TOPIC OVERVIEW

NestJS/Providers

Move reusable business logic into injectable classes that NestJS can create and share for you.

15 QuestionsIntermediateHigh Priority ~10 min read

Providers are classes or values that NestJS can manage through its dependency injection system. Services are the most common type of provider, and they are usually where business logic lives.

A provider can be injected into controllers, other providers, or other parts of your application. NestJS also supports custom providers, which lets you control exactly how a dependency is created or what value should be provided.

What you'll walk away knowing

What providers are in NestJS

How services become injectable providers

How providers are registered inside modules

How custom providers can control dependency creation

1What is the shorthand provider syntax in NestJS and what does it expand to?Intermediate 2How does an async provider work in NestJS and what guarantees does it give?Intermediate 3How does NestJS handle async providers and what problem do they solve?Intermediate 4How do you make a provider accessible across the entire module graph using ModuleRef.get() with strict: false?Intermediate 5Walk through all four custom provider types: useClass, useValue, useFactory, useExisting.Intermediate 6How do you create a multi-provider pattern in NestJS to inject multiple implementations for the same token?Intermediate 7What is the difference between useExisting and useClass when aliasing a provider in NestJS?Intermediate 8What is a provider in NestJS?Intermediate 9How do you resolve a circular dependency between two providers in NestJS?Intermediate 10What are provider scopes in NestJS and when would you change the default?Intermediate 11What are the different forms of custom provider syntax in NestJS?Intermediate

All Topics

1

Dependency Injection

2

Request Lifecycle

Exception Handling

3

4

Database and ORM

5

Authentication and Authorization

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