NestJs Exception Handler

This guide explains how to integrate Lens's exception watcher with your NestJs application to monitor and report exceptions.

Configuration

First, ensure the exceptionWatcherEnabled option is set to true when initializing Lens. This option is enabled by default, but it's good practice to confirm its status in your configuration:

await lens({
  // ... other options
  exceptionWatcherEnabled: true, // Ensure this is true to enable exception watching
});

Verification

To verify that the exception handler is working correctly, you can intentionally throw an exception in one of your routes:

import { Controller, Get, HttpException } from '@nestjs/common';

@Controller()
export class AppController {
  @Get('/error')
  throwError() {
    throw new HttpException('This is an error', 400);
  }
}

After triggering this route, navigate to the Lens /exceptions path in your browser, and you should see the details of the captured exception.