Learning Express.js Properly: Part2 Engine Internal Working Principles and Clone Project

Name: Learning Express.js Properly: Part2 Engine Internal Working Principles and Clone Project
Price: 23100 KRW
Rating: 4 (3 reviews)

This course goes beyond just using Express.js—you'll implement its internal engine from scratch to truly understand how real servers work. You'll gain hands-on experience growing as a server developer by building all of Express's components from the ground up, including routers, middleware, request-response objects, static file handling, and template rendering.

(4.0) 3 reviews

28 learners

Level Basic

Course period Unlimited

nhcodingstudio

JavaScript

Node.js

Express

backend

software-design

JavaScript

Node.js

Express

backend

software-design

What you will gain after the course

How to fundamentally understand the core principles of web server architecture by implementing Express.js
How to Fully Understand the Inner Workings by Implementing the Entire Express.js Architecture from Scratch
How the middleware chain and next() function pass requests and continue the control flow
A structural analysis of how request (req) and response (res) objects are actually composed and passed
How to implement a static file server in a secure manner
Implement stream-based logic that directly parses JSON and URL-Encoded request bodies
How to design a RESTful router from scratch and build a complete CRUD API
Implement a structure that separates the router into modules like express.Router() and connects it with the main app
How to integrate EJS template engine to render dynamic HTML
Implementing a structure to safely handle synchronous/asynchronous errors within the middleware chain
How to verify overall server functionality and perform integration testing through automated API test scripts

🚀From "User" to "Implementer" – Core Server Development Principles Learned by Cloning Express.js

This course takes you on a journey to directly clone the engine of Express.js, the most widely used server framework in the web ecosystem, and implement its internal working principles.

I remember when I first learned Node.js and Express. It was truly impressive how routing, middleware, static file handling, and template rendering could be easily implemented with just a single line of methods like app.get() or app.use(). But at some point, the question came to mind: "Am I someone who knows how to build this, or am I just someone who uses it?"

Express is a very convenient tool, but its internal structure is hidden to that extent, making it often difficult to understand the principles by which it operates. This course was created to quench that thirst.

How is the routing system designed, why do middlewares execute in order, and how are MIME types set for static files? The process of finding answers by directly implementing and practicing all these questions is the core of this course.

By implementing Express yourself, you'll go beyond just knowing Express and gain an essential sense of server development that allows you to naturally understand the structure of other frameworks like Fastify, Flask, Django, and Spring Boot.

It's not just about knowing 'how to use it', but a journey to grow into someone who can design and implement how servers work on their own—let's start together now!

The characteristics of this course

📌An engine clone project-based course where you directly implement all core structures of Express.js - tự tay triển khai toàn bộ cấu trúc cốt lõi của Express.js

📌Visualizing and explaining how things work line by line without abstract concepts

📌 Detailed implementation of security handling and error handling that can be usefully applied in real-world practice

📌All course materials and test code provided, learn by running them yourself

📌 Grow from a developer who simply uses to a server developer who knows how to build

After completing this course

You will gain the ability to design and implement the entire web server process from scratch without Express.js.
You will gain a complete understanding of the flow from HTTP request to response in Node.js at the code level.
By implementing core practical features one by one—such as routing, middleware chains, request parsing, and static file serving—you'll gain a fundamental understanding of server development.
By understanding the internal workings of server frameworks, you'll naturally connect with the design philosophies of other frameworks like Fastify, NestJS, Django, and Spring Boot.
You'll develop the ability to break down complex features into smaller units, modularize them, and refactor them into a maintainable structure.
You'll be able to understand and explain not just Express.js, but the structure itself of how a web server engine receives requests and processes responses at the design level.
The course deliverable itself becomes a portfolio piece, and you can specify on your application that you directly implemented an 'Express.js clone project'.

createApplication Function Design
Configure the starting point of the app object and design the core controller structure that includes configuration storage, router, and middleware registration functionality. This allows a single app instance to drive the entire server. và thiết kế cấu trúc bộ điều khiển cốt lõi bao gồm kho lưu trữ cấu hình, router và chức năng đăng ký middleware. Nhờ đó, một instance ứng dụng có thể điều khiển toàn bộ server.

Implementing Middleware Chain

Directly implement the middleware sequential execution flow using next(), visualize the structure where each middleware intercepts and processes requests, and grasp the fundamental concepts. It is designed to be systematically understood through an analogy to a hospital treatment flow., trực quan hóa cấu trúc mà mỗi middleware chặn và xử lý yêu cầu, từ đó nắm vững khái niệm cơ bản. Được thiết kế để có thể hiểu một cách có hệ thống thông qua việc so sánh với quy trình khám chữa bệnh tại bệnh viện.

