diff --git a/src/app.controller.spec.ts b/src/app.controller.spec.ts
new file mode 100644
index 0000000..d22f389
--- /dev/null
+++ b/src/app.controller.spec.ts
@@ -0,0 +1,22 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { AppController } from './app.controller';
+import { AppService } from './app.service';
+
+describe('AppController', () => {
+  let appController: AppController;
+
+  beforeEach(async () => {
+    const app: TestingModule = await Test.createTestingModule({
+      controllers: [AppController],
+      providers: [AppService],
+    }).compile();
+
+    appController = app.get<AppController>(AppController);
+  });
+
+  describe('root', () => {
+    it('should return "Hello World!"', () => {
+      expect(appController.getHello()).toBe('Hello World!');
+    });
+  });
+});
diff --git a/src/app.controller.ts b/src/app.controller.ts
new file mode 100644
index 0000000..cce879e
--- /dev/null
+++ b/src/app.controller.ts
@@ -0,0 +1,12 @@
+import { Controller, Get } from '@nestjs/common';
+import { AppService } from './app.service';
+
+@Controller()
+export class AppController {
+  constructor(private readonly appService: AppService) {}
+
+  @Get()
+  getHello(): string {
+    return this.appService.getHello();
+  }
+}
diff --git a/src/app.module.ts b/src/app.module.ts
new file mode 100644
index 0000000..d4e1f86
--- /dev/null
+++ b/src/app.module.ts
@@ -0,0 +1,31 @@
+import { Module } from '@nestjs/common';
+import { ConfigModule } from '@nestjs/config';
+import { PrismaModule } from './prisma/prisma.module';
+import { AppController } from './app.controller';
+import { AppService } from './app.service';
+import { SitesModule } from './sites/sites.module';
+import { MachinesModule } from './machines/machines.module';
+import { ComposantsModule } from './composants/composants.module';
+import { PiecesModule } from './pieces/pieces.module';
+import { DocumentsModule } from './documents/documents.module';
+import { TypesModule } from './types/types.module';
+import { CustomFieldsModule } from './custom-fields/custom-fields.module';
+
+@Module({
+  imports: [
+    ConfigModule.forRoot({
+      isGlobal: true,
+    }),
+    PrismaModule,
+    SitesModule,
+    MachinesModule,
+    ComposantsModule,
+    PiecesModule,
+    DocumentsModule,
+    TypesModule,
+    CustomFieldsModule,
+  ],
+  controllers: [AppController],
+  providers: [AppService],
+})
+export class AppModule {}
diff --git a/src/app.service.ts b/src/app.service.ts
new file mode 100644
index 0000000..927d7cc
--- /dev/null
+++ b/src/app.service.ts
@@ -0,0 +1,8 @@
+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class AppService {
+  getHello(): string {
+    return 'Hello World!';
+  }
+}
diff --git a/src/main.ts b/src/main.ts
new file mode 100644
index 0000000..ddfd7f6
--- /dev/null
+++ b/src/main.ts
@@ -0,0 +1,30 @@
+import { NestFactory } from '@nestjs/core';
+import { ValidationPipe } from '@nestjs/common';
+import { AppModule } from './app.module';
+
+async function bootstrap() {
+  const app = await NestFactory.create(AppModule);
+  
+  // Configuration CORS
+  app.enableCors({
+    origin: process.env.CORS_ORIGIN || 'http://localhost:3001',
+    credentials: true,
+  });
+
+  // Configuration de la validation globale
+  app.useGlobalPipes(new ValidationPipe({
+    whitelist: process.env.VALIDATION_WHITELIST === 'true',
+    forbidNonWhitelisted: process.env.VALIDATION_FORBID_NON_WHITELISTED === 'true',
+    transform: process.env.VALIDATION_TRANSFORM === 'true',
+  }));
+
+  // Préfixe global pour l'API
+  const apiPrefix = process.env.API_PREFIX || 'api';
+  app.setGlobalPrefix(apiPrefix);
+
+  const port = process.env.PORT || 3000;
+  await app.listen(port);
+  console.log(`Application is running on: http://localhost:${port}`);
+  console.log(`Environment: ${process.env.NODE_ENV || 'development'}`);
+}
+bootstrap();
diff --git a/src/prisma/prisma.module.ts b/src/prisma/prisma.module.ts
new file mode 100644
index 0000000..68092fe
--- /dev/null
+++ b/src/prisma/prisma.module.ts
@@ -0,0 +1,9 @@
+import { Global, Module } from '@nestjs/common';
+import { PrismaService } from './prisma.service';
+
+@Global()
+@Module({
+  providers: [PrismaService],
+  exports: [PrismaService],
+})
+export class PrismaModule {} 
\ No newline at end of file
diff --git a/src/prisma/prisma.service.ts b/src/prisma/prisma.service.ts
new file mode 100644
index 0000000..d6c54bb
--- /dev/null
+++ b/src/prisma/prisma.service.ts
@@ -0,0 +1,19 @@
+import { Injectable, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
+import { PrismaClient } from '@prisma/client';
+
+@Injectable()
+export class PrismaService extends PrismaClient implements OnModuleInit, OnModuleDestroy {
+  constructor() {
+    super({
+      log: ['query', 'info', 'warn', 'error'],
+    });
+  }
+
+  async onModuleInit() {
+    await this.$connect();
+  }
+
+  async onModuleDestroy() {
+    await this.$disconnect();
+  }
+} 
\ No newline at end of file