What is the best way to add a header field to a response using NestJS?

Question

What is the best way to add a header field to a response using NestJS?

I am attempting to create a login function in my code, but encountering an issue:

    @Post('login')
    async login(@Body() body: AuthDto, @Res() res: Response) {
        const loginResponse = await this.authService.login(body);
        console.log('loginResponse', loginResponse)
        res.headers.set('x-access-token', loginResponse.access_token)
        return loginResponse
    }

However, I keep getting the following error message:

TypeError: Cannot read property 'set' of undefined

typescript nestjs fastify

Answer 1

Answer №1

There is a more efficient way to handle this:

return res.set({ 'x-access-token': loginResponse.access_token }).json(loginResponse);

I suggest creating an interceptor to handle this logic, specifically checking if the response is valid for the /login path and returning the correct header based on values from loginResponse.

import { Controller, Get, Response } from '@nestjs/common';
import { Response as Res } from 'express';
import { AppService } from './app.service';

@Controller()
export class AppController {
  constructor(private readonly appService: AppService) {}

  @Get()
  getHello(@Response() res: Res): Res {
    return res.set({ 'x-access-token': 1 }).json({ hello: 'world' });
  }

  @Get()
  getHelloAlt(@Response() res: Res): Res {
    return res.set({ 'x-access-token': 1 }).json({ hello: 'world' });
  }
}

This version I am using works well, but it's important to note that I am utilizing the Express Response instead of Nest.js.

EDIT: The type imported from Nest.js/common serves as a decorator function. Consider using no type at all, or import Response from Express.js instead.

Answer 2

There is a more efficient way to handle this:

return res.set({ 'x-access-token': loginResponse.access_token }).json(loginResponse);

I suggest creating an interceptor to handle this logic, specifically checking if the response is valid for the /login path and returning the correct header based on values from loginResponse.

import { Controller, Get, Response } from '@nestjs/common';
import { Response as Res } from 'express';
import { AppService } from './app.service';

@Controller()
export class AppController {
  constructor(private readonly appService: AppService) {}

  @Get()
  getHello(@Response() res: Res): Res {
    return res.set({ 'x-access-token': 1 }).json({ hello: 'world' });
  }

  @Get()
  getHelloAlt(@Response() res: Res): Res {
    return res.set({ 'x-access-token': 1 }).json({ hello: 'world' });
  }
}

This version I am using works well, but it's important to note that I am utilizing the Express Response instead of Nest.js.

EDIT: The type imported from Nest.js/common serves as a decorator function. Consider using no type at all, or import Response from Express.js instead.

Answer 3

Answer №2

If you want to set a custom response header, there are two options available. You can either utilize the @Header() decorator or use a specific response object from a library (and call res.header() directly).

Make sure to import Header from the @nestjs/common package.

@Post()
@Header('Cache-Control', 'none')
create() {
  return 'This method will create a new cat';
}

Answer 4

If you want to set a custom response header, there are two options available. You can either utilize the @Header() decorator or use a specific response object from a library (and call res.header() directly).

Make sure to import Header from the @nestjs/common package.

@Post()
@Header('Cache-Control', 'none')
create() {
  return 'This method will create a new cat';
}

Answer 5

Answer №3

I utilize an interceptor to enhance my service by adding a custom field to the response headers. This interceptor can be set up globally or applied on specific routes as needed.

The file responsible for this functionality is response-add-access-token-to-header.interceptor.ts

import { CallHandler, ExecutionContext, Injectable, NestInterceptor } from '@nestjs/common';
import { Observable } from 'rxjs';

import { Response as ExpressResponse } from 'express';

@Injectable()
export class ResponseAddAccessTokenToHeaderInterceptor implements NestInterceptor {
    intercept(context:ExecutionContext, next:CallHandler): Observable<any> {

        const ResponseObj:ExpressResponse = context.switchToHttp().getResponse();
        ResponseObj.setHeader('x-access-token', 'Your Data' );
        return next.handle();
    }
}

To apply this interceptor globally, make changes in main.ts:

async function bootstrap() {
    const app = await NestFactory.create(AppModule);
    app.useGlobalInterceptors(new ResponseAddAccessTokenToHeaderInterceptor());
    await app.listen(8080);
}
bootstrap();

Answer 6

I utilize an interceptor to enhance my service by adding a custom field to the response headers. This interceptor can be set up globally or applied on specific routes as needed.

The file responsible for this functionality is response-add-access-token-to-header.interceptor.ts

import { CallHandler, ExecutionContext, Injectable, NestInterceptor } from '@nestjs/common';
import { Observable } from 'rxjs';

import { Response as ExpressResponse } from 'express';

@Injectable()
export class ResponseAddAccessTokenToHeaderInterceptor implements NestInterceptor {
    intercept(context:ExecutionContext, next:CallHandler): Observable<any> {

        const ResponseObj:ExpressResponse = context.switchToHttp().getResponse();
        ResponseObj.setHeader('x-access-token', 'Your Data' );
        return next.handle();
    }
}

To apply this interceptor globally, make changes in main.ts:

async function bootstrap() {
    const app = await NestFactory.create(AppModule);
    app.useGlobalInterceptors(new ResponseAddAccessTokenToHeaderInterceptor());
    await app.listen(8080);
}
bootstrap();

Answer 7

Answer №4

When working with Nest, it has the capability to integrate with various HTTP frameworks (like Express by default). If you need to set a header value dynamically, based on run-time conditions, you'll have to utilize the API of your chosen HTTP framework. For instance, if utilizing Express, the code snippet would resemble this:

@Post('login')
async login(@Body() body: AuthDto, @Res() res: Response) {
    const loginResponse = await this.authService.login(body);
    res.header('x-access-token', loginResponse.access_token).json(loginResponse);
}

Nevertheless, in such scenarios, you might lose compatibility with some Nest features that rely on their standard response handling, like Interceptors and decorators such as @HttpCode() or @Header(). To overcome this limitation, you can enable the passthrough option:

@Post('login')
async login(@Body() body: AuthDto, @Res({ passthrough: true }) res: Response) {
    const loginResponse = await this.authService.login(body);
    res.header('x-access-token', loginResponse.access_token);
    return loginResponse;
}

Answer 8

When working with Nest, it has the capability to integrate with various HTTP frameworks (like Express by default). If you need to set a header value dynamically, based on run-time conditions, you'll have to utilize the API of your chosen HTTP framework. For instance, if utilizing Express, the code snippet would resemble this:

@Post('login')
async login(@Body() body: AuthDto, @Res() res: Response) {
    const loginResponse = await this.authService.login(body);
    res.header('x-access-token', loginResponse.access_token).json(loginResponse);
}

Nevertheless, in such scenarios, you might lose compatibility with some Nest features that rely on their standard response handling, like Interceptors and decorators such as @HttpCode() or @Header(). To overcome this limitation, you can enable the passthrough option:

@Post('login')
async login(@Body() body: AuthDto, @Res({ passthrough: true }) res: Response) {
    const loginResponse = await this.authService.login(body);
    res.header('x-access-token', loginResponse.access_token);
    return loginResponse;
}

What is the best way to add a header field to a response using NestJS?

Answer №1

Answer №2

Answer №3

Answer №4

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What is the best way to add a header field to a response using NestJS?

Answer №1

Answer №2

Answer №3

Answer №4

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