nexlog

A modern, enterprise-grade logging library for Next.js with Edge Runtime support, automatic data sanitization, and distributed tracing. Built for production-scale applications with GDPR compliance, correlation IDs, and zero-configuration security.

✨ Key Features

🚀 Edge Runtime & Production Ready

🌐 Edge Runtime Compatible - Works seamlessly in Next.js middleware, Vercel Edge Functions, Cloudflare Workers
🛡️ Automatic Data Sanitization - GDPR-compliant PII protection with smart field detection
🔗 Correlation IDs - W3C Trace Context standard for distributed tracing
⚡ Advanced Error Serialization - Proper cause chain support with circular reference handling
💨 Performance Optimized - Memory leak prevention, circular buffers, and efficient batching
🚦 Rate Limiting & Sampling - Enterprise-grade volume control with per-level configuration

🔒 Security & Compliance

🔐 Client/Server Separation - Clear patterns for secure logging architectures
🏷️ Smart Data Masking - Auto-detects passwords, tokens, emails, credit cards, and more
📊 Context Management - AsyncLocalStorage-based context persistence in Node.js
🔍 Smart Module Detection - Auto-namespacing from stack traces for better debugging

🎨 Developer Experience

🎯 Pretty Print Formatter - Beautiful development console output with emojis
🔄 Zero Configuration - Works out-of-the-box with intelligent defaults
🌍 Universal Runtime - Server, browser, edge, Node.js, Bun - everything works
💪 TypeScript First - Full type safety and IntelliSense support
⚛️ React Integration - Hooks, providers, and components for React apps
🎛️ Dynamic Configuration - Runtime adjustments via environment variables

📦 Installation

# Recommended: Bun (blazing fast)
bun add nexlog

# Also works with npm/yarn/pnpm
npm install nexlog
yarn add nexlog
pnpm add nexlog

🚀 Quick Start

Edge Runtime Compatible (Next.js Middleware)

// middleware.ts - Works in Edge Runtime!
import { EdgeLogger } from 'nexlog/edge';

const logger = new EdgeLogger({
  structured: true,
  sanitize: true, // Auto-mask sensitive data
});

export function middleware(request: NextRequest) {
  logger.info('Request received', {
    path: request.nextUrl.pathname,
    method: request.method,
    userAgent: request.headers.get('user-agent'),
    // PII automatically sanitized!
    email: 'user@example.com', // → us***@example.com
    password: 'secret123', // → [REDACTED]
  });
}

Server-Side with Context & Correlation

// app/api/users/route.ts
import logger from 'nexlog';
import { context } from 'nexlog/context';

export async function POST(request: Request) {
  return context()
    .withRequestId(crypto.randomUUID())
    .withUserId(await getUserId(request))
    .runAsync(async () => {
      logger.info('Creating user', {
        email: await request.json().email, // Auto-sanitized
      });
      
      const user = await createUser(data);
      logger.success('User created successfully', { userId: user.id });
      
      return Response.json(user);
    });
}

Client-Side (Secure by Default)

// Only non-sensitive logs reach the client
import logger from 'nexlog';

// This will be filtered out on client
logger.debug('Debug info with API key', { apiKey: 'sk_test_123' });

// This reaches the client safely
logger.info('User action', { action: 'button_click', page: '/dashboard' });

🏗️ Production Configuration

High-Volume Application Setup

import { Logger } from 'nexlog';
import { defaultSanitizer } from 'nexlog/sanitizer';

const logger = new Logger({
  level: 'info',
  structured: true,
  sanitize: true,
  
  // Performance optimizations
  sampling: {
    trace: 0.01,    // 1% of trace logs
    debug: 0.1,     // 10% of debug logs
    info: 1.0,      // All info logs
  },
  
  // Rate limiting
  rateLimit: {
    maxLogs: 1000,  // Max 1000 logs per minute
    windowMs: 60000,
  },
  
  // Memory management
  bufferSize: 1000,
  autoFlush: true,
});

// Add custom sanitization rules
defaultSanitizer.addPattern('custom-token', {
  pattern: /token_[a-zA-Z0-9]+/g,
  replacement: '[TOKEN_REDACTED]',
});

