How To Debug Javascript In Visual Studio Code

How To Debug Javascript In Visual Studio Code


How To Debug Javascript In Visual Studio Code : Debugging is a critical aspect of JavaScript development, allowing programmers to identify and resolve errors in their code effectively. Visual Studio Code (VS Code) provides a robust and feature-rich environment for debugging JavaScript applications, making the process seamless and efficient.

In this guide, we will explore the process of debugging JavaScript code in Visual Studio Code, highlighting the key steps and tools that enhance the debugging experience. Whether you are a beginner or an experienced JavaScript developer, understanding how to leverage the debugging capabilities of VS Code can significantly improve your development workflow.

Visual Studio Code offers a range of debugging features for JavaScript, including breakpoints, stepping through code, inspecting variables, and evaluating expressions. These tools enable developers to track the execution flow of their JavaScript code, analyze variable values at specific points, and diagnose the root causes of bugs more effectively.

Furthermore, VS Code provides extensions specifically designed for JavaScript development, offering additional functionalities and insights. These extensions enhance the debugging experience by providing syntax highlighting, code suggestions, and integrated linting to help catch errors early on.

In the following sections, we will delve into the various techniques and configurations available in Visual Studio Code to debug JavaScript code effectively. By mastering the art of debugging in VS Code, developers can streamline their JavaScript development process, increase productivity, and deliver high-quality applications.

How To Debug Javascript In Visual Studio Code

How to Debug JavaScript with VS Code?

To bring up the Run and Debug view, select the Run and Debug icon in the Activity Bar on the side of VS Code. You can also use the keyboard shortcut Ctrl+Shift+D. The Run and Debug view displays all information related to running and debugging and has a top bar with debugging commands and configuration settings.

To debug line by line in Visual Studio Code, you can follow these steps:

1. Set Breakpoints: Open the file you want to debug in Visual Studio Code and set breakpoints by clicking on the left gutter of the code editor at the desired lines. Breakpoints are indicated by red circles.

2. Start Debugging: From the Debug view (accessible from the sidebar or by pressing `Ctrl+Shift+D`), select the desired debug configuration you want to use. Press the “Start Debugging” button (green play icon) or press `F5` to start the debugging session. Visual Studio Code will use the configured launch settings and launch your application in debug mode.

3. Debugging Controls: Once the debugger is active, you can use the debugging controls provided in the top toolbar or use the associated keyboard shortcuts. The key controls for line-by-line debugging are:

   – Step Over (`F10` or `Shift+F11`): Executes the current line and moves to the next line. If the current

How do I run JavaScript code in Visual code Studio?

Open JavaScript Code in VSCode after installing the code runner extension. To run the code, use the CTRL+ALT+N shortcut or hit F1 and enter Run Code. You will then see the output in the “OUTPUT” tab.

To run JavaScript code in Visual Studio Code, you can follow these steps:

1. Install Node.js: JavaScript code can be executed outside the browser using Node.js. Make sure you have Node.js installed on your computer. You can download it from the official Node.js website ( and follow the installation instructions for your operating system.

2. Open Visual Studio Code: Launch Visual Studio Code on your computer.

3. Create a new JavaScript file: In Visual Studio Code, create a new file with a `.js` extension. You can do this by clicking on “File” in the menu bar, selecting “New File,” and then saving the file with a `.js` extension (e.g., `script.js`).

4. Write your JavaScript code: Open the newly created JavaScript file and write your JavaScript code in it.

5. Open the Integrated Terminal: In Visual Studio Code, go to the menu bar and click on “View,” then select “Terminal” from the drop-down menu. This will open the Integrated Terminal at the bottom of the editor.

How to enable Debug in JavaScript?

Normally, you activate debugging in your browser with F12, and select “Console” in the debugger menu.

To enable debugging in JavaScript, you can use the built-in debugging capabilities of modern web browsers or use a dedicated tool like Visual Studio Code. Here’s how you can enable debugging in JavaScript using both approaches:

1. Debugging in Web Browsers:

   – Open your JavaScript code in a web browser (e.g., Google Chrome, Mozilla Firefox).

   – Right-click on the webpage and select “Inspect” or “Inspect Element” from the context menu. This will open the browser’s developer tools.

   – In the developer tools, navigate to the “Sources” or “Debugger” tab.

   – Locate your JavaScript file in the list of sources or scripts.

   – Set breakpoints in your code by clicking on the line numbers or using the shortcut key (usually F9 or clicking on the left gutter of the code).

   – Trigger the execution of your JavaScript code (e.g., by interacting with the webpage).

   – When the code reaches a breakpoint, the browser will pause execution, and you can inspect variables, step through the code line by line, and analyze the program’s behavior.

2. Debugging in Visual Studio Code:

   – Install the “Debugger for Chrome” extension (if debugging with Chrome) or the “Debugger for Firefox” extension (if debugging with Firefox) in Visual Studio Code.

   – Open your JavaScript file in Visual Studio Code.

   – Set breakpoints in your code by clicking on the left gutter of the code or using the shortcut key (F9 by default).

   – Click on the “Run and Debug” icon in the sidebar (or press `Ctrl+Shift+D`).

   – Click on the “Create a launch.json file” link and select the appropriate environment (e.g., Chrome or Firefox).

