get-express-starter/templates/express-postgres-prisma/src/middlewares/error.ts

Get production ready express boilerplate with a single command

import { env } from '@/config';
import { logger } from '@/config/logger';
import { ApiError } from '@/utils/ApiError';
import type { NextFunction, Request, Response } from 'express';
import httpStatus from 'http-status';

interface Error {
  message: string;
  stack: string;
  statusCode?: number;
}

export const errorConverter = (err: Error | ApiError, req: Request, res: Response, next: NextFunction) => {
  let error = err;
  if (!(error instanceof ApiError)) {
    const statusCode = (error.statusCode = httpStatus.INTERNAL_SERVER_ERROR);
    const message = error.message || httpStatus[statusCode];
    error = new ApiError(statusCode, message, false, err.stack);
  }
  next(error);
};

export const errorHandler = (err: ApiError, req: Request, res: Response, next: NextFunction) => {
  let { statusCode, message } = err;
  if (env.mode === 'production' && !err.isOperational) {
    statusCode = httpStatus.INTERNAL_SERVER_ERROR;
    message = httpStatus[httpStatus.INTERNAL_SERVER_ERROR];
  }

  res.locals.errorMessage = err.message;

  const response = {
    code: statusCode,
    message,
    ...(env.mode === 'development' && { stack: err.stack }),
  };

  if (env.mode === 'development') {
    logger.error(err);
  }

  res.status(statusCode).send(response);
};