Refactor HttpExceptionFilter to unify the error response

src/common/filters/http-exception/http-exception.filter.ts

@@ -5,34 +5,55 @@ import {
   HttpException,
   HttpStatus,
 } from '@nestjs/common';
-import { Response } from 'express';
+import { Request, Response } from 'express';
 
 @Catch()
 export class HttpExceptionFilter implements ExceptionFilter {
-  catch(exception: unknown, host: ArgumentsHost) {
+  catch(exception: unknown, host: ArgumentsHost): void {
     const ctx = host.switchToHttp();
     const response = ctx.getResponse<Response>();
     const request = ctx.getRequest<Request>();
-    const status =
-      exception instanceof HttpException
-        ? exception.getStatus()
-        : HttpStatus.INTERNAL_SERVER_ERROR;
 
-    const message =
-      exception instanceof HttpException
-        ? exception.getResponse()
-        : 'Internal server error';
+    const status = this.getStatus(exception);
+    const errorMessage = this.getErrorMessage(exception);
+    const formattedStatus = this.formatStatus(status);
 
     const errorResponse = {
       statusCode: status,
       timestamp: new Date().toISOString(),
       path: request.url,
-      error: message,
+      error:
+        typeof errorMessage === 'string'
+          ? {
+              message: errorMessage,
+              error: formattedStatus,
+              statusCode: status,
+            }
+          : errorMessage,
     };
 
-    // Optionally log the exception
-    console.error(`Error occurred:`, exception);
-
+    console.error('Error occurred:', exception);
     response.status(status).json(errorResponse);
   }
+
+  private getStatus(exception: unknown): HttpStatus {
+    return exception instanceof HttpException
+      ? exception.getStatus()
+      : HttpStatus.INTERNAL_SERVER_ERROR;
+  }
+
+  private getErrorMessage(exception: unknown): string | object {
+    return exception instanceof HttpException
+      ? exception.getResponse()
+      : 'Internal server error';
+  }
+
+  private formatStatus(status: HttpStatus): string {
+    return HttpStatus[status]
+      .toLowerCase()
+      .replace('_', ' ')
+      .split(' ')
+      .map((word) => word.charAt(0).toUpperCase() + word.slice(1))
+      .join(' ');
+  }
 }