Under the hood ReactJS
Entire React code base explanation by visual block schemes (Stack version)
Under the hood ReactJS launched on July 3, 2017 with 266 votes, #75 of 2,972 launches that month and more than 99% of that year's launches. The site was still online in September 2026, 9 years on.
In plain words
Under the Hood ReactJS is a developer resource that provides visual block diagrams explaining how React's internal code works. It breaks down React's architecture and logic through clickable flowcharts that users can zoom and examine in detail. The project currently covers React's Stack version with work underway on the Fiber version. It's designed for developers who want to understand React's inner workings by studying the codebase structure and concepts through visual representations rather than text alone.
written from the facts on this page · September 2026
From the sources
This repository contains an explanation of inner work of React. In fact, I was debugging through the entire code base and put all the logic on visual block-schemes, analyzed them, summarized and explained main concepts and approaches. I’ve already finished with Stack version and now I work with the next, Fiber version. Each scheme is clickable and can be opened in a new tab, use that to zoom it and be able to read from it. Keep the article and a scheme you are reading about at that moment in separate windows (tabs), that will help to match text and code flow easier. We are gonna talk here about both React versions, current one with Stack reconciler and the next one with Fiber (as you…from bogdan-lyashenko.github.io
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