Cache stores (memory, Redis) in NestJS - Mini Project: Build & Apply

Basic Cache Setup with Memory and Redis in NestJS

📖 Scenario: You are building a simple NestJS service that caches user data to improve response speed. You want to start with an in-memory cache and then add Redis as a cache store for better performance in production.

🎯 Goal: Build a NestJS service that uses the built-in cache module with memory store first, then configure it to use Redis as the cache store.

📋 What You'll Learn

Create a NestJS cache module with in-memory cache

Add a configuration variable for Redis connection URL

Implement Redis cache store using the configuration

Complete the cache module setup to use Redis store

💡 Why This Matters

🌍 Real World

Caching improves app speed by storing frequently accessed data in fast storage like memory or Redis.

💼 Career

Many backend jobs require knowledge of caching strategies and integrating Redis with frameworks like NestJS.

1

Set up NestJS CacheModule with in-memory store

Import CacheModule from @nestjs/common and register it in the AppModule with default in-memory cache by calling CacheModule.register() inside the @Module imports array.

NestJS

import { Module } from '@nestjs/common';
import { CacheModule } from '@nestjs/common';

@Module({
  imports: [
    // Register CacheModule with default in-memory store
  ],
})
export class AppModule {}

Need a hint?

Use CacheModule.register() inside the imports array of @Module.

2

Add Redis connection URL configuration

Create a constant variable called redisUrl and set it to the string 'redis://localhost:6379' to hold the Redis server URL.

NestJS

import { Module } from '@nestjs/common';
import { CacheModule } from '@nestjs/common';

const redisUrl = '';

@Module({
  imports: [CacheModule.register()],
})
export class AppModule {}

// Set redisUrl to Redis server URL

Need a hint?

Define const redisUrl = 'redis://localhost:6379' above the @Module decorator.

3

Configure CacheModule to use Redis store

Import redisStore from cache-manager-redis-store. Update CacheModule.register() to use store: redisStore and url: redisUrl inside the options object.

NestJS

import { Module } from '@nestjs/common';
import { CacheModule } from '@nestjs/common';
import { redisStore } from 'cache-manager-redis-store';

const redisUrl = 'redis://localhost:6379';

@Module({
  imports: [
    // Register CacheModule with Redis store and redisUrl
  ],
})
export class AppModule {}

Need a hint?

Use CacheModule.register({ store: redisStore, url: redisUrl }) in the imports array.

4

Complete CacheModule setup with Redis store

Ensure the AppModule imports array contains CacheModule.register configured with store: redisStore and url: redisUrl. Export the AppModule class.

NestJS

import { Module } from '@nestjs/common';
import { CacheModule } from '@nestjs/common';
import { redisStore } from 'cache-manager-redis-store';

const redisUrl = 'redis://localhost:6379';

@Module({
  imports: [
    CacheModule.register({
      store: redisStore,
      url: redisUrl,
    }),
  ],
})
// Export AppModule

export class AppModule {}

Need a hint?

Make sure the CacheModule.register call includes Redis store and URL, and AppModule is exported.