Node.js

What Node.js is

Node.js is a runtime that lets JavaScript run outside the browser, on a server, a build machine or a serverless platform. Before it arrived in 2009, JavaScript only ran in web browsers; Node.js took the same fast engine that powers Chrome and made it available everywhere else, so one language could now run both the front end and the back end of a web application.

That unlocked two big things. First, backends and APIs written in JavaScript: servers that handle requests, process data, talk to databases and connect to other services. Second, the entire ecosystem of build tooling, the bundlers, compilers and formatters that turn modern source code into the fast, optimised sites that reach visitors. Almost every modern web project, ours included, relies on Node.js somewhere.

How HDC uses Node.js

Node.js does the server-side and behind-the-scenes work on our builds. In practice that means:

• We build custom APIs and backends in Node when a site needs logic beyond static pages, handling submissions, processing data, or serving an app feature.
• We use it to power our build tooling: Astro, Vite and the formatters and bundlers that compile and optimise every client site run on Node.
• We use it for integrations, small services that take a form submission and push it into a CRM, trigger an email sequence, or sync data through a webhook.
• We deploy Node logic as serverless and edge functions on platforms like Cloudflare, so it scales without a server to babysit.

We write these backends in TypeScript wherever they’re non-trivial, for the same safety we apply across the stack.

Why we apply it

The value to a business isn’t the runtime itself, it’s what Node lets us join up. A website that captures leads is only half the job; those leads need to reach the CRM, the inbox and the sales team without anyone re-typing them. Node.js is how we build that connective tissue: reliable, fast little services that move data between a site and the tools a business already runs on, so nothing falls through the cracks.

It’s also why our front ends are fast. The build tooling that strips, bundles and optimises a site runs on Node, and that tooling is a big part of how we hit the speed and SEO targets that win clients work.

How Node.js fits our stack

Node.js is the server-side and tooling layer beneath our front ends. It runs the same JavaScript our sites use, written in TypeScript for safety, and powers the Vite and Astro build tooling that compiles every project. When a site needs a backend or an integration, we deploy Node functions to Cloudflare, close to the visitor, so they’re fast and scale automatically. Automation platforms like Zapier and Make often handle the simplest data flows, with custom Node services stepping in when a connection needs more logic than an off-the-shelf tool allows. The result is one coherent, all-JavaScript stack from browser to backend.

When Node.js isn’t the right tool

We’re honest about fit. A purely static marketing site that just needs to load fast and capture leads doesn’t need a Node backend running in production at all, the build tooling does its job and then the site is served as plain files. For a client whose systems already live in a .NET or PHP world, we’ll work in that environment rather than bolting on a Node service for its own sake. And for heavy, CPU-bound processing, a different runtime fits better. Node earns its place when a project needs custom backend logic or integrations, not as a default for every build.