maps"], "program": "${workspaceFolder}\/src\/index.js", "env": { "NODE_ENV": "development", "DEBUG": "*", "NODE_OPTIONS": "--max-old-space-size=4096" }, "sourceMaps": true, "resolveSourceMapLocations": [ "${workspaceFolder}\/**", "!**\/node_modules\/**" ], "skipFiles": [ "\/**", "node_modules\/**" ], "console": "integratedTerminal", "outputCapture": "std" }, { "name": "Debug TypeScript", "type": "node", "request": "launch", "program": "${workspaceFolder}\/src\/index.ts", "preLaunchTask": "tsc: build - tsconfig.json", "outFiles": ["${workspaceFolder}\/dist\/**\/*.js"], "sourceMaps": true, "smartStep": true, "internalConsoleOptions": "openOnSessionStart" }, { "name": "Debug Jest Tests", "type": "node", "request": "launch", "program": "${workspaceFolder}\/node_modules\/.bin\/jest", "args": [ "--runInBand", "--no-cache", "--watchAll=false", "--detectOpenHandles" ], "console": "integratedTerminal", "internalConsoleOptions": "neverOpen", "env": { "NODE_ENV": "test" } }, { "name": "Attach to Process", "type": "node", "request": "attach", "processId": "${command:PickProcess}", "protocol": "inspector", "restart": true, "sourceMaps": true } ], "compounds": [ { "name": "Full Stack Debug", "configurations": ["Debug Backend", "Debug Frontend"], "stopAll": true } ] } ``` **Chrome DevTools Configuration** ```javascript \/\/ debug-helpers.js class DebugHelper { constructor() { this.setupDevTools(); this.setupConsoleHelpers(); this.setupPerformanceMarkers(); } setupDevTools() { if (typeof window !== 'undefined') { \/\/ Add debug namespace window.DEBUG = window.DEBUG || {}; \/\/ Store references to important objects window.DEBUG.store = () => window.__REDUX_STORE__; window.DEBUG.router = () => window.__ROUTER__; window.DEBUG.components = new Map(); \/\/ Performance debugging window.DEBUG.measureRender = (componentName) => { performance.mark(`${componentName}-start`); return () => { performance.mark(`${componentName}-end`); performance.measure( componentName, `${componentName}-start`, `${componentName}-end` ); }; }; \/\/ Memory debugging window.DEBUG.heapSnapshot = async () => { if ('memory' in performance) { const snapshot = await performance.measureUserAgentSpecificMemory(); console.table(snapshot); return snapshot; } }; } } setupConsoleHelpers() { \/\/ Enhanced console logging const styles = { error: 'color: #ff0000; font-weight: bold;', warn: 'color: #ff9800; font-weight: bold;', info: 'color: #2196f3; font-weight: bold;', debug: 'color: #4caf50; font-weight: bold;', trace: 'color: #9c27b0; font-weight: bold;' }; Object.entries(styles).forEach(([level, style]) => { const original = console[level]; console[level] = function(...args) { if (process.env.NODE_ENV === 'development') { const timestamp = new Date().toISOString(); original.call(console, `%c[${timestamp}] ${level.toUpperCase()}:`, style, ...args); } }; }); } } \/\/ React DevTools integration if (process.env.NODE_ENV === 'development') { \/\/ Expose React internals window.__REACT_DEVTOOLS_GLOBAL_HOOK__ = { ...window.__REACT_DEVTOOLS_GLOBAL_HOOK__, onCommitFiberRoot: (id, root) => { \/\/ Custom commit logging console.debug('React commit:', root); } }; } ``` ### 2. Remote Debugging Setup Configure remote debugging capabilities: **Remote Debug Server** ```javascript \/\/ remote-debug-server.js const inspector = require('inspector'); const WebSocket = require('ws'); const http = require('http'); class RemoteDebugServer { constructor(options = {}) { this.port = options.port || 9229; this.host = options.host || '0.0.0.0'; this.wsPort = options.wsPort || 9230; this.sessions = new Map(); } start() { \/\/ Open inspector inspector.open(this.port, this.host, true); \/\/ Create WebSocket server for remote connections this.wss = new WebSocket.Server({ port: this.wsPort }); this.wss.on('connection', (ws) => { const sessionId = this.generateSessionId(); this.sessions.set(sessionId, ws); ws.on('message', (message) => { this.handleDebugCommand(sessionId, message); }); ws.on('close', () => { this.sessions.delete(sessionId); }); \/\/ Send initial session info ws.send(JSON.stringify({ type: 'session', sessionId, debugUrl: `chrome-devtools:\/\/devtools\/bundled\/inspector.html?ws=${this.host}:${this.port}` })); }); console.log(`Remote debug server listening on ws:\/\/${this.host}:${this.wsPort}`); } handleDebugCommand(sessionId, message) { const command = JSON.parse(message); switch (command.type) { case 'evaluate': this.evaluateExpression(sessionId, command.expression); break; case 'setBreakpoint': this.setBreakpoint(command.file, command.line); break; case 'heapSnapshot': this.takeHeapSnapshot(sessionId); break; case 'profile': this.startProfiling(sessionId, command.duration); break; } } evaluateExpression(sessionId, expression) { const session = new inspector.Session(); session.connect(); session.post('Runtime.evaluate', { expression, generatePreview: true, includeCommandLineAPI: true }, (error, result) => { const ws = this.sessions.get(sessionId); if (ws) { ws.send(JSON.stringify({ type: 'evaluateResult', result: result || error })); } }); session.disconnect(); } } \/\/ Docker remote debugging setup FROM node:18 RUN apt-get update && apt-get install -y \ chromium \ gdb \ strace \ tcpdump \ vim EXPOSE 9229 9230 ENV NODE_OPTIONS="--inspect=0.0.0.0:9229" CMD ["node", "--inspect-brk=0.0.0.0:9229", "index.js"] ``` ### 3. Distributed Tracing Implement comprehensive distributed tracing: **OpenTelemetry Setup** ```javascript \/\/ tracing.js const { NodeSDK } = require('@opentelemetry\/sdk-node'); const { getNodeAutoInstrumentations } = require('@opentelemetry\/auto-instrumentations-node'); const { Resource } = require('@opentelemetry\/resources'); const { SemanticResourceAttributes } = require('@opentelemetry\/semantic-conventions'); const { JaegerExporter } = require('@opentelemetry\/exporter-jaeger'); const { BatchSpanProcessor } = require('@opentelemetry\/sdk-trace-base'); class TracingSystem { constructor(serviceName) { this.serviceName = serviceName; this.sdk = null; } initialize() { const jaegerExporter = new JaegerExporter({ endpoint: process.env.JAEGER_ENDPOINT || 'http:\/\/localhost:14268\/api\/traces', }); const resource = Resource.default().merge( new Resource({ [SemanticResourceAttributes.SERVICE_NAME]: this.serviceName, [SemanticResourceAttributes.SERVICE_VERSION]: process.env.SERVICE_VERSION || '1.0.0', [SemanticResourceAttributes.DEPLOYMENT_ENVIRONMENT]: process.env.NODE_ENV || 'development', }) ); this.sdk = new NodeSDK({ resource, spanProcessor: new BatchSpanProcessor(jaegerExporter), instrumentations: [ getNodeAutoInstrumentations({ '@opentelemetry\/instrumentation-fs': { enabled: false, \/\/ Too noisy }, '@opentelemetry\/instrumentation-http': { requestHook: (span, request) => { span.setAttribute('http.request.body', JSON.stringify(request.body)); }, responseHook: (span, response) => { span.setAttribute('http.response.size', response.length); }, }, '@opentelemetry\/instrumentation-express': { requestHook: (span, req) => { span.setAttribute('user.id', req.user?.id); span.setAttribute('session.id', req.session?.id); }, }, }), ], }); this.sdk.start(); \/\/ Graceful shutdown process.on('SIGTERM', () => { this.sdk.shutdown() .then(() => console.log('Tracing terminated')) .catch((error) => console.error('Error terminating tracing', error)) .finally(() => process.exit(0)); }); } \/\/ Custom span creation createSpan(name, fn, attributes = {}) { const tracer = trace.getTracer(this.serviceName); return tracer.startActiveSpan(name, async (span) => { try { \/\/ Add custom attributes Object.entries(attributes).forEach(([key, value]) => { span.setAttribute(key, value); }); \/\/ Execute function const result = await fn(span); span.setStatus({ code: SpanStatusCode.OK }); return result; } catch (error) { span.recordException(error); span.setStatus({ code: SpanStatusCode.ERROR, message: error.message, }); throw error; } finally { span.end(); } }); } } \/\/ Distributed tracing middleware class