Tutorials MERN Stack Tutorial

Create the Monorepo Folders

Create the Monorepo Folders: free step-by-step lesson with examples, common mistakes, and interview tips — part of MERN Stack Tutorial on Toolliyo Academy.

8 min read Updated 7/21/2026

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MERN Stack Tutorial · Lesson 4 of 100

Create the Monorepo Folders

Setup & React → API Mongo Auth → Wire & Harden → Ship & Projects

Setup & React · 1 — UI · ~6 min · Setup and Architecture

What is this?

A simple layout: /server for Express and /client for Vite React keeps concerns clear while you learn.

Why should you care?

Mixed folders become hard to deploy and easy to leak server secrets into the frontend bundle.

See it live — copy this example

Run examples in your MernVerse client/ (Vite React) or server/ (Express) folders. Keep secrets in .env.

mernverse/
  client/          # Vite + React
  server/          # Express + Mongoose
  package.json     # optional workspace root
  .gitignore       # node_modules, .env

Run Example »

Edit the code below and click Run to see the result in Toolliyo’s live editor.

Code

Result

What happened?

Each side has its own package.json.
Root scripts can run both with concurrently later.

Practice next

Create client and server folders.
Add .gitignore for node_modules and .env.
Init npm in each folder.
Add a root script "dev" later.
Decide ports: 5173 client, 5000 API.

Remember

client ≠ server. Separate package.json files. Never commit secrets.

Repo shape

Two developers join MernVerse.

Outcome: They know where API vs UI lives.

Interview prep for this lesson

Practice these questions aloud after reading—each links to a full structured answer.

Junior Detailed

Explain JavaScript in the context of MERN Stack.

Short answer: JavaScript runs single-threaded with an event loop. Closures capture lexical scope; promises/async handle I/O without blocking the UI thread. How to structure your answer (60–90 seconds) Define JavaScript i…

What are common mistakes teams make with Components when using MERN Stack?

Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. How to structure your answer (60–90 seconds) Define Components in plain language…

Senior Detailed

How would you debug a production issue related to State in a MERN Stack application?

Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. How to structure your answer (60–90 seconds) Define State in plain language for…

Compare two approaches to API integration—when would you choose each?

Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. How to structure your answer (60–90 seconds) Define API integration in plain lan…

Junior Detailed

Describe a real-world scenario where Performance mattered in a MERN Stack project.

Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. How to structure your answer (60–90 seconds) Define Performance in plain languag…

All course Q&A Practice exams

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