This design pattern acts as a bridge between two different interfaces.

TypeScript Design Pattern - Builder

Data validation is one of topics that I am interesting. I always review my code after developed features or fixed bugs. There are many places where need to validate data, it is really terrible. Some cases, we need to validate data input because ensure the data into API, it will not make any problems to crash system.

In this article, I introduce to you how to initialize an Express + TypeScript project.

In the previous post, I showed you how to create a simple S3 bucket. Next, in this article, I will guide you to create a Cognito User Pool.

Before learning React, we should understand Props and State. This is basic for a newbie.

The singleton ensures only a single install is created in a class and provides a method to access this instance everywhere in a codebase.