Exception Filter Example - Nestjs Typing CST Test

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Exception Filter Example — Nestjs Code

A custom exception filter catching HTTP errors.

import { ExceptionFilter, Catch, ArgumentsHost, HttpException, Module } from '@nestjs/common';
import { NestFactory } from '@nestjs/core';
import { Controller, Get } from '@nestjs/common';

@Catch(HttpException)
class HttpErrorFilter implements ExceptionFilter {
	catch(exception: HttpException, host: ArgumentsHost) {
		const ctx = host.switchToHttp();
		const response = ctx.getResponse();
		response.status(exception.getStatus()).json({ message: exception.message });
	}
}

@Controller()
class AppController {
	@Get('error') throwError() { throw new HttpException('Custom error', 400); }
}

@Module({ controllers: [AppController] })
class AppModule {}

async function bootstrap() {
	const app = await NestFactory.create(AppModule);
	app.useGlobalFilters(new HttpErrorFilter());
	await app.listen(3000);
}
bootstrap();

Nestjs Language Guide

NestJS is a progressive Node.js framework for building efficient, scalable, and maintainable server-side applications using TypeScript and modern JavaScript.

Primary Use Cases

▸Building RESTful APIs and GraphQL services
▸Creating microservices with built-in support
▸Developing server-side applications with TypeScript
▸Implementing real-time WebSocket applications
▸Building enterprise-grade backend systems

Notable Features

▸TypeScript-first design
▸Modular architecture
▸Dependency Injection container
▸Support for REST, GraphQL, WebSockets, and microservices
▸Built-in testing and CLI tools

Origin & Creator

NestJS was created by Kamil Myśliwiec in 2017 to provide a structured framework for building maintainable Node.js server-side applications with TypeScript.

Industrial Note

NestJS is popular in enterprise backend ecosystems and microservice architectures, providing scalable, modular, and maintainable server-side solutions.

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Exception Filter Example — Nestjs Code

A custom exception filter catching HTTP errors.

import { ExceptionFilter, Catch, ArgumentsHost, HttpException, Module } from '@nestjs/common'; import { NestFactory } from '@nestjs/core'; import { Controller, Get } from '@nestjs/common'; @Catch(HttpException) class HttpErrorFilter implements ExceptionFilter { catch(exception: HttpException, host: ArgumentsHost) { const ctx = host.switchToHttp(); const response = ctx.getResponse(); response.status(exception.getStatus()).json({ message: exception.message }); } } @Controller() class AppController { @Get('error') throwError() { throw new HttpException('Custom error', 400); } } @Module({ controllers: [AppController] }) class AppModule {} async function bootstrap() { const app = await NestFactory.create(AppModule); app.useGlobalFilters(new HttpErrorFilter()); await app.listen(3000); } bootstrap();

Nestjs Language Guide

NestJS is a progressive Node.js framework for building efficient, scalable, and maintainable server-side applications using TypeScript and modern JavaScript.

Primary Use Cases

▸Building RESTful APIs and GraphQL services
▸Creating microservices with built-in support
▸Developing server-side applications with TypeScript
▸Implementing real-time WebSocket applications
▸Building enterprise-grade backend systems

Notable Features

▸TypeScript-first design
▸Modular architecture
▸Dependency Injection container
▸Support for REST, GraphQL, WebSockets, and microservices
▸Built-in testing and CLI tools

Origin & Creator

NestJS was created by Kamil Myśliwiec in 2017 to provide a structured framework for building maintainable Node.js server-side applications with TypeScript.

Industrial Note

NestJS is popular in enterprise backend ecosystems and microservice architectures, providing scalable, modular, and maintainable server-side solutions.