Systems | Development | Analytics | API | Testing

In an API-driven setup, a gateway often sits between clients and backend services: it can validate input, aggregate upstream responses, and give you one place to observe traffic. Koa is a strong fit for that role. Its core stays small, async/await is first-class, and middleware composes in a predictable stack. In this article, you will build a compact API gateway with Koa that: You will also wire up AppSignal for the Node.js stack.

Node.js v26.0.0 is officially out. This release focuses on modernizing the platform, with four key changes: No noise — these are the real headlines.

How runtime intelligence, platform engineering, and AI-native workflows are shifting operations to developer workflows. Highlighted by NodeSource extending its Diagnostics and Security Runtime Observability solution into the IDE.

Debugging has always been part of the craft. But in today’s systems — distributed, asynchronous, and increasingly opaque — debugging is no longer just difficult. It’s fragmented. Despite better tooling, more telemetry, and the rise of AI-assisted workflows, many developers still experience the same core frustrations when trying to understand what’s actually happening in production.

If you’ve ever debugged a Node.js application in production, you’ve likely seen this: Sourcemaps were supposed to solve this. And technically, they do. But in practice, most teams still struggle to make sourcemaps available when they’re actually needed.

If you’ve worked with Node.js in production, you already know that streams are not a niche feature. They are part of the foundation. They power how data moves through systems, how I/O is handled, and ultimately, how applications scale. For years, that foundation has held up remarkably well. At the same time, many developers—junior and senior alike—have shared a similar feeling: while streams are powerful, they don’t always feel natural to work with.

On March 31, 2026, security researcher Chaofan Shou noticed something odd: the complete source code of Claude Code — Anthropic's flagship AI coding CLI — was sitting in plain sight on the public npm registry. 512,000 lines of TypeScript. 59.8 MB of source maps. Everything. The irony? The code contains an "Undercover Mode" specifically built to prevent internal Anthropic secrets from leaking into public commits. They built a secrecy subsystem, then accidentally published everything.

In today’s ecosystem, building with Node.js is not just about writing code. It’s about running systems that are reliable, secure, and able to evolve over time. That’s where collaboration at the foundation level becomes critical. At NodeSource, working closely with the OpenJS Foundation is not just a partnership. It’s a commitment to the long-term health, security, and evolution of the Node.js ecosystem.

There’s something powerful about stepping away from your day-to-day work and being surrounded by people asking the same questions you’ve been thinking about: At JSConf Spain, those answers don’t come from a single talk. They emerge from patterns — ideas that repeat across different speakers, different companies, and different perspectives.

Today marks a critical step forward for enterprise Node.js. In partnership with the OpenJS Foundation, NodeSource is launching a Node.js LTS Upgrade & Modernization program to provide companies with a secure and streamlined path to migrate business-critical applications off legacy and End-of-Life (EOL) Node.js versions and onto the latest Long-Term Support (LTS) releases.