Node.js Debugger

Node.js Debugger is an advanced tool that enables developers to debug their Node.js applications with ease. It allows developers to inspect the state of their application during runtime, set breakpoints, step through code, and even modify variables and function calls on the fly.

How to Use Node.js Debugger

Using Node.js Debugger is easy and straightforward. Here are the steps to get started:

1. First, start your Node.js application with the --inspect flag:

node --inspect app.js

2. In your Chrome browser, navigate to chrome://inspect.

3. Click on "Open Dedicated DevTools for Node".

4. You should now see the "Node.js Debugger" DevTools window.

Node.js Debugger Features

Breakpoints

Setting breakpoints in Node.js Debugger is easy. Simply click on the line number in the source code where you want to set a breakpoint. When the application hits that line, it will pause execution and allow you to inspect the state of the application at that point.

Stepping Through Code

Node.js Debugger allows you to step through your code one line at a time. You can step into functions, step over functions, and step out of functions.

Watch Variables

With Node.js Debugger, you can watch variables and their values as your code is executing. You can add variables to the watch list by clicking on them in the source code, or by manually adding them in the "Watch" panel.

Modify Variables on the Fly

Node.js Debugger allows you to modify variables and function calls on the fly. You can change the values of variables, and even call functions with different arguments, all while your application is running.

Memory Profiling

Node.js Debugger includes a memory profiler that allows you to inspect the memory usage of your application over time. This can be useful for identifying memory leaks and optimizing performance.

Conclusion

Node.js Debugger is an invaluable tool for developers who need to debug their Node.js applications. With its powerful features and easy-to-use interface, developers can quickly identify and fix bugs, optimize performance, and improve the overall quality of their code.