Nodemon for development reloading in Express - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What happens when you run nodemon on an Express app?

You start your Express app using nodemon app.js. What is the main behavior you observe compared to running node app.js?

A Nodemon automatically restarts the server when you change any source file.

B Nodemon compiles the Express app into a binary before running it.

C Nodemon runs the app only once and then exits immediately.

D Nodemon disables all console logs to speed up the app.

💡 Hint

Think about what helps developers see changes without manually restarting.

Nodemon watches your files and restarts the server automatically when it detects changes. This saves time during development.

📝 Syntax

intermediate

Which command correctly installs nodemon as a development dependency?

You want to add nodemon to your Express project only for development. Which command is correct?

A npm install nodemon --save-dev

B npm install nodemon --global

C npm install nodemon --save

D npm install nodemon --production

💡 Hint

Development dependencies are installed with a special flag.

The --save-dev flag installs nodemon only for development, not for production use.

🔧 Debug

advanced

Why does nodemon not restart after file changes?

You run nodemon app.js but after editing your source files, the server does not restart. What is a likely cause?

A Nodemon only works with TypeScript files, not JavaScript.

B Nodemon only restarts on changes to <code>package.json</code> by default.

C Nodemon requires a manual restart command after every change.

D The files edited are outside the watched directory or ignored by nodemon.

💡 Hint

Check which files nodemon watches and ignores.

Nodemon watches files in the current directory by default. If you edit files outside or listed in .nodemonignore, it won't restart.

❓ state_output

advanced

What is the output when nodemon restarts the server?

You run nodemon app.js and then save changes to app.js. What output do you expect in the terminal?

A No output; nodemon restarts silently without messages.

B An error message saying nodemon cannot restart the server.

C A message showing the server stopped and then restarted automatically.

D The server crashes and nodemon exits immediately.

💡 Hint

Think about what nodemon shows to inform you about restarts.

Nodemon prints messages like 'app crashed - waiting for file changes...' or 'restarting due to changes...' to keep you informed.

🧠 Conceptual

expert

Why is nodemon preferred during Express app development?

Choose the best explanation for why developers use nodemon instead of running node app.js directly during development.

A Nodemon disables all logging to reduce console clutter during development.

B Nodemon saves time by automatically restarting the server on code changes, improving developer productivity.

C Nodemon runs the app in a sandboxed environment to prevent security issues.

D Nodemon compiles Express apps into faster machine code for production use.

💡 Hint

Focus on how nodemon helps with the development workflow.

Nodemon watches your files and restarts the server automatically when you save changes. This avoids manual restarts and speeds up testing.