NestJs error filter example.

exception.filter.ts

import { ArgumentsHost, Catch, ExceptionFilter, HttpException, HttpStatus, Logger } from '@nestjs/common';

@Catch()
export class HttpErrorFilter implements ExceptionFilter {
  private readonly logger : Logger 
  constructor(){
    this.logger = new Logger 
  }
  catch(exception: Error, host: ArgumentsHost): any {
    const ctx = host.switchToHttp();
    const request = ctx.getRequest();
    const response = ctx.getResponse();

    const statusCode = exception instanceof HttpException ? exception.getStatus() : HttpStatus.INTERNAL_SERVER_ERROR
    const message = exception instanceof HttpException ?  exception.message || exception.message?.error: 'Internal server error'

    const devErrorResponse: any = {
      statusCode,
      timestamp: new Date().toISOString(),
      path: request.url,
      method: request.method,
      errorName: exception?.name,
      message: exception?.message
    };

    const prodErrorResponse: any = {
      statusCode,
      message
    };
    this.logger.log( `request method: ${request.method} request url${request.url}`, JSON.stringify(devErrorResponse));
    response.status(statusCode).json( process.env.NODE_ENV === 'development'? devErrorResponse: prodErrorResponse);
  }
}