The 512,000-byte README is the main product
The 512,000-byte README opens with a numbered table and carries the main sequence through question 356. Answers sit below the table with code snippets and links back to the top. Coverage includes core React, Router, internationalization, testing, Redux, React Native, related libraries, and miscellaneous browser work. It is an interview crib sheet, not a prose tutorial, so readers can jump straight to a hook, lifecycle method, or routing question without following a chapter order.
Our measured checkout had 383 files, about 4,367 lines of source, and used 7.2 MB before installation. Much of the repository is learning material: the large README, images, small exercise apps, and individual coding projects. That shape makes sense for study. It also means repository size says little about the accuracy of an answer. The useful review task is checking scope, dates, examples, and whether older advice is clearly separated from current practice.
Questions 321 through 323 cover React 19
Questions 321 through 323 introduce React 19 features, the use() API, and Server Actions. Later additions take the current sequence through modern Redux and React Router topics, ending at question 356 with query parameters. That recent material is useful for candidates who have already read the basics and want prompts about actions, optimistic state, server components, Redux Toolkit, route loaders, and data APIs. Answers usually include enough code to start a verbal explanation.
A separate Old Q&A section still contains React 16-era lifecycle material, class-component examples, Create React App references, and legacy concurrent rendering text. Open issue 359 about class examples asks whether one answer should move to function components. Open issue 313 about React Router asks for questions 81 through 86 to move from Router v4 to v6. The repository now has newer Router v6 answers too, so readers must notice which section they reached.
What happened when we ran it
Our sandbox installed commit 55b7d49 in 15 seconds on 3 CPUs with 8 GB of RAM. Npm added 22 packages, occupied 37 MB, and reported 0 known vulnerabilities across all severity levels. That is a light root dependency footprint. It does not measure how long the README takes to study, whether its React claims are correct, or whether any nested exercise app works on the same machine.
The root had no build script or target, so our build step was skipped. It also had no test script or target, so our test step was skipped. The scan found 0 CI workflow files, no Dockerfile, and no tests directory. These results are less alarming for a document collection than for a shipped library, but they leave no automated evidence that links resolve, examples compile, or answers stay consistent as React changes.
The 7.2 MB checkout contains separately run exercise apps
The 7.2 MB repository is more than one README. Its tree contains a coding-exercise app, a Vite-based hooks area, and 13 folders under coding-projects, including a carousel, data table, modal, shopping cart, star rating, and todo app. The exercise guide supplies problems and solutions, while the project folders carry their own package manifests. These additions can turn passive review into code reading, though they are not exposed as one root application.
Our root install pulled 22 packages but had no command that built or tested the nested projects. The coding exercise guide tells users to work inside that app, and each newer project is another small environment. Budget setup per chosen folder. If browser-based drills are the priority, the README also promotes an external GreatFrontEnd question service before its own table, which is a different product with separate terms.
An August 31 push matters more than the missing release tag
GitHub recorded 44,771 stars, 9 combined open issues and pull requests, and a last push on August 31, 2026. Recent commits added Redux questions and several coding projects. Six of the 9 open items were pull requests when fetched, including dependency maintenance and new Fiber material. The latest-release endpoint returned no release, but that absence is not evidence of neglect when source changes landed four days before this review and discussion remains open.
The front page is less disciplined than the update record. Three promotional blocks appear before the table of contents: GreatFrontEnd, Zero To Mastery, and Resume Loom. The repository itself uses the MIT license, but linked commercial services have their own offers. Readers who arrive for a quick answer have to pass that material first. This does not spoil the question bank, though it makes the page feel closer to a maintained personal study hub than neutral reference documentation.
Use all 356 current questions as prompts, not an answer key
The 356-question current sequence is best used to generate follow-ups. Read an answer, explain it without looking, then compare the API against the version used by the target team. For an interviewer, choose a small subset and ask for tradeoffs or code changes instead of rewarding memorized wording. The modern React 19, Redux, and Router additions give that conversation useful breadth, while the Old Q&A label tells you where extra caution is due.
The repository earns a bookmark because 44,771 stars and an August 31 push accompany unusually wide React coverage. Its limits are equally plain: 0 root tests ran, there is no tagged release, and version transitions are handled inside one very long page. Use the list to find what you cannot yet explain. For decisions about production APIs, verify the answer against current library documentation and the versions in the codebase you are interviewing for.