Node.js built-in debugger in Node.js - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the Node.js built-in debugger?

The Node.js built-in debugger helps you find and fix errors in your code by letting you pause execution, inspect variables, and step through your program line by line.

beginner

How do you start the Node.js built-in debugger from the command line?

You start it by running your script with the command node inspect your_script.js. This launches the debugger interface in the terminal.

intermediate

What command do you use in the Node.js debugger to continue execution until the next breakpoint?

Use the cont or c command to continue running until the next breakpoint or pause point.

intermediate

Explain the use of the repl command in the Node.js debugger.

The repl command opens a Read-Eval-Print Loop where you can type JavaScript expressions to inspect or change variables while paused.

beginner

How can you set a breakpoint in your Node.js code to use with the built-in debugger?

Insert the statement debugger; in your code where you want to pause. When running with the debugger, execution will stop at that line.

Which command starts the Node.js built-in debugger?

A node inspect script.js

B node debug script.js

C node run script.js

D node start script.js

The correct command is node inspect script.js to start the built-in debugger.

What does the cont command do in the Node.js debugger?

A Restarts the program

B Stops the debugger

C Prints all variables

D Continues execution until the next breakpoint

The cont command resumes running the program until it hits the next breakpoint or finishes.

How do you pause execution at a specific line in your code when debugging?

A Add <code>pause;</code> in code

B Add <code>debugger;</code> in code

C Add <code>stop;</code> in code

D Add <code>break;</code> in code

The debugger; statement pauses execution when the debugger is running.

What is the purpose of the repl command in the Node.js debugger?

A Runs the program

B Exits the debugger

C Allows interactive JavaScript evaluation

D Sets a breakpoint

The repl command opens an interactive prompt to evaluate JavaScript expressions while paused.

Which of these is NOT a feature of the Node.js built-in debugger?

A Automatically fix bugs

B Inspect variable values

C Step through code line by line

D Set breakpoints

The debugger helps find bugs but does not automatically fix them.

Describe how to use the Node.js built-in debugger to find a bug in your code.

Think about starting, pausing, stepping, and checking values.

Explain the role of the debugger; statement in Node.js debugging.

It's a special line you add to pause your program.