Redis is a fast and reliable key-value store. It keeps the data in its memory, although Redis, by default, writes the data to the file system at least every 2 seconds. In the previous part of this series, we’ve used a cache stored in our application’s memory. While it is simple and efficient, it has […]
There are quite a few things we can do when tackling our application’s performance. We sometimes can make our code faster and optimize the database queries. To make our API even more performant, we might want to completely avoid running some of the code. Accessing the data stored in the database is quite often time-consuming. […]
So far, in this series, we’ve used PostgreSQL to store data structured in columns. This approach has many benefits, but sometimes, we want some more flexibility, though. Chances are you already know JSON and use it in your web applications. There are databases like MongoDB that store JSON-like documents. With this approach, we can describe […]
So far, in our application, we’ve been following a pattern of controllers using services to access and modify the data. While it is a very valid approach, there are other possibilities to look into. NestJS suggests command-query responsibility segregation (CQRS). In this article, we look into this concept and implement it into our application. Instead of keeping […]
With NestJS, we have quite a few transport layer implementations prepared for microservices. Among them, the gRPC transporter is definitely one of the most interesting. In this article, we explore the idea and implement it with NestJS. gRPC is, at its core, a Remote Procedure Call (RPC) framework. Its main idea revolves around creating services […]
JavaScript NestJS TypeScript Uncategorized
NestJS subscribes to the idea that a microservice is an application that uses a different transport layer than HTTP. Therefore, in the previous part of this series, we’ve used TCP. However, with NestJS, we have a broad selection of transporters that transmit messages across microservices. Each one of them is different, and it is worth exploring […]
As our application grows, maintaining it might become more challenging. One of the approaches that we can take is to structure our app with microservices. You can find the code for the microservice we create in this article in this repository. The rest of the code can still be found in the repository of our […]
As our database grows, so do the results of our queries. Returning a lot of data in our API might not be the best approach performance-wise. Dividing our content into multiple pages and solutions like infinite scrolling have been around for quite some time. In this article, we explore ways of implementing pagination and point […]
JavaScript NestJS SQL TypeScript
Storing arrays is not an obvious thing in the world of SQL databases. Solutions such as MySQL, MariaDB, or Microsoft SQL Server don’t have a straightforward column type for arrays. This article explores how the array data type works in PostgreSQL both through SQL queries and through TypeORM. By learning how to operate on arrays […]
One of the important concepts to understand when dealing with databases is a transaction. It is a unit of work that we treat as a whole. It either happens fully or not happens at all. To emphasize the importance of transactions, let’s use an example that makes the data loss especially painful. When transferring money […]
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