NestJS and TypeORM in 2026: Migrations, Relations and Interview Questions
Master NestJS TypeORM integration with TypeORM 1.0 migrations, entity relations, repository patterns and common interview questions for backend developers.
Node.js / NestJS
BACKEND
Backend development with Node.js runtime and NestJS TypeScript-first framework. Modular architecture with decorators, dependency injection and full TypeScript support for building highly maintainable REST APIs, GraphQL and enterprise-grade microservices.
What you'll learn
NestJS framework with modular architecture and decorators (@Controller, @Injectable)
Strict TypeScript with advanced types and automatic inference
Native Dependency Injection with IoC container and scopes
Controllers, Providers, Modules for clear code organization
Guards for authentication, Pipes for validation, Interceptors for transformation
TypeORM or Prisma for ORM with migrations and complex relationships
Integrated Passport.js for auth strategies (JWT, OAuth2, local)
GraphQL with code-first or schema-first approach
Microservices with transport layers (TCP, Redis, gRPC, MQTT)
Comprehensive testing (Jest, E2E, unit tests, mocking, coverage)
Key topics to master
The most important concepts to understand this technology and ace your interviews
1
Node.js: Event Loop, non-blocking I/O, async/await, streams, buffers
2
NestJS architecture: modules, controllers, providers, decorators
3
Dependency Injection: providers, scopes (DEFAULT, REQUEST, TRANSIENT), custom providers
4
Controllers and routing: @Get, @Post, @Param, @Body, @Query, route params
5
Providers and services: business logic, repository pattern, service layer
6
Middleware, Guards, Interceptors, Pipes, ExceptionFilters (request lifecycle)
7
Validation with class-validator and class-transformer (DTO validation)
8
TypeORM: entities, relations (@OneToMany, @ManyToOne), repositories, QueryBuilder
9
Prisma: schema, migrations, client, relations, transactions
10
Authentication: Passport.js, JWT strategy, guards, role-based access control
11
Configuration: ConfigModule, environment variables, validation
12
Exception handling: HttpException, custom exceptions, filters
13
Testing: unit tests with Jest, E2E tests, mocking, test doubles
14
GraphQL: resolvers, schemas, mutations, subscriptions, DataLoader
15
Microservices: patterns (request-response, event-based), transporters
16
Performance: caching (Redis), compression, rate limiting, profiling
17
Logging (Winston, Pino), monitoring, Docker, deployment
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