About ReactGrind

Most "practice" platforms for frontend interviews either ask trivia-style questions or check your answer against a single hardcoded output. Neither actually tells you whether your component works. ReactGrind was built to fix that: every challenge is graded by a hidden test suite that mounts your component and interacts with it — clicking, typing, re-rendering — the same way a real reviewer or interviewer would.

The goal isn't just to help you pass an interview. It's to make you a genuinely sharper React engineer — someone who understands re-renders, state, and component design, not just someone who memorized answers.

ReactGrind is built and maintained by Kumar Astik, a MERN developer who spends most of his time writing React code and thinking about how to teach it better. Every problem, test suite, and editorial on this platform is hand-written — nothing here is auto-generated filler.

ReactGrind started as a personal collection of practice problems and grew into a full platform once it became clear other engineers wanted the same kind of test-graded, no-nonsense practice.

• A growing library of React coding challenges, organized by topic, difficulty, and company
• An in-browser editor and live preview — no local setup required
• Written editorials and community discussions for every problem
• Focused practice tracks like React Hooks Practice and Interview Prep
• A free React online compiler for quick experiments
• A blog covering React internals, patterns, and interview-relevant concepts

No static answer keys. No multiple-choice trivia. Every challenge on ReactGrind is checked by a real test suite, and every problem is written by hand — the same philosophy that shows up across the challenges, the editorials, and the blog.

Have feedback, found a bug, or want to suggest a problem topic? Reach out through the Contact page — every message goes straight to the person building ReactGrind, not a support queue.