</>
typescriptbeginner

Structured Request Logger Middleware

Express middleware that logs request/response details as structured JSON with timing information.

typescript
import { Request, Response, NextFunction } from 'express';

export function requestLogger(req: Request, res: Response, next: NextFunction) {
  const start = Date.now();

  res.on('finish', () => {
    const log = {
      timestamp: new Date().toISOString(),
      method: req.method,
      path: req.originalUrl,
      status: res.statusCode,
      duration: `${Date.now() - start}ms`,
      userAgent: req.headers['user-agent'],
      ip: req.ip,
    };
    console.log(JSON.stringify(log));
  });

  next();
}

Use Cases

  • API monitoring
  • Debugging and troubleshooting

Tags

#express#logging#observability#middleware

Related Snippets

Similar patterns you can reuse in the same workflow.

typescriptintermediate

Request ID Tracing Middleware

Express middleware that generates or forwards X-Request-Id headers for distributed tracing.

Best for: Distributed tracing

#express#tracing
typescriptintermediate

JWT Verify Middleware

Express middleware that verifies JWT tokens from the Authorization header and attaches the decoded payload to the request.

Best for: REST API authentication

#jwt#express
typescriptintermediate

In-Memory Rate Limiter for Express

Token bucket rate limiter middleware for Express with configurable window and max requests per IP.

Best for: API abuse prevention

#express#rate-limit
typescriptbeginner

Async Error Handler Wrapper

Higher-order function that wraps async Express route handlers and forwards rejected promises to error middleware.

Best for: Express route error handling

#express#async