Nest: How to customise Nest default error handler?

[chanlito]

Example: throw new Error('Boom');

All I get for response is the following:

{
    "statusCode": 500,
    "message": "Internal server error"
}

• What if i want to print the stack trace too in the above response while in development?
• How would I do that?

In express we have this

app.use(function (err, req, res, next) {
  // logic
})

What about nest?

I read the docs, but it only catches http errors.

[adrien2p]

hey you can have a look on this : https://github.com/adrien2p/nest-js-sequelize-jwt/blob/master/src/modules/common/filters/DispatchError.ts
and documentation : https://docs.nestjs.com/exception-filters

[chanlito]

I see, thanks.

[claudiuchis]

Here is an example which catches any error, and renders templates for certain errors.
By the way, as of nest 5.0.0, the 2nd param for the catch method is an ArgumentsHost object, which encapsulates the response object.

# errors.filter.ts
import { ExceptionFilter, Catch, HttpException, ArgumentsHost, HttpStatus } from '@nestjs/common';

@Catch()
export class ErrorFilter implements ExceptionFilter {
  catch(error: Error, host: ArgumentsHost) {
    let response = host.switchToHttp().getResponse();
    let status = (error instanceof HttpException) ? error.getStatus(): HttpStatus.INTERNAL_SERVER_ERROR;

    if (status === HttpStatus.UNAUTHORIZED) 
        return response.status(status).render('views/401');
    if (status === HttpStatus.NOT_FOUND) 
        return response.status(status).render('views/404');
    if (status === HttpStatus.INTERNAL_SERVER_ERROR) {
        if (process.env.NODE_ENV === 'production') {
          console.error(error.stack);
          return response.status(status).render('views/500');
        }
        else {
          let message = error.stack;
          return response.status(status).send(message); 
        } 
    }
  }
}

# main.ts
import { NestFactory } from '@nestjs/core';
import { ApplicationModule } from './app.module';
import { ErrorFilter } from './app/errors/error.filter';

async function bootstrap() {
  const app = await NestFactory.create(ApplicationModule);

  app.useStaticAssets(__dirname + '/public');
  app.setBaseViewsDir(__dirname + '/views');
  app.setViewEngine('ejs');
  app.useGlobalFilters(new ErrorFilter())

  await app.listen(3000);
}
bootstrap();

[lock[bot]]

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