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Smart contracts are not just static code—they emit events that can be listened to in real-time, enabling dApps to react immediately to on-chain activity. In a modern backend built with NestJS, listening to Ethereum events using Web3.js is a powerful way to automate workflows, trigger actions, or update state based on blockchain transactions.

In this guide, we’ll walk you through how to:

• Connect to the Ethereum blockchain with Web3.js
• Subscribe to smart contract events
• Cleanly handle connections and disconnections
• Integrate the event listener into a NestJS service lifecycle

Artificial Intelligence is evolving rapidly, with models becoming smarter, more capable, and increasingly conversational. But how do these models remember what you told them earlier? How do they maintain context over long interactions or recall relevant details from past sessions? This is where the Model Context Protocol (MCP) comes into play.

In this article, we’ll break down: • What is MCP? • Why MCP is important • How MCP works • Technical structure of a context • Real-world use cases • Limitations and privacy considerations

Every engineer has been here: staring at the same project they helped launch, now bloated and twisted, and muttering the infamous words — “Let’s rewrite it from scratch.”

But why does this keep happening?

Let’s walk through the typical lifecycle of a software project using the clever chart above that maps Impact against Effort over time.

TypeScript is a powerful tool for enhancing JavaScript with strong typing. But like any tool, it can be misused. A common anti-pattern in TypeScript is duplicating types instead of leveraging its utility types. This leads to bloated, harder-to-maintain code.

Let’s explore this with an example and how to improve it by "typing smartly."

Discover the top 10 npm commands every developer should know, with real-world examples and tips. Learn how to manage dependencies, run scripts, improve security, and streamline workflows in your Node.js projects.

Learn the key differences between package.json and package-lock.json, how they impact Node.js projects, and best practices for using them in GitHub Actions. Ensure consistent, reliable builds with real-world examples and actionable tips.

Explore the best Ethereum token standards for real-world asset (RWA) tokenization, including ERC-3643, ERC-1400, ERC-4626, and more. Learn how to implement fractional ownership, compliant transfers, and profit sharing using the right smart contract architecture.

Understanding storage, memory, and calldata in Solidity​

When writing smart contracts in Solidity, understanding data locations—storage, memory, and calldata—is essential. These keywords define where and how data is stored and manipulated, which impacts gas usage, performance, and functionality.

Mongoose, a popular ODM (Object Data Modeling) library for MongoDB in Node.js, provides powerful querying capabilities to work with complex document structures. In this article, we'll explore some advanced querying features in Mongoose, including $elemMatch, aggregation pipelines, and bulkWrite operations. These techniques are essential for building efficient and scalable applications.

A sitemap is an XML file that lists all the important pages of your website, helping search engines like Google index your content more effectively. In Next.js, you can generate a sitemap dynamically using the next-sitemap package. This article will guide you step-by-step on how to set it up.

🚀 Why Do You Need a Sitemap?​

A sitemap improves SEO by:

• Helping search engines discover your pages faster.
• Improving website ranking by ensuring all pages are indexed.
• Allowing control over which pages should be crawled (via robots.txt).