TracingMiddleware { constructor() { this.tracer = trace.getTracer('http-middleware'); } express() { return (req, res, next) => { const span = this.tracer.startSpan(`${req.method} ${req.path}`, { kind: SpanKind.SERVER, attributes: { 'http.method': req.method, 'http.url': req.url, 'http.target': req.path, 'http.host': req.hostname, 'http.scheme': req.protocol, 'http.user_agent': req.get('user-agent'), 'http.request_content_length': req.get('content-length'), }, }); \/\/ Inject trace context into request req.span = span; req.traceId = span.spanContext().traceId; \/\/ Add trace ID to response headers res.setHeader('X-Trace-Id', req.traceId); \/\/ Override res.end to capture response data const originalEnd = res.end; res.end = function(...args) { span.setAttribute('http.status_code', res.statusCode); span.setAttribute('http.response_content_length', res.get('content-length')); if (res.statusCode >= 400) { span.setStatus({ code: SpanStatusCode.ERROR, message: `HTTP ${res.statusCode}`, }); } span.end(); originalEnd.apply(res, args); }; next(); }; } } ``` ### 4. Debug Logging Framework Implement structured debug logging: **Advanced Logger** ```javascript \/\/ debug-logger.js const winston = require('winston'); const { ElasticsearchTransport } = require('winston-elasticsearch'); class DebugLogger { constructor(options = {}) { this.service = options.service || 'app'; this.level = process.env.LOG_LEVEL || 'debug'; this.logger = this.createLogger(); } createLogger() { const formats = [ winston.format.timestamp(), winston.format.errors({ stack: true }), winston.format.splat(), winston.format.json(), ]; if (process.env.NODE_ENV === 'development') { formats.push(winston.format.colorize()); formats.push(winston.format.printf(this.devFormat)); } const transports = [ new winston.transports.Console({ level: this.level, handleExceptions: true, handleRejections: true, }), ]; \/\/ Add file transport for debugging if (process.env.DEBUG_LOG_FILE) { transports.push( new winston.transports.File({ filename: process.env.DEBUG_LOG_FILE, level: 'debug', maxsize: 10485760, \/\/ 10MB maxFiles: 5, }) ); } \/\/ Add Elasticsearch for production if (process.env.ELASTICSEARCH_URL) { transports.push( new ElasticsearchTransport({ level: 'info', clientOpts: { node: process.env.ELASTICSEARCH_URL, }, index: `logs-${this.service}`, }) ); } return winston.createLogger({ level: this.level, format: winston.format.combine(...formats), defaultMeta: { service: this.service, environment: process.env.NODE_ENV, hostname: require('os').hostname(), pid: process.pid, }, transports, }); } devFormat(info) { const { timestamp, level, message, ...meta } = info; const metaString = Object.keys(meta).length ? '\n' + JSON.stringify(meta, null, 2) : ''; return `${timestamp} [${level}]: ${message}${metaString}`; } \/\/ Debug-specific methods trace(message, meta = {}) { const stack = new Error().stack; this.logger.debug(message, { ...meta, trace: stack, timestamp: Date.now(), }); } timing(label, fn) { const start = process.hrtime.bigint(); const result = fn(); const end = process.hrtime.bigint(); const duration = Number(end - start) \/ 1000000; \/\/ Convert to ms this.logger.debug(`Timing: ${label}`, { duration, unit: 'ms', }); return result; } memory() { const usage = process.memoryUsage(); this.logger.debug('Memory usage', { rss: `${Math.round(usage.rss \/ 1024 \/ 1024)}MB`, heapTotal: `${Math.round(usage.heapTotal \/ 1024 \/ 1024)}MB`, heapUsed: `${Math.round(usage.heapUsed \/ 1024 \/ 1024)}MB`, external: `${Math.round(usage.external \/ 1024 \/ 1024)}MB`, }); } } \/\/ Debug context manager class DebugContext { constructor() { this.contexts = new Map(); } create(id, metadata = {}) { const context = { id, startTime: Date.now(), metadata, logs: [], spans: [], }; this.contexts.set(id, context); return context; } log(contextId, level, message, data = {}) { const context = this.contexts.get(contextId); if (context) { context.logs.push({ timestamp: Date.now(), level, message, data, }); } } export(contextId) { const context = this.contexts.get(contextId); if (!context) return null; return { ...context, duration: Date.now() - context.startTime, logCount: context.logs.length, }; } } ``` ### 5. Source Map Configuration Set up source map support for production debugging: **Source Map Setup** ```javascript \/\/ webpack.config.js module.exports = { mode: 'production', devtool: 'hidden-source-map', \/\/ Generate source maps but don't reference them output: { filename: '[name].