Supercharge Your NestJS App with Redis Cache

Boosting Performance with Redis Cache in NestJS

Performance is the backbone of any successful application. One way to significantly improve an application’s efficiency is by implementing caching. In this article, we’ll explore how to integrate Redis cache into a NestJS application.

What is Caching?

Caching is a temporary storage mechanism that stores frequently accessed data in an easily accessible location, reducing latency and improving performance. To illustrate this concept, imagine having a cup of coffee at your desk instead of having to fetch it from the coffee machine every time you want a sip.

What is Redis?

Redis is an open-source, in-memory data structure store that can be used as a database, cache, message broker, and streaming engine. It provides various data structures, including hashes, sets, strings, lists, bitmaps, and sorted sets.

Implementing Redis Cache in NestJS

To implement Redis cache in a NestJS application, follow these steps:

Prerequisites

• Node.js installed on your computer
• Basic knowledge of JavaScript and Node.js
• NestJS Command Line Interface (CLI) installed on your computer
• Basic understanding of how Nest works

Setting up Redis Cache

1. Install the required packages:
   • node-cache-manager
   • @types/cache-manager
   • cache-manager-redis-store
   • @types/cache-manager-redis-store
2. Configure Redis cache in your NestJS application:
   • Import the CacheModule and call its register() method with your Redis configurations.
   • Inject the CacheManager into your controller.
3. Use the get and set methods to interact with the Redis cache:
   • The get method retrieves items from the cache.
   • The set method adds items to the cache with a specified time to live (TTL).

Automatic Caching using Interceptor

To enable automatic caching for every GET action method in your controller, use the CacheInterceptor. This can be configured globally or customized for specific routes.

Example Code

Here’s an example of how to implement Redis cache in a NestJS application:
“`typescript
import { Controller, Get, UseInterceptors } from ‘@nestjs/common’;
import { CacheInterceptor } from ‘@nestjs/core’;
import { CacheManager } from ‘cache-manager’;

@Controller()
export class AppController {
constructor(private readonly cacheManager: CacheManager) {}

@Get(‘get-number-cache’)
@UseInterceptors(CacheInterceptor)
async getNumberCache(): Promise {
const number = await this.cacheManager.get(‘number’);
if (!number) {
const randomNumber = Math.random();
await this.cacheManager.set(‘number’, randomNumber, 1000);
return randomNumber;
}
return number;
}
}
“
By implementing Redis cache in your NestJS application, you can significantly improve performance and reduce latency. With theCacheInterceptor`, you can easily enable automatic caching for your GET action methods.