Request body in NestJS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to extract the request body in a NestJS controller method.

NestJS

import { Controller, Post, [1] } from '@nestjs/common';

@Controller('users')
export class UsersController {
  @Post()
  createUser(@[1]() body: any) {
    return body;
  }
}

Drag options to blanks, or click blank then click option'

AQuery

BParam

CBody

DHeaders

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Param() instead of @Body() to get the request body.

Forgetting to import the correct decorator.

Using @Query() which extracts query parameters, not the body.

The @Body() decorator extracts the request body in a NestJS controller method.

2fill in blank

medium

Complete the code to define a DTO class and use it to type the request body in a NestJS controller.

NestJS

import { Controller, Post, Body } from '@nestjs/common';

class CreateUserDto {
  name: string;
  age: number;
}

@Controller('users')
export class UsersController {
  @Post()
  createUser(@Body() body: [1]) {
    return body;
  }
}

Drag options to blanks, or click blank then click option'

AUser

Bany

CObject

DCreateUserDto

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'any' defeats the purpose of typing the request body.

Using a class name that is not defined.

Using 'Object' which is less specific than the DTO.

Using a DTO class like CreateUserDto helps type the request body for better validation and clarity.

3fill in blank

hard

Fix the error in the code to correctly extract the request body in a NestJS controller method.

NestJS

import { Controller, Post, Body } from '@nestjs/common';

@Controller('products')
export class ProductsController {
  @Post()
  addProduct(@[1] body: any) {
    return body;
  }
}

Drag options to blanks, or click blank then click option'

ABody()

BParam()

CQuery()

DRequest()

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Body without parentheses.

Using other decorators like @Param or @Query incorrectly.

Forgetting to import the decorator.

The @Body() decorator is required to extract the request body; missing parentheses cause errors.

4fill in blank

hard

Fill both blanks to create a POST route that extracts and types the request body using a DTO in NestJS.

NestJS

import { Controller, Post, [1] } from '@nestjs/common';

class UpdateUserDto {
  email: string;
  password: string;
}

@Controller('users')
export class UsersController {
  @Post('update')
  updateUser(@[2]() body: UpdateUserDto) {
    return body;
  }
}

Drag options to blanks, or click blank then click option'

ABody

BParam

CQuery

DHeaders

Attempts:

3 left

💡 Hint

Common Mistakes

Importing the wrong decorator.

Using different decorators for import and parameter.

Forgetting parentheses in the parameter decorator.

The @Body decorator is imported and used to extract the typed request body in the controller method.

5fill in blank

hard

Fill all three blanks to create a NestJS controller method that extracts a typed request body and returns a confirmation message.

NestJS

import { Controller, Post, [1] } from '@nestjs/common';

class CreateOrderDto {
  productId: number;
  quantity: number;
}

@Controller('orders')
export class OrdersController {
  @Post()
  createOrder(@[2]() order: [3]) {
    return `Order for product ${order.productId} with quantity ${order.quantity} received.`;
  }
}

Drag options to blanks, or click blank then click option'

ABody

BCreateOrderDto

COrderDto

DParam

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong DTO class name.

Using @Param instead of @Body.

Not importing the @Body decorator.

Import and use @Body decorator and type the parameter with the correct DTO class CreateOrderDto.