CacheModule setup in NestJS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the CacheModule in NestJS?

CacheModule helps store data temporarily to speed up responses and reduce repeated work, like remembering answers to questions you've already asked.

beginner

How do you import CacheModule globally in a NestJS application?

Use CacheModule.register({ isGlobal: true }) inside the imports array of your root module to make caching available everywhere without re-importing.

beginner

What option do you set to define how long cached data should live in CacheModule?

You set the 'ttl' (time to live) option in seconds, which tells the cache how long to keep data before removing it.

beginner

Show a simple example of CacheModule setup with a 5-minute cache duration.

CacheModule.register({ ttl: 300 }) // 300 seconds = 5 minutes

intermediate

Why might you want to use a cache store like Redis with CacheModule?

Redis stores cache outside your app memory, so cached data stays even if your app restarts, and it can be shared across multiple app instances.

Which method imports CacheModule globally in NestJS?

A CacheModule.setupGlobal()

B CacheModule.forRoot()

C CacheModule.global()

D CacheModule.register({ isGlobal: true })

Use CacheModule.register with isGlobal: true to make cache available app-wide.

What does 'ttl' stand for in CacheModule options?

A Time to live

B Total time limit

C Temporary time lock

D Time to load

'ttl' means how long cached data stays before expiring.

Which cache store is commonly used with CacheModule for persistent caching?

A MySQL

B MongoDB

C Redis

D LocalStorage

Redis is a fast, in-memory store often used for caching.

What happens if you don't set 'ttl' in CacheModule?

A Cache expires immediately

B Cache never expires

C Default ttl is 5 seconds

D Cache is disabled

Without ttl, cached data stays indefinitely until manually cleared.

How do you enable caching in a specific service after importing CacheModule?

A Inject CACHE_MANAGER and use it

B Call CacheModule.enable()

C Use CacheService.start()

D Add @Cacheable decorator

Inject CACHE_MANAGER token to access cache methods in your service.

Explain how to set up CacheModule globally in a NestJS app and why you might want to do this.

Think about making caching easy to use in all parts of your app.

Describe the role of 'ttl' in CacheModule and how it affects cached data.

Consider how long you want your app to remember cached info.