[contenthash].js', sourceMapFilename: 'sourcemaps\/[name].[contenthash].js.map', }, plugins: [ \/\/ Upload source maps to error tracking service new SentryWebpackPlugin({ authToken: process.env.SENTRY_AUTH_TOKEN, org: 'your-org', project: 'your-project', include: '.\/dist', ignore: ['node_modules'], urlPrefix: '~\/', release: process.env.RELEASE_VERSION, deleteAfterCompile: true, }), ], }; \/\/ Runtime source map support require('source-map-support').install({ environment: 'node', handleUncaughtExceptions: false, retrieveSourceMap(source) { \/\/ Custom source map retrieval for production if (process.env.NODE_ENV === 'production') { const sourceMapUrl = getSourceMapUrl(source); if (sourceMapUrl) { const map = fetchSourceMap(sourceMapUrl); return { url: source, map: map, }; } } return null; }, }); \/\/ Stack trace enhancement Error.prepareStackTrace = (error, stack) => { const mapped = stack.map(frame => { const fileName = frame.getFileName(); const lineNumber = frame.getLineNumber(); const columnNumber = frame.getColumnNumber(); \/\/ Try to get original position const original = getOriginalPosition(fileName, lineNumber, columnNumber); return { function: frame.getFunctionName() || '', file: original?.source || fileName, line: original?.line || lineNumber, column: original?.column || columnNumber, native: frame.isNative(), async: frame.isAsync(), }; }); return { message: error.message, stack: mapped, }; }; ``` ### 6. Performance Profiling Implement performance profiling tools: **Performance Profiler** ```javascript \/\/ performance-profiler.js const v8Profiler = require('v8-profiler-next'); const fs = require('fs'); const path = require('path'); class PerformanceProfiler { constructor(options = {}) { this.outputDir = options.outputDir || '.\/profiles'; this.profiles = new Map(); \/\/ Ensure output directory exists if (!fs.existsSync(this.outputDir)) { fs.mkdirSync(this.outputDir, { recursive: true }); } } startCPUProfile(id, options = {}) { const title = options.title || `cpu-profile-${id}`; v8Profiler.startProfiling(title, true); this.profiles.set(id, { type: 'cpu', title, startTime: Date.now(), }); return id; } stopCPUProfile(id) { const profileInfo = this.profiles.get(id); if (!profileInfo || profileInfo.type !== 'cpu') { throw new Error(`CPU profile ${id} not found`); } const profile = v8Profiler.stopProfiling(profileInfo.title); const duration = Date.now() - profileInfo.startTime; \/\/ Export profile const fileName = `${profileInfo.title}-${Date.now()}.cpuprofile`; const filePath = path.join(this.outputDir, fileName); profile.export((error, result) => { if (!error) { fs.writeFileSync(filePath, result); console.log(`CPU profile saved to ${filePath}`); } profile.delete(); }); this.profiles.delete(id); return { id, duration, filePath, }; } takeHeapSnapshot(tag = '') { const fileName = `heap-${tag}-${Date.now()}.heapsnapshot`; const filePath = path.join(this.outputDir, fileName); const snapshot = v8Profiler.takeSnapshot(); \/\/ Export snapshot snapshot.export((error, result) => { if (!error) { fs.writeFileSync(filePath, result); console.log(`Heap snapshot saved to ${filePath}`); } snapshot.delete(); }); return filePath; } measureFunction(fn, name = 'anonymous') { const measurements = { name, executions: 0, totalTime: 0, minTime: Infinity, maxTime: 0, avgTime: 0, lastExecution: null, }; return new Proxy(fn, { apply(target, thisArg, args) { const start = process.hrtime.bigint(); try { const result = target.apply(thisArg, args); if (result instanceof Promise) { return result.finally(() => { this.recordExecution(start); }); } this.recordExecution(start); return result; } catch (error) { this.recordExecution(start); throw error; } }, recordExecution(start) { const end = process.hrtime.bigint(); const duration = Number(end - start) \/ 1000000; \/\/ Convert to ms measurements.executions++; measurements.totalTime += duration; measurements.minTime = Math.min(measurements.minTime, duration); measurements.maxTime = Math.max(measurements.maxTime, duration); measurements.avgTime = measurements.totalTime \/ measurements.executions; measurements.lastExecution = new Date(); \/\/ Log slow executions if (duration > 100) { console.warn(`Slow function execution: ${name} took ${duration}ms`); } }, get(target, prop) { if (prop === 'measurements') { return measurements; } return target[prop]; }, }); } } \/\/ Memory leak detector class MemoryLeakDetector { constructor() { this.snapshots = []; this.threshold = 50 * 1024 * 1024; \/\/ 50MB } start(interval = 60000) { this.interval = setInterval(() => { this.checkMemory(); }, interval); } checkMemory() { const usage = process.memoryUsage(); const snapshot = { timestamp: Date.now(), heapUsed: usage.heapUsed, external: usage.external, rss: usage.rss, }; this.snapshots.push(snapshot); \/\/ Keep only last 10 snapshots if (this.snapshots.length > 10) { this.snapshots.shift(); } \/\/ Check for memory leak pattern if (this.snapshots.length >= 5) { const trend = this.calculateTrend(); if (trend.increasing && trend.delta > this.threshold) { console.error('Potential memory leak detected!', { trend, current: snapshot, }); \/\/ Take heap snapshot for analysis const profiler = new PerformanceProfiler(); profiler.takeHeapSnapshot('leak-detection'); } } } calculateTrend() { const recent = this.snapshots.slice(-5); const first = recent[0]; const last = recent[recent.length - 1]; const delta = last.heapUsed - first.heapUsed; const increasing = recent.every((s, i) => i === 0 || s.heapUsed > recent[i - 1].heapUsed ); return { increasing, delta, rate: delta \/ (last.timestamp - first.timestamp) * 1000 * 60, \/\/ MB per minute }; } } ``` ### 7. Debug Configuration Management Centralize debug configurations: **Debug Configuration** ```javascript \/\/ debug-config.js class DebugConfiguration { constructor() { this.config = { \/\/ Debug levels levels: { error: 0, warn: 1, info: 2, debug: 3, trace: 4, }, \/\/ Feature flags features: { remoteDebugging: process.env.ENABLE_REMOTE_DEBUG === 'true', tracing: process.env.ENABLE_TRACING === 'true', profiling: process.env.ENABLE_PROFILING === 'true', memoryMonitoring: process.env.ENABLE_MEMORY_MONITORING === 'true', }, \/\/ Debug endpoints endpoints: { jaeger: process.env.JAEGER_ENDPOINT || 'http:\/\/localhost:14268', elasticsearch: process.env.ELASTICSEARCH_URL || 'http:\/\/localhost:9200', sentry: process.env.SENTRY_DSN, }, \/\/ Sampling rates sampling: { traces: parseFloat(process.env.TRACE_SAMPLING_RATE || '0.1'), profiles: parseFloat(process.env.PROFILE_SAMPLING_RATE || '0.01'), logs: parseFloat(process.env.LOG_SAMPLING_RATE || '1.0'), }, }; } isEnabled(feature) { return this.config.features[feature] || false; } getLevel() { const level = process.env.DEBUG_LEVEL || 'info'; return this.config.levels[level] || 2; } shouldSample(type) { const rate = this.config.sampling[type] || 1.0; return Math.random() < rate; } } \/\/ Debug middleware factory class DebugMiddlewareFactory { static create(app, config) { const middlewares = []; if (config.isEnabled('tracing')) { const tracingMiddleware = new TracingMiddleware(); middlewares.push(tracingMiddleware.express()); } if (config.isEnabled('profiling')) { middlewares.push(this.profilingMiddleware()); } if (config.isEnabled('memoryMonitoring')) { const detector = new MemoryLeakDetector(); detector.start(); } \/\/ Debug routes if (process.env.NODE_ENV === 'development') { app.get('\/debug\/heap', (req, res) => { const profiler = new