nestjs-form-data

import { NestFactory } from '@nestjs/core'; import { ValidationPipe, Module, Controller, Post, Body } from '@nestjs/common'; import { NestjsFormDataModule, FormDataRequest, MemoryStoredFile, IsFile, MaxFileSize, HasMimeType } from 'nestjs-form-data'; // 1. Define your DTO for file upload and form fields class UploadAvatarDto { @IsFile() @MaxFileSize(1e6, { message: 'Avatar file size must not exceed 1MB' }) @HasMimeType(['image/jpeg', 'image/png'], { message: 'Avatar must be a JPEG or PNG image' }) avatar: MemoryStoredFile; @Body('userId') userId: string; } // 2. Create your controller @Controller('users') export class UsersController { @Post('avatar') @FormDataRequest() // Apply the decorator to enable form data parsing uploadAvatar(@Body() dto: UploadAvatarDto) { // dto.avatar is now a MemoryStoredFile instance console.log(`User ${dto.userId} uploaded avatar:`); console.log(`Original Name: ${dto.avatar.originalName}`); console.log(`Size: ${dto.avatar.size} bytes`); console.log(`MIME Type: ${dto.avatar.mimeType}`); console.log(`Buffer length: ${dto.avatar.buffer.length}`); // In a real application, you would save dto.avatar.buffer to storage (e.g., S3, local disk) return { message: `Avatar for user ${dto.userId} uploaded successfully!` }; } } // 3. Register the module and global validation pipe @Module({ imports: [ NestjsFormDataModule.config({ is// Enable file system storage by default, or keep MemoryStoredFile as default // storage: FileSystemStoredFile, }), ], controllers: [UsersController], }) export class AppModule {} // 4. Bootstrap your NestJS application async function bootstrap() { const app = await NestFactory.create(AppModule); app.useGlobalPipes( new ValidationPipe({ transform: true, // Crucial for DTO transformation and file object hydration whitelist: true, // Recommended for security forbidNonWhitelisted: true, // Recommended for security }), ); await app.listen(3000); console.log('Application is running on: http://localhost:3000'); } bootstrap();