Architecture Improvements

Using the Singleton pattern and IIFE, we implement an architectural structure that prevents global state sharing, encapsulates configuration values and internal modules, and enhances security. Additionally, through middleware integration and structural separation, we improve it into an engine with production-level maintainability and scalability. để ngăn chặn chia sẻ trạng thái toàn cục, ẩn giấu các giá trị cấu hình và module nội bộ, đồng thời tăng cường bảo mật. Ngoài ra, cải thiện thành engine có khả năng bảo trì và mở rộng ở mức độ thực tế thông qua tích hợp middleware và tách biệt cấu trúc.

Prerequisites and Important Notes

You should be familiar with basic JavaScript syntax. Understanding of variable declaration, function definition, array/object manipulation, and asynchronous processing (Promise, etc.) is required.
It would be helpful to have a basic understanding of Node.js environment setup and module systems (such as CommonJS). It will be easier if you're familiar with running local servers and the roles of require and module.exports.
If you have experience using Express.js, you'll be able to understand the core concepts much faster. This course focuses not on simple usage, but on directly implementing the underlying principles., bạn sẽ có thể hiểu được cốt lõi nhanh hơn rất nhiều. Khóa học này không tập trung vào cách sử dụng đơn thuần, mà tập trung vào việc trực tiếp triển khai nguyên lý hoạt động.
This course is not about providing completed code or packages, but focuses on the process of implementing from scratch. You will learn the structure and principles by writing code with your own hands.
It is recommended that you take the 'Learn Express.js Properly: Part 1 From Basics to Advanced [Fundamentals]' course first. That course covers the basic structure and usage of Express.js first, and this course is an advanced program that builds upon it to implement the internal structure.

Recommended for
these people

Who is this course right for?

Developers who want to grow beyond just having used Express.js to the next level
Backend development aspirant who wants to accurately understand the internal workings of servers
Learners who want to learn by directly implementing the structural concepts of web frameworks
A job seeker looking for a meaningful clone project to include in their portfolio
Developers with experience in other frameworks such as Django, Flask, Spring Boot who want to learn about Node.js server architecture
For those who want to become 'developers who can explain how things work' rather than just 'developers who know how to use them'
A frontend developer who wants to gain a clearer understanding of the flow between server and client while doing web development
Beginners who want to move beyond "development by just memorizing functions" and experience building real backend architecture on their own
Someone who didn't major in Computer Science but wants to challenge themselves with web development while building a solid foundation, hoping to transition into the field
Front-end or full-stack developers who want to utilize JavaScript more deeply in practical work

Need to know before starting?

Basic JavaScript Syntax
Node.js usage experience
Experience with Express.js (optional)
Network and HTTP Concepts (Optional)

Hello
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Reviews

Answers

4.8

Rating

Courses

Hello, welcome to Our Neighborhood Coding Studio!

Our Neighborhood Coding Studio is an educational group co-founded by developers who majored in Computer Science at leading North American universities such as Carnegie Mellon, Washington, Toronto, and Waterloo, and gained practical experience at global IT companies like Google, Microsoft, and Meta.

It originally began as a study group created by computer science majors in the U.S. and Canada to grow and learn together. Although we were at different universities and in different time zones, the time we spent solving problems and learning from one another was truly special, which naturally led us to a certain thought.

“What if we shared the exact same way we studied with others?”

That question was the starting point for Our Neighborhood Coding Studio.

Currently, about 30 professional developers and computer science students are in charge of their respective fields of expertise, directly designing and teaching a curriculum that spans from introductory levels to practical application. Beyond simple knowledge transfer, we provide an environment where you can learn from a real developer's perspective and grow together.

“Real developers must learn from real developers.”

We systematically cover the entire process of web development from start to finish, but we don't stop at theory; we help you build your skills through practice and practical feedback.
Our philosophy is to care about and lead the growth of each and every student.

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From beginners starting development for the first time to job seekers looking to enhance their practical skills and teenagers exploring their career paths,
Neighborhood Coding Studio aims to be everyone's starting point and a reliable companion walking right beside you.

Now, don't struggle alone.
Neighborhood Coding Studio will be with you every step of your growth.

Welcome to Neighborhood Coding Studio!

Neighborhood Coding Studio was founded by a team of developers who studied computer science at top North American universities such as Carnegie Mellon, the University of Washington, the University of Toronto, and the University of Waterloo, and went on to gain hands-on experience at global tech companies like Google, Microsoft, and Meta.