Environment-Based Configuration

# .env.production
NEXLOG_LEVEL=warn
NEXLOG_STRUCTURED=true
NEXLOG_SANITIZE=true
NEXLOG_EDGE_ENABLED=true
NEXLOG_SAMPLING_INFO=0.1
NEXLOG_CONTEXT_SERVICE=api
NEXLOG_CONTEXT_VERSION=5.2.1

🔥 Advanced Features

Distributed Tracing & Correlation

Track requests across your entire application:

import { correlationManager } from 'nexlog/correlation';
import { contextManager } from 'nexlog/context';

// Middleware automatically extracts trace context
app.use(correlationManager.middleware());

// In your route handlers - correlation IDs are automatically included
logger.info('Processing payment', { 
  amount: 100,
  // requestId, traceId, spanId automatically added from context
});

// Create child spans for operations
const childContext = correlationManager.createChildSpan();
contextManager.run(childContext, () => {
  logger.info('Calling external API'); // New span ID
});

Smart Data Sanitization

Built-in GDPR compliance with intelligent field detection:

import { sanitize, defaultSanitizer } from 'nexlog/sanitizer';

// Automatic detection of sensitive fields
logger.info('User data', {
  email: 'user@example.com',     // → us***@example.com
  password: 'secret123',         // → [REDACTED]
  creditCard: '4532123456789012', // → ****9012
  apiKey: 'sk_live_xyz123',      // → [REDACTED]
  ssn: '123-45-6789',           // → [REDACTED]
});

// Custom sanitization rules
defaultSanitizer.addPattern('custom', {
  pattern: /CUSTOM_[A-Z0-9]+/g,
  replacement: '[CUSTOM_REDACTED]',
});

Context Management & AsyncLocalStorage

Persistent context across async operations:

import { context, contextManager } from 'nexlog/context';

// Express middleware
app.use((req, res, next) => {
  context()
    .withRequestId(req.id)
    .withUserId(req.user?.id)
    .withSessionId(req.session.id)
    .run(() => next());
});

// Anywhere in your request handler
logger.info('User action'); // Automatically includes requestId, userId, sessionId

// Manual context management
contextManager.run({ requestId: '123', operation: 'checkout' }, () => {
  logger.info('Starting checkout'); // Context automatically included
  processPayment(); // Context propagated to child calls
});

Advanced Error Serialization

Proper error handling with cause chains:

import { ErrorSerializer } from 'nexlog/utils';

try {
  await riskyOperation();
} catch (error) {
  // Automatically serializes error chains, stack traces, and custom properties
  logger.error('Operation failed', { 
    error, // Full error serialization with cause chain
    operation: 'user_signup',
  });
  
  // Manual serialization
  const serialized = ErrorSerializer.serialize(error);
  console.log(serialized.stack); // Parsed stack frames
  console.log(serialized.cause); // Cause chain
}

Performance & Rate Limiting

Enterprise-grade volume control:

import { RateLimiter, AdvancedSampler } from 'nexlog/utils';

// Per-level sampling
const sampler = new AdvancedSampler({
  trace: 0.01,  // 1% of trace logs
  debug: 0.1,   // 10% of debug logs  
  info: 1.0,    // All info logs
  error: 1.0,   // All error logs
});

// Rate limiting
const rateLimiter = new RateLimiter({
  maxLogs: 100,
  windowMs: 60000, // 100 logs per minute
});

// Per-message rate limiting
logger.info('High frequency event', {
  _rateLimit: '5/minute', // Only log this message 5 times per minute
  _sample: 0.1,          // Only sample 10% of these logs
});

Pretty Print Development Mode

Beautiful console output during development:

import { PrettyFormatter } from 'nexlog/formatters';

const formatter = new PrettyFormatter({
  colors: true,
  emoji: true,           // Use emoji for log levels
  timestamps: 'relative', // Show relative timestamps
  groupCollapsed: true,   // Collapse metadata groups
});

// Development logger with pretty printing
const devLogger = new Logger({
  formatter: process.env.NODE_ENV === 'development' ? formatter : undefined,
});

Performance Monitoring

Built-in utilities for performance measurement:

// Time async operations
const result = await logger.time('database-query', async () => {
  return await db.query('SELECT * FROM users');
});
// Automatically logs: "database-query completed" with duration

