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Exploring Node.js Architecture

Exploring Node.js Architecture

17 Jul 2025
Beginner
17.6K Views
2 min read
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Node.js has mainly two types of components – core components and node.js API (modules). The core components are written in C and C++, and node.js API are written in JavaScript.

If you want to go further and learn Node.js in depth, you can enroll in a Free Node.js Course With Certification. This is a great opportunity to grow your skills and add a certificate to your portfolio.

Diagram for Node.js architecture is given below:

Read More - Node JS Interview Questions for Experienced

Node.js Interview question

  1. Node.js API

    These are written in JavaScript and directly exposed to outer world to interact with Node.js internal components. Node.js Binding – These are Core API, which bind the JavaScript with C / C++ libraries.

  2. C/C++ Add-ons

    You can also develop your Node.js Add-ons using C/C++ to work with Node.js.

  3. V8

    It is Google’s open source JavaScript engine, written in C++. Actually, it is a JavaScript VM which compile the JavaScript code into native machine code instead interpretation. It is the fastest JIT (Just-In-Time) compiler for JavaScript.

  4. Libuv

    It is a multi-platform support C++ library which is responsible for handling thread pool, event loop and async I/O operations in Node.js. In Node.js, blocking I/O operations are delegated to Libuv modules which has a fixed size C++ thread pool to handle these operations. When these operations are completed, they are notified to Event loop.

  5. C-ares

    It is a C library for handling async DNS request, name resolves and multiple DNS queries in parallel.

  6. http_parser

    It is a C library for parsing HTTP request and response.

  7. OpenSSL

    It is a C library for the implementation of Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols. It also provides all the necessary cryptography methods like hash, cipher, decipher, sign and verify etc.

  8. Zlib

    It is a C library for data compression and decompression.

What do you think?

I hope you get the idea of Node.js internal structure. I would like to have feedback from my blog readers. Your valuable feedback, question, or comments about this article are always welcome.

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About Author
Shailendra Chauhan (Microsoft MVP, Founder & CEO at ScholarHat)

Shailendra Chauhan, Founder and CEO of ScholarHat by DotNetTricks, is a renowned expert in System Design, Software Architecture, Azure Cloud, .NET, Angular, React, Node.js, Microservices, DevOps, and Cross-Platform Mobile App Development. His skill set extends into emerging fields like Data Science, Python, Azure AI/ML, and Generative AI, making him a well-rounded expert who bridges traditional development frameworks with cutting-edge advancements. Recognized as a Microsoft Most Valuable Professional (MVP) for an impressive 9 consecutive years (2016–2024), he has consistently demonstrated excellence in delivering impactful solutions and inspiring learners.

Shailendra’s unique, hands-on training programs and bestselling books have empowered thousands of professionals to excel in their careers and crack tough interviews. A visionary leader, he continues to revolutionize technology education with his innovative approach.
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