It all began as a study group formed by computer science students across the U.S. and Canada, created to grow together by sharing knowledge, solving problems, and learning from one another.
Though we were attending different schools in different time zones, the experience was so meaningful that it led us to one simple thought:

“What if we shared this way of learning with others?”

That thought became the foundation of Neighborhood Coding Studio.

Today, we are a team of around 30 active developers and computer science students, each taking responsibility for their area of expertise—designing and delivering a curriculum that spans from foundational knowledge to real-world development.
We’re not just here to teach—we’re here to help you see through the lens of real developers and grow together.

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Our courses take you through the entire web development journey—from start to finish—focused on hands-on practice, real-world projects, and practical feedback.
We care deeply about each learner’s growth and are committed to supporting your path every step of the way.

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"True learning comes from doing, and true growth happens together."

Whether you're just getting started, preparing for your first job, or exploring your future in tech,
Neighborhood Coding Studio is here to be your launchpad—and your trusted companion on the journey.

You don’t have to do it alone.
Let Neighborhood Coding Studio walk with you toward your future in development.

Curriculum

All

53 lectures ∙ (5hr 30min)

Course Materials:

Lecture resources

Section 1. 🚧 MyExpress Warming Up for Express.js Clone – Learning Core Concepts by Direct Implementation

13 lectures ∙ (1hr 37min)

1. [MyExpress Project Kick-off] – Our self-built web framework, Getting Started with MyExpress
04:46
2. [Understanding Request/Response Structure] – HTTP's Essence and All We Need to Know About Requests and Responses
08:19
3. [How Routing Works] – HTTP Request Processing and Solving Routing Complexity
05:44
4. [Request Flow Design] – Router Management Improvement and Systematization of Request Processing Flow
06:21
5. [Middleware Architecture Design] – Object-Based Router Management and Middleware Introduction Preparation
07:25
6. [Middleware Chain Implementation] – Middleware Chain Processing Structure Demystified
07:20
7. [req/res Operation Practice] – Manipulating req/res within middleware chain
06:31
8. [Error Handling Mechanism] – Conditional Flow Control and Error Handling Middleware Mastery
06:07
9. [Creating a Static File Server] – Implementing Static File Serving Functionality
08:36
10. [Dynamic Routing Implementation] – Dynamic Routing and Handling URL Parameters
13:23
11. [Implementing a JSON Body Parser] – Processing Request Body Data: Implementing a Body Parser Directly
05:48
12. [Implementing URL-Encoded Body Parser] – Processing Form Data and Implementing URL-Encoded Body Parser
06:54
13. [Router Modularization Strategy] – Structuring Code by Separating Router Objects (Compared to Express.js Approach)
10:43

Section 2. 🧱MyExpress Core Implementation for Express.js Clone – DIY Web Framework: Everything

15 lectures ∙ (2hr 1min)

14. [app object design] – MyExpress's core object, app object design and createApplication
05:14
15. [Server Execution] – Server startup, mastering the app.listen method
09:21
16. [Router Structure] – The Core of Middleware and Routing, A Complete Dissection of createRouter
07:53
17. [Request Processing Flow] – Fully Mastering router.handle, the Core of Request Processing
29:05
18. [Dynamic Routing] – Master Dynamic Routing Completely, Processing URL Parameters with the matchPath Function
07:49
19. [MIME Type] – Mastering Content-Type, Implementing MIME Type and getContentType Function
06:17
20. [Static File Serving] – Full Practical Application, Serving Static Files with Static Middleware
06:55
21. [HTML Rendering] – Complete dynamic HTML rendering, Implement the res.render method
05:53
22. [listen flow analysis] – The final puzzle of the server execution flow, complete mastery of server.listen's operating principles
05:16
23. [JSON Parser] – JSON Body Data Processing, Custom Middleware Implementation
04:55
24. [Form Data Parser] – Master URL-Encoded Form Data, Implement Body Parser Middleware
09:41
25. [Request Logger] – Real-time Request Logging, Complete Implementation of Logger Middleware
06:13
26. [Sub Router] – Mastering Sub Routers, Implementing express.Router()
04:55
27. [Environment Setup] - Create Engine – Implement Environment Variable Loader Middleware
05:09
28. [Real-World Server Initialization] – Completing MyExpress Practical Application, Configuring the Entire Project with index.js
06:57

Section 3. 🧩 Implementing MyExpress Router for Express.js Clone – Practical RESTful API Design & Feature Completion

8 lectures ∙ (35min)

