All files / middleware errorHandler.js

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const logger = require('../utils/logger');
 
const errorHandler = (err, req, res, next) => {
  logger.error('Error:', {
    message: err.message,
    stack: err.stack,
    path: req.path,
    method: req.method,
    ip: req.ip,
    userId: req.userId
  });
 
  // Sequelize validation error
  if (err.name === 'SequelizeValidationError') {
    return res.status(400).json({
      error: 'Validation error',
      details: err.errors.map(e => ({
        field: e.path,
        message: e.message
      }))
    });
  }
 
  // Sequelize unique constraint error
  if (err.name === 'SequelizeUniqueConstraintError') {
    return res.status(409).json({
      error: 'Resource already exists',
      details: err.errors.map(e => e.message)
    });
  }
 
  // JWT errors
  if (err.name === 'JsonWebTokenError') {
    return res.status(401).json({ error: 'Invalid token' });
  }
 
  if (err.name === 'TokenExpiredError') {
    return res.status(401).json({ error: 'Token expired' });
  }
 
  // Validation error from express-validator
  if (err.array && typeof err.array === 'function') {
    return res.status(400).json({
      error: 'Validation error',
      details: err.array()
    });
  }
 
  // Default error
  const statusCode = err.statusCode || 500;
  const message = err.message || 'Internal server error';
 
  res.status(statusCode).json({
    error: message,
    ...(process.env.NODE_ENV === 'development' && { stack: err.stack })
  });
};
 
module.exports = errorHandler;