Adonis.js v4 example exception handler

example.js

const BaseExceptionHandler = use('BaseExceptionHandler');
const Logger = use('Logger');

class ExceptionHandler extends BaseExceptionHandler {
  async handle(error, { request, response, session, view }) {
    const isJSON = request.accepts(['html', 'json']) === 'json';
    const production = process.env.NODE_ENV === 'production';

    if (error.code === 'E_INVALID_SESSION') {
      session.flash({
        flash_error: 'You have to login/sign up to access this page.'
      });
      await session.commit();
      response.route('login');
      return;
    }

    if (error.code === 'E_VALIDATION_FAILED' && !isJSON) {
      session.withErrors(error.messages).flashAll();
      await session.commit();
      response.redirect('back');
      return;
    }

    // handle if production
    if (production && !isJSON) {
      return response.send(view.render('errors.index', { error }));
    }

    if (isJSON) {
      return response.status(error.status).send({
        code: error.code,
        status: error.status,
        errors: error.messages,
        name: error.name
      });
    }

    // handle all other
    super.handle(...arguments);
  }

  async report(error, {}) {
    if (error.code !== 'E_INVALID_SESSION') {
      Logger.info(error);
    }
  }
}

module.exports = ExceptionHandler;