// Profile code sections
const endProfile = logger.profile('heavy-computation');
// ... perform computation ...
endProfile();
// Logs: "Profile: heavy-computation" with duration

// Manual performance logging in React
const { start, end } = usePerformanceLogger('component-render');
start();
// ... component logic ...
end({ componentName: 'UserList' });

Batching for Performance

Optimize logging performance with batching:

import { BatchedTransport, ConsoleTransport } from 'nexlog';

const batchedLogger = new Logger({
  transports: [
    new BatchedTransport(
      new ConsoleTransport(),
      {
        maxBatchSize: 100,    // Flush after 100 logs
        flushInterval: 5000   // Flush every 5 seconds
      }
    )
  ]
});

// Logs are batched and flushed efficiently
for (let i = 0; i < 1000; i++) {
  batchedLogger.info(`Processing item ${i}`);
}

// Manually flush all pending logs
await batchedLogger.flush();

⚛️ React Integration

LoggerProvider

import { LoggerProvider } from 'nexlog/react';

export default function App() {
  return (
    <LoggerProvider 
      initialLevel="debug"
      namespace="my-app"
      config={{
        context: { version: '1.0.0' },
        structured: process.env.NODE_ENV === 'production'
      }}
      logLifecycle={true} // Log app start/stop, network events, errors
    >
      <YourApp />
    </LoggerProvider>
  );
}

React Hooks

import { useLogger, useChildLogger, usePerformanceLogger } from 'nexlog/react';

function MyComponent() {
  // Access the logger instance
  const { logger, level, setLevel, stats } = useLogger();
  
  // Create a child logger for this component
  const componentLogger = useChildLogger('MyComponent');
  
  // Performance logging
  const { start, end } = usePerformanceLogger('data-fetch');
  
  useEffect(() => {
    start();
    fetchData().then(data => {
      end({ recordCount: data.length });
      componentLogger.info('Data loaded', { count: data.length });
    });
  }, []);
  
  return (
    <div>
      <p>Log Level: {level}</p>
      <p>Total Logs: {stats.logCount}</p>
      <button onClick={() => setLevel('debug')}>Set Debug</button>
    </div>
  );
}

Higher-Order Component

import { withLogger } from 'nexlog/react';

interface Props {
  logger?: Logger;
}

const MyComponent: React.FC<Props> = ({ logger }) => {
  logger?.info('Component rendered');
  return <div>My Component</div>;
};

export default withLogger(MyComponent, 'MyComponent');

DevTools Component

Add visual logger controls in development:

import { LoggerProvider, LoggerDevTools } from 'nexlog/react';

function App() {
  return (
    <LoggerProvider>
      <YourApp />
      {process.env.NODE_ENV === 'development' && (
        <LoggerDevTools position="bottom-right" />
      )}
    </LoggerProvider>
  );
}

The DevTools component provides:

Real-time log level adjustment
Enable/disable logging
View logger statistics
Monitor active transports and child loggers

🎯 Log Levels

Levels from least to most severe:

trace - Detailed debugging information
debug - Debug information for development
info - General informational messages
warn - Warning messages for potential issues
error - Error messages for failures
fatal - Critical failures requiring immediate attention

🌍 Runtime Environment Support

Universal compatibility across all JavaScript runtimes:

import { detectRuntime, IS_EDGE, IS_NODE, IS_BROWSER } from 'nexlog';

// Automatic runtime detection and optimization
console.log(detectRuntime()); // 'node' | 'edge' | 'browser' | 'worker' | 'bun'

// Edge Runtime (Vercel Edge Functions, Cloudflare Workers)
if (IS_EDGE) {
  // Optimized for edge with structured logging
  import('nexlog/edge').then(({ EdgeLogger }) => {
    const logger = new EdgeLogger({ structured: true });
  });
}

// Node.js (full feature set)
if (IS_NODE) {
  // Full features including AsyncLocalStorage context
  import('nexlog').then(({ Logger }) => {
    const logger = new Logger({ 
      useAsyncContext: true,
      colors: true,
    });
  });
}

// Browser (security-focused)
if (IS_BROWSER) {
  // Client-safe logging with automatic sensitive data filtering
  import('nexlog/browser').then(({ default: logger }) => {
    logger.setLevel('warn'); // Don't send debug info to client
  });
}

