Is it possible to send error codes in nestjs other than 200? I attempted to inject the response object into a method, but could not find a way to send an error.
save(@Body() body: any, @Res() response: Response): string {
console.log("posting...")
console.log(body)
return "saving " + JSON.stringify(body)
}
The code above sends the body with a status code in the 20X range, but I need to be able to send different status codes like 400 or 500.
It is recommended to implement exception filters in your scenario.
For this specific situation, you should consider the following:
throw new CustomErrorException(error);
Alternatively, you could also use
throw new HttpException('Unauthorized', HttpStatus.UNAUTHORIZED);
This will result in
{
"statusCode": 401,
"message": "Unauthorized"
}
More information can be found in the documentation: https://docs.nestjs.com/exception-filters
Here's a great example of how you can return an http status code in NestJS without throwing errors or using the static @HttpCode():
import { Post, Res, HttpStatus } from '@nestjs/common';
import { Response } from 'express';
...
@Post()
save(@Res() response: Response) {
response
.status(HttpStatus.BAD_REQUEST)
.send("saving " + JSON.stringify(body));
}
To achieve this, you just need to utilize the @Res() decorator to access the underlying express Response object and use its status() method.
I do wonder if there's a cleaner way to achieve this in NestJS without manipulating stateful objects, similar to how it's done in Spring framework...
Your response will display any code you write
@HttpCode(204)
create() {
return 'This function creates a new dog';
}
If you want to send a specific status code in nestjs, make sure to include the @Res() parameter in your method. By default, the passthrough option is set to false in nestjs, meaning that any changes made will not reflect in the Response object.
A common mistake is returning the response object directly, which can lead to errors like:
Cannot set headers after they are sent to the client
Remember to set the status code before sending the response, as it will default to 200 if not specified:
async myfunction(@Param('id') id: string, @Res({passthrough: true}) response: Response) {
//do something ....
response.status(HttpStatus.FORBIDDEN).send('You are not allowed to do that');
return;
}
Upon testing in Postman, it was observed that the following code functions properly, despite appearing somewhat unconventional:
import { Post, Res, HttpStatus, Controller } from '@nestjs/common';
import { Response } from 'express';
@Controller()
export class AppController {
constructor(private readonly appService: AppService) {}
@Get()
getHello(@Res({ passthrough: true }) res: Response): string {
res.status(203);
return this.appService.getHello();
}
}
This snippet utilizes Response::status from @nests/common, which is marked as readonly and not callable. Hence, resorting to utilizing Response from express becomes necessary.
If you ever find yourself in a situation where you need to handle an error, consider throwing an Error and allowing Nest to manage the error code for you. The documentation provides detailed information on pre-defined errors that correspond with common HTTP status codes. Alternatively, you can create your own custom errors by following the syntax outlined in the docs.
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