backend logging

backend/middleware/errorLogger.js

@@ -0,0 +1,33 @@
+const logger = require('../utils/logger');
+
+const errorLogger = (err, req, res, next) => {
+  // Create a request-specific logger with request ID
+  const reqLogger = logger.withRequestId(req.id);
+
+  // Log the error with context
+  const errorContext = {
+    method: req.method,
+    url: req.url,
+    userAgent: req.get('User-Agent'),
+    ip: req.ip,
+    userId: req.user?.id || 'anonymous',
+    body: logger.sanitize(req.body),
+    params: req.params,
+    query: req.query,
+    statusCode: err.statusCode || 500,
+    stack: err.stack,
+  };
+
+  if (err.statusCode && err.statusCode < 500) {
+    // Client errors (4xx)
+    reqLogger.warn(`Client error: ${err.message}`, errorContext);
+  } else {
+    // Server errors (5xx)
+    reqLogger.error(`Server error: ${err.message}`, errorContext);
+  }
+
+  // Pass error to next middleware
+  next(err);
+};
+
+module.exports = errorLogger;