How To Cache MongoDB Data In NestJs Using Redis

Caching is a technique for storing data in memory so that it can be accessed more quickly. This can be a great way to improve the performance of your NestJs application.

There are many different caching solutions available, but one of the most popular is Redis. Redis is an open-source in-memory data structure store that can be used as a cache.

In this article, I will show you how to use Redis to cache MongoDB data in your NestJs application.


To follow along with this tutorial, you will need the following:

Setup a NestJs application

The first step is to setup a NestJs application. If you already have one, skip the step. Follow the article here for a step-by-step NestJs application setup. Or you can run the command below:

Build REST APIs with NestJs and MongoDB

Installing the Dependencies

Once you have all of the prerequisites installed and setup, you can install the dependencies using the following command:

Configure the Cache

Check the Redis is configured properly and working.

Go to command line where Redis is setup and run redis-cli command. It will connect you to Redis server. Now hit ping command. You will get back PONG from Redis server.

Redis Setup Ubuntu

Now configure the Redis Cache in NestJs application. Here is an example of how to configure the cache:

  • store: Pass redisStore as you want your data to be stored in Redis Server
  • host: Redis Server Host Name
  • port: Redis Server Port
  • isGlobal: Pass true in case you want to use Redis Caching in other modules
  • ttl: Time in milliseconds. I have put 5 minutes. My cache will be removed from Redis Server after 5 minutes of creation.

Using Redis Cache in NestJs

Once the cache is configured, we can start using it.

Inject the Cache class from cache-manager package.

Here is an example of how to use the cache in a controller:

Here is an example of how to use redis cache using NestJs decorator in a controller:

Redis Cache Expiration Time (TTL)

In the example above, I have used global TTL for all the redis keys in app.module.ts file. However you can override the value depending upon the use case in any controller function or at controller level.

Here is an example of how to use Redis TTL in NestJs controller using a decorator:

Import CacheTTL from @nestjs/common module. Use CacheTTL decorator just above to a controller function or even at controller level. Pass time in milliseconds. In my example above I have passed 10 minutes.

Check Redis Cache values

Check the Redis Cached values by the custom key. I have used users as key to store my users data. Here is how to check values:

Use keys * to get all the keys stored in Redis server. Use GET <key name> to get the value of a particular key.

Redis Value at Particular Key


Caching is a great way to improve the performance of your NestJS application. In this article, we showed you how to use Redis to cache MongoDB data in your NestJS application.

Checkout some more articles on NestJs here:

Global Error Handling in NestJS: A Comprehensive Guide

Advanced NestJs Techniques: Logging, and Error Handling

Microservices with NestJs and Docker

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