PerformanceProfiler(); const path = profiler.takeHeapSnapshot('manual'); res.json({ heapSnapshot: path }); }); app.get('\/debug\/profile', async (req, res) => { const profiler = new PerformanceProfiler(); const id = profiler.startCPUProfile('manual'); setTimeout(() => { const result = profiler.stopCPUProfile(id); res.json(result); }, 10000); }); app.get('\/debug\/metrics', (req, res) => { res.json({ memory: process.memoryUsage(), cpu: process.cpuUsage(), uptime: process.uptime(), }); }); } return middlewares; } static profilingMiddleware() { const profiler = new PerformanceProfiler(); return (req, res, next) => { if (Math.random() < 0.01) { \/\/ 1% sampling const id = profiler.startCPUProfile(`request-${Date.now()}`); res.on('finish', () => { profiler.stopCPUProfile(id); }); } next(); }; } } ``` ### 8. Production Debugging Enable safe production debugging: **Production Debug Tools** ```javascript \/\/ production-debug.js class ProductionDebugger { constructor(options = {}) { this.enabled = process.env.PRODUCTION_DEBUG === 'true'; this.authToken = process.env.DEBUG_AUTH_TOKEN; this.allowedIPs = (process.env.DEBUG_ALLOWED_IPS || '').split(','); } middleware() { return (req, res, next) => { if (!this.enabled) { return next(); } \/\/ Check authorization const token = req.headers['x-debug-token']; const ip = req.ip || req.connection.remoteAddress; if (token !== this.authToken || !this.allowedIPs.includes(ip)) { return next(); } \/\/ Add debug headers res.setHeader('X-Debug-Enabled', 'true'); \/\/ Enable debug mode for this request req.debugMode = true; req.debugContext = new DebugContext().create(req.id); \/\/ Override console for this request const originalConsole = { ...console }; ['log', 'debug', 'info', 'warn', 'error'].forEach(method => { console[method] = (...args) => { req.debugContext.log(req.id, method, args[0], args.slice(1)); originalConsole[method](...args); }; }); \/\/ Restore console on response res.on('finish', () => { Object.assign(console, originalConsole); \/\/ Send debug info if requested if (req.headers['x-debug-response'] === 'true') { const debugInfo = req.debugContext.export(req.id); res.setHeader('X-Debug-Info', JSON.stringify(debugInfo)); } }); next(); }; } } \/\/ Conditional breakpoints in production class ConditionalBreakpoint { constructor(condition, callback) { this.condition = condition; this.callback = callback; this.hits = 0; } check(context) { if (this.condition(context)) { this.hits++; \/\/ Log breakpoint hit console.debug('Conditional breakpoint hit', { condition: this.condition.toString(), hits: this.hits, context, }); \/\/ Execute callback if (this.callback) { this.callback(context); } \/\/ In production, don't actually break if (process.env.NODE_ENV === 'production') { \/\/ Take snapshot instead const profiler = new PerformanceProfiler(); profiler.takeHeapSnapshot(`breakpoint-${Date.now()}`); } else { \/\/ In development, use debugger debugger; } } } } \/\/ Usage const breakpoints = new Map(); \/\/ Set conditional breakpoint breakpoints.set('high-memory', new ConditionalBreakpoint( (context) => context.memoryUsage > 500 * 1024 * 1024, \/\/ 500MB (context) => { console.error('High memory usage detected', context); \/\/ Send alert alerting.send('high-memory', context); } )); \/\/ Check breakpoints in code function checkBreakpoints(context) { breakpoints.forEach(breakpoint => { breakpoint.check(context); }); } ``` ### 9. Debug Dashboard Create a debug dashboard for monitoring: **Debug Dashboard** ```html Debug Dashboard<\/title> <style> body { font-family: monospace; background: #1e1e1e; color: #d4d4d4; } .container { max-width: 1200px; margin: 0 auto; padding: 20px; } .metric { background: #252526; padding: 15px; margin: 10px 0; border-radius: 5px; } .metric h3 { margin: 0 0 10px 0; color: #569cd6; } .chart { height: 200px; background: #1e1e1e; margin: 10px 0; } .log-entry { padding: 5px; border-bottom: 1px solid #3e3e3e; } .error { color: #f44747; } .warn { color: #ff9800; } .info { color: #4fc3f7; } .debug { color: #4caf50; } <\/style> <\/head> <body> <div class="container"> <h1>Debug Dashboard<\/h1> <div class="metric"> <h3>System Metrics<\/h3> <div id="metrics"><\/div> <\/div> <div class="metric"> <h3>Memory Usage<\/h3> <canvas id="memoryChart" class="chart"><\/canvas> <\/div> <div class="metric"> <h3>Request Traces<\/h3> <div id="traces"><\/div> <\/div> <div class="metric"> <h3>Debug Logs<\/h3> <div id="logs"><\/div> <\/div> <\/div> <script> \/\/ WebSocket connection for real-time updates const ws = new WebSocket('ws:\/\/localhost:9231\/debug'); ws.onmessage = (event) => { const data = JSON.parse(event.data); switch (data.type) { case 'metrics': updateMetrics(data.payload); break; case 'trace': addTrace(data.payload); break; case 'log': addLog(data.payload); break; } }; function updateMetrics(metrics) { const container = document.getElementById('metrics'); container.innerHTML = ` <div>CPU: ${metrics.cpu.percent}%<\/div> <div>Memory: ${metrics.memory.used}MB \/ ${metrics.memory.total}MB<\/div> <div>Uptime: ${metrics.uptime}s<\/div> <div>Active Requests: ${metrics.activeRequests}<\/div> `; } function addTrace(trace) { const container = document.getElementById('traces'); const entry = document.createElement('div'); entry.className = 'log-entry'; entry.innerHTML = ` <span>${trace.timestamp}<\/span> <span>${trace.method} ${trace.path}<\/span> <span>${trace.duration}ms<\/span> <span>${trace.status}<\/span> `; container.insertBefore(entry, container.firstChild); } function addLog(log) { const container = document.getElementById('logs'); const entry = document.createElement('div'); entry.className = `log-entry ${log.level}`; entry.innerHTML = ` <span>${log.timestamp}<\/span> <span>[${log.level.toUpperCase()}]<\/span> <span>${log.message}<\/span> `; container.insertBefore(entry, container.firstChild); \/\/ Keep only last 100 logs while (container.children.length > 100) { container.removeChild(container.lastChild); } } \/\/ Memory usage chart const memoryChart = document.getElementById('memoryChart').getContext('2d'); const memoryData = []; function updateMemoryChart(usage) { memoryData.push({ time: new Date(), value: usage, }); \/\/ Keep last 50 points if (memoryData.length > 50) { memoryData.shift(); } \/\/ Draw chart \/\/ ... chart drawing logic } <\/script> <\/body> <\/html> ``` ### 10. IDE Integration Configure IDE debugging features: **IDE Debug Extensions** ```json \/\/ .vscode\/extensions.json { "recommendations": [ "ms-vscode.vscode-js-debug", "msjsdiag.debugger-for-chrome", "ms-vscode.vscode-typescript-tslint-plugin", "dbaeumer.vscode-eslint", "ms-azuretools.vscode-docker", "humao.rest-client", "eamodio.gitlens", "usernamehw.errorlens", "wayou.vscode-todo-highlight", "formulahendry.code-runner" ] } \/\/ .vscode\/tasks.json { "version": "2.0.0", "tasks": [ { "label": "Start Debug Server", "type": "npm", "script": "debug", "problemMatcher": [], "presentation": { "reveal": "always", "panel": "dedicated" } }, { "label": "Profile Application", "type": "shell", "command": "node --inspect-brk --cpu-prof --cpu-prof-dir=.\/profiles ${workspaceFolder}\/src\/index.js", "problemMatcher": [] }, { "label": "Memory Snapshot", "type": "shell", "command": "node --inspect --expose-gc ${workspaceFolder}\/scripts\/heap-snapshot.js", "problemMatcher": [] } ] } ``` ## Output Format 1. **Debug Configuration**: Complete setup for all debugging tools 2. **Integration Guide**: Step-by-step integration instructions 3. **Troubleshooting Playbook**: Common debugging scenarios and solutions 4. **Performance Baselines**: Metrics for comparison 5. **Debug Scripts**: Automated debugging utilities 6. **Dashboard Setup**: Real-time debugging interface 7. **Documentation**: Team debugging guidelines 8. **Emergency Procedures**: Production debugging protocols Focus on creating a comprehensive debugging environment that enhances developer productivity and enables rapid issue resolution in all environments.</article></body></html>