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import { Request, Response, NextFunction } from 'express'
import { Prisma } from '@prisma/client'
export interface AppError extends Error {
statusCode?: number
code?: string
}
export const errorHandler = (
error: AppError,
req: Request,
res: Response,
next: NextFunction
) => {
console.error('Error:', error)
// Default error
let statusCode = error.statusCode || 500
let message = error.message || 'Internal server error'
let code = error.code || 'INTERNAL_ERROR'
// Prisma errors
if (error instanceof Prisma.PrismaClientKnownRequestError) {
switch (error.code) {
case 'P2002':
statusCode = 409
message = 'Resource already exists'
code = 'DUPLICATE_ERROR'
break
case 'P2025':
statusCode = 404
message = 'Resource not found'
code = 'NOT_FOUND'
break
case 'P2003':
statusCode = 400
message = 'Invalid reference'
code = 'INVALID_REFERENCE'
break
default:
statusCode = 400
message = 'Database error'
code = 'DATABASE_ERROR'
}
}
// Validation errors
if (error.name === 'ValidationError') {
statusCode = 400
code = 'VALIDATION_ERROR'
}
// JWT errors
if (error.name === 'JsonWebTokenError') {
statusCode = 401
message = 'Invalid token'
code = 'INVALID_TOKEN'
}
if (error.name === 'TokenExpiredError') {
statusCode = 401
message = 'Token expired'
code = 'TOKEN_EXPIRED'
}
// Multer errors (file upload)
if (error.code === 'LIMIT_FILE_SIZE') {
statusCode = 413
message = 'File too large'
code = 'FILE_TOO_LARGE'
}
if (error.code === 'LIMIT_FILE_COUNT') {
statusCode = 413
message = 'Too many files'
code = 'TOO_MANY_FILES'
}
// Don't expose internal errors in production
if (process.env.NODE_ENV === 'production' && statusCode === 500) {
message = 'Internal server error'
}
res.status(statusCode).json({
success: false,
error: message,
code,
...(process.env.NODE_ENV === 'development' && { stack: error.stack })
})
}
export const notFoundHandler = (req: Request, res: Response) => {
res.status(404).json({
success: false,
error: 'Route not found',
code: 'NOT_FOUND'
})
}
export const asyncHandler = (fn: Function) => {
return (req: Request, res: Response, next: NextFunction) => {
Promise.resolve(fn(req, res, next)).catch(next)
}
}
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