📊 Structured Logging

Enable structured logging for production environments:

const logger = new Logger({
  structured: true,
  level: 'info'
});

logger.info('User action', { userId: 123, action: 'login' });
// Output: {"timestamp":"2024-01-01T00:00:00.000Z","level":"INFO","message":"User action","userId":123,"action":"login"}

📈 Logger Statistics

Monitor logger performance and usage:

const stats = logger.getStats();
console.log({
  logCount: stats.logCount,        // Total logs written
  uptime: stats.uptime,            // Logger uptime in ms
  children: stats.children,        // Number of child loggers
  transports: stats.transports     // Number of active transports
});

🎛️ Environment Configuration

nexlog can be fully configured via environment variables, making it perfect for production deployments without code changes.

Quick Setup

# Copy the example configuration
cp node_modules/nexlog/.env.example .env.local

# Or create your own
echo "NEXLOG_LEVEL=warn" >> .env.local
echo "NEXLOG_SSR_ONLY=true" >> .env.local

Common Scenarios

Production (High Volume)

NEXLOG_LEVEL=warn
NEXLOG_STRUCTURED=true
NEXLOG_SSR_ONLY=true
NEXLOG_SAMPLING_RATE=0.1  # Log only 10% of messages
NEXLOG_BATCH_SIZE=500

Development

NEXLOG_LEVEL=trace
NEXLOG_COLORS=true
NEXLOG_DEV_TOOLS=true
NEXLOG_PERFORMANCE=true
NEXLOG_DEBUG=true

Disable Client Logging

NEXLOG_CLIENT_ENABLED=false
NEXLOG_SSR_ONLY=true

Debug Specific Modules

NEXLOG_LEVEL=trace
NEXLOG_INCLUDE_PATTERNS=AuthService.*,Database.*
NEXLOG_EXCLUDE_PATTERNS=health.*,ping

All Environment Variables

Variable	Description	Default
Core Settings
`NEXLOG_LEVEL`	Log level (trace/debug/info/warn/error/fatal)	`info`
`NEXLOG_ENABLED`	Enable/disable all logging	`true`
`NEXLOG_SSR_ONLY`	Only log on server-side	`false`
`NEXLOG_CLIENT_ENABLED`	Enable browser logging	`true`
`NEXLOG_EDGE_ENABLED`	Enable edge runtime logging	`true`
Output Settings
`NEXLOG_STRUCTURED`	JSON structured logging	`false`
`NEXLOG_COLORS`	Colored console output	`true`
`NEXLOG_NAMESPACE`	Default namespace	-
Performance
`NEXLOG_SAMPLING_RATE`	Log sampling (0-1)	`1`
`NEXLOG_BATCH_SIZE`	Batch size	`100`
`NEXLOG_FLUSH_INTERVAL`	Flush interval (ms)	`1000`
Features
`NEXLOG_DEV_TOOLS`	Enable DevTools in prod	`false`
`NEXLOG_LIFECYCLE`	Log app lifecycle	`true`
`NEXLOG_PERFORMANCE`	Include perf metrics	`false`
`NEXLOG_STACK_TRACES`	Include stack traces	`true`
Filtering
`NEXLOG_INCLUDE_PATTERNS`	Include regex patterns	-
`NEXLOG_EXCLUDE_PATTERNS`	Exclude regex patterns	-
Context
`NEXLOG_CONTEXT_*`	Add to log context	-

Dynamic Context

Add any context to all logs via environment variables:

NEXLOG_CONTEXT_VERSION=1.0.0
NEXLOG_CONTEXT_ENVIRONMENT=production
NEXLOG_CONTEXT_REGION=us-west-2
NEXLOG_CONTEXT_SERVICE=api

All logs will include: {version: "1.0.0", environment: "production", ...}

Priority System

Configuration follows this priority (highest wins):

Runtime changes (logger.setLevel())
Environment variables (NEXLOG_*)
Code configuration (new Logger({...}))
Default values

Programmatic Access

import { configManager, ENV_VARS } from 'nexlog';

// Check current configuration
const config = configManager.getConfig();
console.log('Current log level:', config.level);

// Check if should log in current environment
if (configManager.shouldLog('browser')) {
  console.log('Browser logging is enabled');
}

