Node.js
Node.js is an open-source runtime environment that lets you run JavaScript outside the web browser — typically on a server. It's built on Google's V8 engine (the same engine that powers Chrome) and uses a non-blocking, event-driven model, which means it can handle thousands of concurrent requests with minimal memory usage. Node.js unifies frontend and backend under a single programming language.
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JavaScript on the server — a development revolution
Before Node.js, developers had to use JavaScript for the frontend and a different language for the backend — PHP, Python, Java, or Ruby. Node.js changed that. Today a single team can write the entire application in JavaScript (or TypeScript), share code between frontend and backend, and use the same tools. That dramatically streamlines development and lowers costs because you don't need two specialised teams.
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Where Node.js is used
Node.js is ideal for real-time applications (chat systems, notifications, collaborative tools), REST and GraphQL APIs, microservices architectures, and data streaming. Companies like Netflix, LinkedIn, Uber, and PayPal use it. In the context of web development, Node.js powers frameworks like Next.js, Express.js, and Fastify. It also forms the basis for developer tooling — npm, webpack, Vite, and others.
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The npm ecosystem
One of the biggest advantages of Node.js is npm (Node Package Manager) — the largest registry of open-source packages in the world, with more than 2 million libraries. Need to process images, send an email, connect to a database, or validate forms? There's almost certainly a proven npm package that handles it. That dramatically speeds up development and reduces the amount of code we have to write from scratch.
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Node.js in our stack
At Appitect, we use Node.js as the foundation for Next.js API Routes, where we process contact forms, send emails, and communicate with external services. Node.js also serves us for developer tooling, build automation, and running tests. Because our entire stack is in TypeScript, we share type definitions between frontend and backend, which eliminates an entire category of errors.
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Practical example
When you fill out the contact form on our website and click send, the request is processed by Node.js on the server. It validates the data, saves the contact to the CRM (Google Sheets), sends an email via the SMTP server, and returns a response — all within hundreds of milliseconds. Thanks to its non-blocking model, Node.js can handle hundreds of such requests simultaneously without slowing down.
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