29. [Users Router] – User Router Implementation and Basic RESTful API Structure
05:50
30. [Products Router] – Product Router Implementation and List/Detail Views
06:38
31. [Categories Router] – Implementing Category Router and Hierarchical Classification Processing
04:27
32. [Carts Router] – Cart Router Implementation and User-Specific Management
05:36
33. [Orders Router] – Implementing Order Router and Handling Order Flow
04:09
34. [Payments Router] – Payment Router Implementation and Request Processing Structure
03:39
35. [Reviews Router] – Review router implementation and product review functionality
04:46
36. 📌 Future Course Progression Guide

Section 4. 🛠️MyExpress Security Blueprint for an Express.js Clone – Preventing Vulnerabilities and Upgrading to a Secure Server

5 lectures ∙ (28min)

Section 5. 🧠 MyExpress Design Optimization for an Express.js Clone – Restructuring and Internal Architecture Reorganization for Practical Use

7 lectures ∙ (33min)

Section 6. 🧪 MyExpress Testing Strategy for an Express.js Clone – Building a Stable Server with Automated Validation

4 lectures ∙ (13min)

Section 7. 📚 Per-Lecture Code & Study Materials Guide

1 lectures

Published:

Last updated:

Reviews

All

3 reviews

4.0

3 reviews

jeony05354605
Reviews 2
∙
Average Rating 5.0
5
70% enrolled
While preparing for job hunting, I was struggling to create a differentiated portfolio, and this course became the answer. The experience of cloning the Express engine myself is an excellent topic for demonstrating technical depth even in interviews. It's very practical that the course doesn't just stop at implementing features, but covers security considerations like MIME type detection and path manipulation prevention, synchronous/asynchronous error handling, and even test automation scripts. Particularly in the part about improving architecture using Singleton patterns and IIFE, I was able to deeply consider code quality and maintainability. For those who have taken Part 1, the foundational course, there's a lot of content that will make you slap your knee in realization. I strongly recommend this to aspiring backend developers who want to learn 'properly'.
dbfrontier
Reviews 48
∙
Average Rating 4.6
4
100% enrolled
- nhcodingstudio
  Instructor
  Thank you, Son Jeongman! I sincerely appreciate you leaving such a valuable course review and positive feedback! 🙏 Your encouragement gives me great strength in preparing my lectures. If you've gained a deep understanding of Express.js structure and server engine design principles through this course, I'll continue preparing to bring you more practical topics and expanded content such as backend architecture, databases, and server operations in the future. 🚀 Also, with gratitude and encouragement, please feel free to use the open chat room below whenever you have questions or need help with development. You can communicate with fellow students, and I frequently visit to share concerns and discussions! 📮 Open Chat Room: [https://open.kakao.com/o/gC10Fnoh] I wholeheartedly support your development journey and look forward to seeing you again in the next course! 🌟
gohome
Reviews 19
∙
Average Rating 4.7
3
100% enrolled
- nhcodingstudio
  Instructor
  Hello, GoHome. First of all, I sincerely thank you for taking the 'Building a Node.js Server Engine' course and leaving your honest review. After reviewing the rating and valuable feedback you provided, I feel a heavy sense of responsibility and sincerely apologize that we were unable to provide a sufficiently satisfying course experience that met your expectations. Since the process of learning framework design through cloning Express.js covers such in-depth content, I'm concerned that there may have been parts where the explanations were insufficient or difficult to understand during your learning process. If there were any concepts that were hard to understand or aspects of the course structure that were disappointing, please feel free to share them with me anytime. The specific feedback you provide is the greatest foundation for me to improve the course and create better content. I will diligently update the insufficient parts and do my best to return with better content in the future. Even the smallest questions that arise during your learning are welcome. If you share them through the Q&A board or open chat room, I will answer them sincerely and stay with you until the end to provide practical help for your learning. Once again, thank you for taking your valuable time to share your feedback, and I will show you continued improvement. Thank you.

$18.70

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JavaScript, jQuery

JavaScript+jQuery from Basics to Practice: Intermediate Part.2

usefulit

Real MySQL Season 1 - Part 2

eunbinbaeck0088

You can learn about the core functions of MySQL and how to effectively use them in your work. You can also gain a new understanding of important parts that you have been using for a long time and have overlooked, and gain in-depth database knowledge.

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MySQL, DBMS/RDBMS, backend

Real MySQL Season 1 - Part 2

eunbinbaeck0088

Learning JavaScript Properly: A Complete Guide from Beginner to Professional Part 1 - [Basics]

nhcodingstudio

입문

JavaScript, HTML/CSS, Web Application

Learning JavaScript Properly: A Complete Guide from Beginner to Professional Part 1 - [Basics]

nhcodingstudio

MERN STACK Community: React from Start to Deployment

pandacoding

Build and deploy community applications using the MERN Stack (MongoDB, Express, React, Node + Firebase)

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MongoDB, Express, React

MERN STACK Community: React from Start to Deployment

pandacoding

Learn AWS OpenSearch in One Day

yangdongjun

For those who want to introduce OpenSearch and ElasticSearch to AWS services, we will show you quick results centered on AWS OpenSearch software.