// Runtime configuration changes
configManager.set('level', 'debug');
configManager.set('samplingRate', 0.5);

// Get environment variable names
console.log(ENV_VARS.NEXLOG_LEVEL); // "NEXLOG_LEVEL"

🔧 Next.js Integration

Edge Runtime Configuration

// next.config.js
const nextConfig = {
  // No transpilePackages needed for v5.2.1+!
  experimental: {
    runtime: 'edge', // nexlog works seamlessly
  },
};

export default nextConfig;

Security Best Practices

// app/api/secure/route.ts - Server-side only
import logger from 'nexlog';

export async function POST(request: Request) {
  // This will be automatically sanitized
  logger.info('API call', {
    apiKey: request.headers.get('authorization'), // → [REDACTED]
    userId: getUserId(request),
    timestamp: Date.now(),
  });
}

// app/components/ClientComponent.tsx - Client-safe
'use client';
import logger from 'nexlog';

export default function ClientComponent() {
  const handleClick = () => {
    // Only non-sensitive logs reach the client
    logger.info('Button clicked', { 
      button: 'submit',
      timestamp: Date.now(),
      // Any sensitive data is automatically filtered
    });
  };
}

🎨 API Reference

Logger Class

class Logger {
  constructor(config?: LoggerConfig)
  
  // Logging methods
  trace(message: string, metadata?: LogMetadata): void
  debug(message: string, metadata?: LogMetadata): void
  info(message: string, metadata?: LogMetadata): void
  warn(message: string, metadata?: LogMetadata): void
  error(message: string, metadata?: LogMetadata): void
  fatal(message: string, metadata?: LogMetadata): void
  
  // Configuration
  setLevel(level: LogLevel): void
  getLevel(): LogLevel
  enable(): void
  disable(): void
  isEnabled(): boolean
  setSSROnly(ssrOnly: boolean): void
  setContext(context: LogMetadata): void
  
  // Child loggers
  child(namespace: string, config?: Partial<LoggerConfig>): Logger
  
  // Transports
  addTransport(transport: Transport): void
  removeTransport(name: string): void
  
  // Plugins
  use(plugin: LoggerPlugin): void
  
  // Performance
  time<T>(label: string, fn: () => T | Promise<T>, metadata?: LogMetadata): Promise<T>
  profile(label: string): () => void
  
  // Utilities
  flush(): Promise<void>
  getStats(): LoggerStats
}

Types

type LogLevel = "trace" | "debug" | "info" | "warn" | "error" | "fatal";
type Environment = "server" | "edge" | "browser" | "unknown";
type LogMetadata = Record<string, unknown>;

interface LoggerConfig {
  level?: LogLevel;
  enabled?: boolean;
  ssrOnly?: boolean;
  namespace?: string;
  context?: LogMetadata;
  batchSize?: number;
  flushInterval?: number;
  transports?: Transport[];
  structured?: boolean;
  samplingRate?: number;
}

interface LogEntry {
  timestamp: string;
  level: LogLevel;
  message: string;
  namespace?: string;
  metadata?: LogMetadata;
  context?: LogMetadata;
  environment: Environment;
  stack?: string;
  performance?: {
    memory?: NodeJS.MemoryUsage;
    timestamp: number;
  };
}

interface Transport {
  name: string;
  enabled?: boolean;
  level?: LogLevel;
  log(entry: LogEntry): void | Promise<void>;
  flush?(): void | Promise<void>;
}

interface LoggerPlugin {
  name: string;
  init?(logger: Logger): void;
  transform?(entry: LogEntry): LogEntry;
  beforeLog?(entry: LogEntry): void | false;
  afterLog?(entry: LogEntry): void;
}

🚀 Performance

nexlog is designed for maximum performance with Bun:

Zero dependencies - No external dependencies for minimal bundle size
Bun-optimized - Leverages Bun's fast runtime and APIs
Lazy evaluation - Logs are only formatted when needed
Batching support - Reduce I/O overhead with batched writes
Sampling - Control log volume in high-traffic scenarios
Efficient child loggers - Cached instances with shared configuration
Minimal overhead - Disabled logs have near-zero performance impact
High-precision timing - Uses Bun.nanoseconds() for accurate measurements

Benchmark results with Bun (10,000 logs):

