BE06 logging system_Vedant

[Vedant1515]

Overview
Implemented centralized structured logging across the NutriHelp API backend to improve traceability, observability, and production debugging.

New Files

utils/logger.js – Centralized Winston-based structured logger (163 lines)
middleware/requestLogger.js – HTTP request/response logging middleware (83 lines)
middleware/structuredErrorHandler.js – Structured error handling middleware (79 lines)

Modified Files

server.js – Integrated request logger and error handler middleware
package.json – Added Winston dependency
10 controllers updated: authController, appointmentController, chatbotController, homeServiceController, imageClassificationController, loginController, medicalPredictionController, notificationController, uploadController, userPreferencesController

Changes

Every HTTP request logged with timestamp, method, endpoint, status code, and duration
Errors captured in consistent structured format with stack traces where appropriate
Environment-aware logging, readable in dev, concise and structured in production
Replaced unstructured console.log calls across all major controllers

[TienNguyen3711]

It would be stronger if we enforced a more consistent schema across all logs, especially fields like requestId, endpoint, method, and statusCode.

[TienNguyen3711]

I’d recommend also returning the requestId in a response header and ensuring downstream services consistently include it in their logs for end-to-end traceability

[TienNguyen3711]

It currently overlaps with errorLogService. It would be better to consolidate on a single structured logging path so error logs do not end up split across different formats.

[TienNguyen3711]

Please resolve the merge conflict.