Modern applications constantly deal with changing data. For example: Instead of repeatedly asking whether something has changed, Kotlin provides a powerful asynchronous data stream API called Kotlin Flow. Kotlin Flow allows you to represent a stream of values that can be collected asynchronously. In this complete beginner’s guide, you’ll learn what Kotlin Flow is, how […]
Spring Boot and PostgreSQL are a popular combination for building reliable and scalable Java backend applications. Spring Boot simplifies application development by providing auto-configuration, dependency injection, web support, and integrations with database technologies. PostgreSQL provides a powerful relational database with strong transactions, constraints, indexing, and advanced SQL features. A typical application architecture looks like this: […]
Node.js and PostgreSQL are a powerful combination for building modern backend applications. Node.js provides a fast, event-driven runtime for JavaScript, while PostgreSQL provides a reliable relational database for storing and querying application data. A typical backend architecture looks like this: Whether you’re building a REST API, SaaS application, e-commerce platform, dashboard, or internal business system, […]
Modern mobile applications need to store data locally for many different reasons. An application may need to remember: In a Kotlin Multiplatform (KMP) application, local storage becomes especially important because Android and iOS use different native storage technologies. Android commonly uses technologies such as DataStore, while iOS provides storage mechanisms such as UserDefaults and Keychain. […]
When working with PostgreSQL, data is often stored across multiple tables. For example, an e-commerce application might have separate tables for: But what if you want to retrieve information from multiple tables in a single query? That’s where JOINs come in. A PostgreSQL JOIN combines rows from two or more tables based on a related […]
Authentication is one of the most important parts of a modern mobile application. Whether you are building an e-commerce app, booking platform, social media application, education platform, banking application, or business management system, users often need to log in before accessing protected features. With Kotlin Multiplatform (KMP), you can share a large part of your […]
PostgreSQL is known for its powerful relational database features, but it also provides excellent support for storing and querying JSON data. If you’re working with PostgreSQL, you’ll commonly encounter two JSON-related data types: At first, they may look almost identical. Both can store JSON documents, objects, arrays, and other valid JSON values. However, JSON and […]
As a PostgreSQL database grows, queries that were once fast can become slower. For example, this query may work quickly with a few hundred rows: But if the users table contains millions of records, PostgreSQL may need to inspect a large number of rows to find the matching record. This is where indexes become important. […]
Modern mobile applications depend heavily on APIs to communicate with backend servers. Whether you are building an e-commerce application, social media app, booking platform, financial application, or business management system, your mobile application usually needs to: With Kotlin Multiplatform (KMP), developers can share networking and API-related code between platforms such as Android and iOS. One […]
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