7-Day MERN Stack Interview Preparation Plan
Your saved questions plus a day-by-day plan. Add questions with Save to → 7-Day Job Prep on any question page.
Day-by-day plan
Day 1JavaScript fundamentals
- Revise scope, hoisting, closures and this
- Solve five event loop output questions
- Write debounce and Promise.all from memory
- Review array methods map, filter and reduce
Day 2Node.js core
- Revise event loop phases and the thread pool
- Practise streams with a file compression script
- Review error handling and graceful shutdown
- Explain cluster versus worker threads aloud
Day 3Express and REST APIs
- Build a CRUD router with validation middleware
- Write a central error handler with a custom error class
- Revise status codes, CORS and pagination
- Design an API for a sample orders module
Day 4MongoDB and Mongoose
- Practise ten queries and three aggregation pipelines
- Revise embedding versus referencing with examples
- Create compound indexes and read explain output
- Write a Mongoose schema with validation and hooks
Day 5React fundamentals and hooks
- Live code a todo list and a controlled form in 20 minutes
- Revise useEffect, useMemo, useCallback and useRef
- Build a useFetch and useDebounce hook
- Review keys, stale closures and race conditions
Day 6Auth, security and deployment
- Implement JWT login with an httpOnly refresh cookie
- Revise XSS, CSRF and NoSQL injection defences
- Write a Dockerfile and docker compose file
- Review CI/CD steps and the React 404 refresh fix
Day 7Projects and mock interview
- Prepare a five-minute walkthrough of your best MERN project
- Practise three HR answers using the STAR method
- Take a timed mock interview with a friend
- Revise the 30 quick revision points
Frequently asked questions
Can I prepare for a MERN Stack interview in 7 days?
Seven days is enough to revise and sharpen, not to learn from zero. Use the plan to cover each core topic once, practise questions daily and finish with a mock interview.
How do I add questions to the plan?
On any question page choose Save to → 7-Day Job Prep. Saved questions show up at the top of this page.
How many hours a day should I study?
Two to four focused hours a day works for most people: one hour of revision, one to two hours of questions, and the rest on projects or mock answers.
Questions to practise each day
Company-wise MERN Stack questionsExperience-wise MERN Stack questionsRole-wise MERN Stack questionsCity-wise MERN Stack questionsMost asked MERN Stack questionsScenario-based questionsPractical / hands-on questionsHR & behavioural questionsMERN Stack mock interviewOnline assessment questionsTechnical round questionsManagerial round questionsMERN Stack topic sheets