Simple logging: ~80,000 ops/sec
With metadata: ~65,000 ops/sec
Child logger creation: 15,000+ ops/sec
Batched logging: ~120,000 ops/sec

🧪 Testing

# Run tests with Bun's built-in test runner
bun test

# Watch mode
bun test --watch

# Coverage
bun test --coverage

# Test environment configuration
bun run test-env.ts

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

🚨 Security & Compliance

GDPR Compliance

nexlog automatically protects personally identifiable information:

Email addresses: user@example.com → us***@example.com
Credit cards: 4532123456789012 → ****9012
API keys: sk_live_xyz123 → [REDACTED]
Passwords: Any field named password, pass, pwd → [REDACTED]
Tokens: access_token, refresh_token, etc. → [REDACTED]

Client/Server Security Separation

// Server-side: Full logging with sensitive data sanitization
import logger from 'nexlog'; // Full server logger

// Client-side: Automatically filtered logging
import logger from 'nexlog/browser'; // Client-safe logger

📚 Documentation

For comprehensive production implementation guidance, see our Implementation Guide.

📄 License

MIT License - see LICENSE file for details.

💖 Support

If you find nexlog helpful, consider sponsoring me. Your support helps maintain and improve this project.

🔄 Migration Guide

From v4.x to v5.2.1+

The v5.2.1+ release is backward compatible with enhanced features:

// v4.x code still works
import logger from 'nexlog';
logger.info('Hello');

// v5.2.1+ enhanced features
import logger from 'nexlog';
import { context } from 'nexlog/context';

// Now with automatic data sanitization and context
context()
  .withRequestId('req_123')
  .run(() => {
    logger.info('Hello', {
      password: 'secret123', // → [REDACTED]
      userId: 12345,         // → preserved
    });
  });

Key improvements in v5.2.1+:

Edge Runtime compatibility for Next.js middleware
Automatic data sanitization with GDPR compliance
Correlation IDs with W3C Trace Context support
Advanced error serialization with cause chains
Performance improvements with memory leak prevention
Context management with AsyncLocalStorage
Security by default with client/server separation

Name		Name	Last commit message	Last commit date
Latest commit History 84 Commits
.changeset		.changeset
.github/workflows		.github/workflows
docs		docs
src		src
tests		tests
.env.example		.env.example
.gitignore		.gitignore
CHANGELOG.md		CHANGELOG.md
LICENSE		LICENSE
README.md		README.md
UPGRADE.md		UPGRADE.md
VERSIONING_INCIDENT_REPORT.md		VERSIONING_INCIDENT_REPORT.md
biome.json		biome.json
bun.lockb		bun.lockb
package.json		package.json
test-env.js		test-env.js
test-env.ts		test-env.ts
tsconfig.json		tsconfig.json

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nexlog

✨ Key Features

🚀 Edge Runtime & Production Ready

🔒 Security & Compliance

🎨 Developer Experience

📦 Installation

🚀 Quick Start

Edge Runtime Compatible (Next.js Middleware)

Server-Side with Context & Correlation

Client-Side (Secure by Default)

🏗️ Production Configuration

High-Volume Application Setup

Environment-Based Configuration

🔥 Advanced Features

Distributed Tracing & Correlation

Smart Data Sanitization

Context Management & AsyncLocalStorage

Advanced Error Serialization

Performance & Rate Limiting

Pretty Print Development Mode

Performance Monitoring

Batching for Performance

⚛️ React Integration

LoggerProvider

React Hooks

Higher-Order Component

DevTools Component

🎯 Log Levels

🌍 Runtime Environment Support

📊 Structured Logging

📈 Logger Statistics

🎛️ Environment Configuration

Quick Setup

Common Scenarios

Production (High Volume)

Development

Disable Client Logging

Debug Specific Modules

All Environment Variables

Dynamic Context

Priority System

Programmatic Access

🔧 Next.js Integration

Edge Runtime Configuration

Security Best Practices

🎨 API Reference

Logger Class

Types

🚀 Performance

🧪 Testing

🤝 Contributing

🚨 Security & Compliance

GDPR Compliance

Client/Server Security Separation

📚 Documentation

📄 License

💖 Support

🔄 Migration Guide

From v4.x to v5.2.1+

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