In this post, we will talk about how to use CORS (Cross-Origin Resource Sharing) in a NestJS application. Before showing, how easy it is to enable CORS, we will cover some fundamentals in this post. What is CORS? What is the NestJS framework? How to use CORS? What is CORS? In a usual…

In this post, we will learn about Spring Cloud Function and will deploy an example of Spring Cloud Function on AWS Lambda. By end of this post, we will have more understanding of serverless functions. If you want to learn more about serverless architecture, this post will get you started. What is Spring Cloud Function? …

In this post, I show how to use pub/sub pattern with the NodeJS application. We will use the Google Cloud Pub/Sub module for building this sample application. What is Pub/Sub? Most architectures used to be synchronous previously. But with the advent of microservices, asynchronous communication is an equal part of the design. Pub/Sub…

Logging is a key part of enterprise applications. Logging not only helps to investigate a problem but also helps to build relevant metrics. These metrics are important from a business perspective. In fact, businesses write service level agreements (SLA) using these metrics. …

In this post, we will discuss how to use Kubernetes and how to deploy your microservice in a Kubernetes cluster. I will cover the fundamentals, so if you are a beginner, this will be a good step-by-step guide to learn Kubernetes. …

What is Spring Cloud? In this post, I will cover Spring Cloud Tutorial for beginners. If you are new to Spring Framework, I will suggest you start with Spring Boot and Microservices and Simplifying Spring Security. As the official documentation on the Spring website says: “ Spring Cloud provides tools…

In this post, I will cover the details of the Liskov Substitution Principle(LSP) with an example. This is a key principle to validate the object-oriented design of your system. Hopefully, you will be able to use this in your design and find out if there are any violations. You can…

In this post, we will discuss how we can build microservices with event-driven architecture. As part of the post, I will also show an example of an event-driven microservice. If you don’t know what a microservice is, you can start with my primer here. Microservices — Event-Driven Architecture Traditionally, we would use a REST…

In this post, I will cover the details of how to use Elasticsearch with Spring Boot. I will also cover the fundamentals of Elasticsearch and how it is used in the industry. What is Elasticsearch? Elasticsearch is a distributed, free and open search and analytics engine for all types of data, including textual…