How do you set up TypeORM in a NestJS application?

Q: How do you set up TypeORM in a NestJS application?

// npm i @nestjs/typeorm typeorm pg @Module({ imports: [ TypeOrmModule.forRoot({ type: 'postgres', host: process.env.DB_HOST, port: +process.env.DB_PORT, username: process.env.DB_USER, password: process.env.DB_PASS, database: process.env.DB_NAME, entities: [__dirname + '/**/*.entity{.ts,.js}'], synchronize: false, // NEVER true in production migrations: [__dirname + '/migrations/**/*{.ts,.js}'], }), UsersModule, ], }) export class AppModule {} // Async setup — reads config from ConfigService TypeOrmModule.forRootAsync({ imports: [ConfigModule], useFactory: (config: ConfigService) => ({ type: 'postgres', host: config.get('DB_HOST'), port: config.get ('DB_PORT'), username: config.get('DB_USER'), password: config.get('DB_PASS'), database: config.get('DB_NAME'), entities: [__dirname + '/**/*.entity{.ts,.js}'], synchronize: false, }), inject: [ConfigService], }) synchronize: true auto-migrates the schema on every app start — safe in development only, destructive in production. entities glob — finds all entity files; alternatively pass entity classes directly in an array. Use forRootAsync with ConfigService to read credentials from environment variables safely. migrationsRun: true applies pending migrations on startup — use with caution in production. Register TypeOrmModule.forRoot() once in AppModule; feature modules use forFeature() to register their entities.

Difficulty: 5/10

module configuration, entity registration, database connection

Install @nestjs/typeorm and typeorm, then import TypeOrmModule.forRoot() in AppModule with your database credentials. Set synchronize to false in production and use migrations instead. Use forRootAsync with ConfigService to read credentials from environment variables.

TypeORM setup with sync and async configuration

Key configuration rules:

1
synchronize: true auto-migrates the schema on every app start — safe in development only, destructive in production.
2

How do you set up TypeORM in a NestJS application?

Difficulty: 5/10

module configuration, entity registration, database connection

Install @nestjs/typeorm and typeorm, then import TypeOrmModule.forRoot() in AppModule with your database credentials. Set synchronize to false in production and use migrations instead. Use forRootAsync with ConfigService to read credentials from environment variables.

TypeORM setup with sync and async configuration

Key configuration rules:

1
synchronize: true auto-migrates the schema on every app start — safe in development only, destructive in production.
2

How do you set up TypeORM in a NestJS application?

Install @nestjs/typeorm and typeorm, then import TypeOrmModule.forRoot() in AppModule with your database credentials. Set synchronize to false in production and use migrations instead. Use forRootAsync with ConfigService to read credentials from environment variables.

How do you set up TypeORM in a NestJS application?

Install @nestjs/typeorm and typeorm, then import TypeOrmModule.forRoot() in AppModule with your database credentials. Set synchronize to false in production and use migrations instead. Use forRootAsync with ConfigService to read credentials from environment variables.

Scenario Questions

Follow-up Questions