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AWS, amazon-opensearch, amazon-cloudsearch

Learn AWS OpenSearch in One Day

yangdongjun

AWS SAA-C03 Certification Cramming - Pass in 2 weeks with just 163 questions

jscode

I've created a cram course that will help you pass the AWS SAA-C03 (AWS Certified Solutions Architect - Associate) certification in just 2 weeks with only 163 questions!

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AWS, devops, infrastructure

AWS SAA-C03 Certification Cramming - Pass in 2 weeks with just 163 questions

jscode

Learning TypeScript Basics Easily Through Projects

Michael Kwon

TypeScript: Core concepts, from basic to practical, all at once! Practical application through a project.

초급

JavaScript, TypeScript, TailwindCSS

Learning TypeScript Basics Easily Through Projects

Michael Kwon

JavaScript+jQuery from Basics to Practice: Basics Part.2

usefulit

This course will help you learn JavaScript through theory and practice. It explains step by step so that even beginners can easily understand. Part 2 covers JavaScript functions and events, types of functions, and core libraries.

입문

JavaScript, jQuery

JavaScript+jQuery from Basics to Practice: Basics Part.2

usefulit

MySQL for Hundreds of Millions of Platform Data: Insights from a Kakao Interviewer

Hong

This course provides a step-by-step learning path, ranging from the fundamental usage of MySQL to advanced techniques required in real-world production environments. It covers a wide range of topics, including data modeling techniques based on various case studies and practical data, evaluating the effectiveness of Foreign Key designs, analyzing Google Calendar schema DDL, and modern DDL design principles. Through this course, you will gain an in-depth understanding of how to utilize MySQL as a core system component rather than just a simple database.

입문

MySQL, DBMS/RDBMS, Data Engineering

MySQL for Hundreds of Millions of Platform Data: Insights from a Kakao Interviewer

Hong

Equipping Developer Fundamentals - Essential Concepts and Core Theories for Programming Development

codingpe

This course guides you to accurately understand essential programming concepts and theories that are often neglected in the rush of implementation. By learning similar, contrasting, and related concepts together, you will master multiple ideas at once. After completing this course, you will become a developer with a solid conceptual foundation.

입문

Architecture, Computer Architecture, Tech Interview

Equipping Developer Fundamentals - Essential Concepts and Core Theories for Programming Development

codingpe

Asynchronous Programming: Promise, async/await Complete

gymcoding

This lecture clearly explains the concepts and operation principles of Promise and async/await in asynchronous programming in JavaScript, and helps you to skillfully handle asynchronous processing in practice.

초급

promise, async-await, asynchronous-programming

Asynchronous Programming: Promise, async/await Complete

gymcoding

JavaScript & jQuery Core Theory Practical Examples for Web Publishers (Textbook, Completed Version)

codingworks

The JS Core Theory and Practical Example Textbook and Completed Version for Web Publishers is a lecture textbook produced in PDF format. This textbook helps web publishers to fully acquire the basics of JavaScript and jQuery that they must know. A feature of this textbook is that it allows you to strengthen your theory through small missions connected to the theory. In particular, this textbook is also fully prepared with practical examples that utilize all the theories learned. The entire PDF page contains more than 320 pages of pure JavaScript (Vanilla JavaScript) and jQuery, with sufficient explanations added so that Coding Works can be easily understood. In particular, publishers can learn practical examples of jQuery interactions that are essential for creating websites.

초급

JavaScript, jQuery, HTML/CSS

JavaScript & jQuery Core Theory Practical Examples for Web Publishers (Textbook, Completed Version)

codingworks

Cleanup JavaScript: Jump Up!

tonextday

The Ultimate JavaScript Course! It covers execution context structures and mechanisms based on ES2025, the Event Loop, and multi-threading. It also explores the language culture embedded within JavaScript.

초급

JavaScript

Cleanup JavaScript: Jump Up!

tonextday

Learning Express.js Properly: Part2 Engine Internal Working Principles and Clone Project

What you will gain after the course

🚀From "User" to "Implementer" – Core Server Development Principles Learned by Cloning Express.js

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Learning Express.js Properly: Part2 Engine Internal Working Principles and Clone Project

What you will gain after the course

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The characteristics of this course

This course is recommended for

After completing this course

Here's what you'll learn.

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