NestJS

Why the framework exists, how modules organise the code of a large application, and which hooks fire while it starts up and shuts down.

1. 1What are modules in NestJS and how do they work?Junior
2. 2What are lifecycle hooks in NestJS?Senior

How the IoC container creates services and manages their scope, how settings are read from environment variables, and how modules are assembled dynamically.

1. 1What are providers and how does dependency injection work in NestJS?Junior
2. 2How to manage configuration in NestJS with configmodule?Junior
3. 3What are Dynamic Modules in NestJS and when to use them?Senior

Handling HTTP requests: routes and their parameters, describing input with DTOs, custom decorators and documenting endpoints with Swagger.

1. 1What are controllers in NestJS?Junior
2. 2What are dtos and how does validation work in NestJS?Junior
3. 3How to create and use custom decorators in NestJS?Middle
4. 4How to document a NestJS API with Swagger?Middle

The order in which middleware, guards, interceptors, pipes and exception filters run around a route handler, and what each stage is responsible for.

1. 1What is middleware in NestJS and how does it differ from guards?Middle
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3. 3What are interceptors in NestJS?Middle
4. 4What are pipes in NestJS?Middle
5. 5What are exception filters in NestJS?Middle

Passport strategies, issuing and verifying JWTs, and restricting access by role on protected routes.

1. 1How to implement authentication with Passport in NestJS?Middle
2. 2How to implement Role-Based Access Control (RBAC) in NestJS?Senior

Wiring up TypeORM, working with entities and repositories, and caching that takes load off the database.

1. 1How does NestJS integrate with TypeORM?Middle
2. 2How to implement caching strategies in NestJS?Middle

Transports beyond REST: GraphQL schemas and resolvers, and two-way messaging through WebSocket gateways.

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2. 2How to implement WebSocket Gateways in NestJS?Middle

Distributed architecture: microservice transports, background job queues and separating commands from queries.

1. 1How do Microservices work in NestJS?Senior
2. 2How to implement queue processing with Bull in NestJS?Senior
3. 3What is CQRS pattern and how to implement it in NestJS?Senior

Unit and end-to-end tests with the Nest testing module: replacing providers with mocks and exercising the fully booted application.

1. 1How to test a NestJS application?Senior