We can add caching to return data from the local memory cache instead of querying the database to get the data every time we want to retrieve some data that users request. The good thing about caching is that users can get data faster. However, the data that users get may be outdated. This may also lead to issues when debugging in production environments when something goes wrong as we keep seeing old data.

There are many kinds of caching solutions like Redis, in-memory caching, and more. We can change the way data is cached as our needs change.

For instance, Express has the apicache middleware to add caching to our app without much configuration. We can add a simple in-memory cache into our server like so:

https://stackoverflow.blog/2020/03/02/best-practices-for-rest-api-design/