How To Debug Javascript In Visual Studio Code

What is JavaScript Debug terminal in VS Code?

It’s a terminal that loads your regular shell, but if you run anything that is Node. js, it will allow you to debug it. This is super powerful and convenient. You can start an npm script, a node process, anything that starts Node. js and you’re able to add breakpoints in VS Code and debug right away.

Apologies for the confusion, but there is no specific “JavaScript Debug Terminal” in Visual Studio Code. However, Visual Studio Code does provide a built-in terminal where you can run JavaScript code and perform debugging tasks.

The integrated terminal in Visual Studio Code allows you to execute commands, run scripts, and interact with your project’s environment directly within the editor. You can use the terminal for debugging purposes by executing debugging-related commands or running your JavaScript code in a debugging environment.

When you run a debugging session in Visual Studio Code using a debugger extension like “Debugger for Chrome” or “Debugger for Node.js,” the debugging output, including console logs and error messages, is typically displayed in the Debug Console. The Debug Console is a panel within Visual Studio Code where you can view and interact with the debugging output.

To open the integrated terminal in Visual Studio Code, you can go to the menu bar and select “View” > “Terminal” or use the shortcut key `Ctrl+` `backtick` (grave accent).

In summary, while there is no specific “JavaScript Debug Terminal” in Visual Studio Code, you can use the integrated terminal for running JavaScript code, executing debugging-related commands, and viewing the debugging output in the Debug Console.

How to do debugging in Visual Studio?

Navigate code in the debugger using step commands

To start your app with the debugger attached, press F11 (Debug > Step Into). F11 is the Step Into command and advances the app execution one statement at a time.

To perform debugging in Visual Studio, you can follow these steps:

1. Set breakpoints: Open your JavaScript code file in Visual Studio. Set breakpoints by clicking on the left gutter of the code, where line numbers are displayed. This will mark the lines where you want the debugger to pause execution for inspection.

2. Select the debugging environment: In the toolbar, you’ll find a dropdown menu next to the “Start Debugging” button. Click on it and select the desired debugging environment, such as “Script” for JavaScript debugging.

3. Configure the debugging environment: Once you’ve selected the debugging environment, you may need to configure it. You can modify the configuration by clicking on the gear icon next to the dropdown menu or selecting “Debug” > “Options and Settings” > “Debugging” > “General” from the menu bar. Here, you can specify the browser or other runtime you want to use for debugging, along with additional

Is JavaScript difficult to Debug?

Debugging front-end JavaScript code brings with it some unique challenges; primarily the difficulty in identifying errors, reproducing errors, and validating that a fix actually took. Exposing errors: The first step in debugging JavaScript is to proactively attempt to expose issues to the browser.

Debugging JavaScript can sometimes be challenging, especially for complex applications or when dealing with subtle issues. Here are a few reasons why JavaScript debugging can be perceived as difficult:

1. Dynamic and loosely typed nature: JavaScript is a dynamically typed language, meaning that variables can hold values of any type. This flexibility can make it challenging to spot type-related errors or unexpected behavior during debugging.

2. Asynchronous code: JavaScript commonly utilizes asynchronous operations, such as callbacks, promises, and async/await. Debugging asynchronous code can be tricky because the execution order may not follow a straightforward linear path, making it harder to trace the flow of control.

3. Browser compatibility: JavaScript is often executed within web browsers, and different browsers may have variations in their JavaScript engines or implementation details. Debugging can become more complex when trying to address issues specific to a particular browser.

Despite these challenges, there are several tools and techniques available that can greatly assist with JavaScript debugging:

– Integrated Development Environments (IDEs) like Visual Studio Code offer powerful debugging features, including breakpoints, variable inspection, and step-by-step execution.

– Browser developer tools (e.g., Chrome DevTools, Firefox Developer Tools) provide robust debugging capabilities specifically for web-based JavaScript. They offer features such as breakpoints, call stack visualization, network monioring, and performance profiling.

– Logging and console output: Strategically placed console.log statements can help trace the execution flow and inspect variable values at various points during program execution.

– Automated testing frameworks: Writing unit tests or integration tests for your JavaScript code can help identify issues and verify expected behavior. Test frameworks often provide tools for debugging and diagnosing failures.

With the right tools, techniques, and experience, debugging JavaScript becomes more manageable, and you can effectively identify and resolve issues in your code.

How to Debug a script in Visual Basic?

  • Debugging VBS Scripts in Visual Studio
  • Switch to DIAdem SCRIPT.
  • Open or create a VBS file.
  • Click Use External Debugger on the toolbar.
  • Select a line and click Insert Breakpoint F9 on the command bar.
  • Click Run Script + F5 on the toolbar.

To debug a script written in Visual Basic (VB) using Visual Studio, you can follow these steps:

1. Set breakpoints: Open your Visual Basic script file (.vb) in Visual Studio. Set breakpoints by clicking on the left gutter of the code, where line numbers are displayed. This will mark the lines where you want the debugger to pause execution for inspection.

2. Start debugging: Click on the “Start Debugging” button in the toolbar or press the F5 key. This will launch the script in debug mode.

3. Execute the script: The script will start executing, and when it encounters a breakpoint, it will pause execution at that line. You can now analyze the state of variables and step through the code.

4. Inspect variables and control flow: While the script is paused at a breakpoint, you can inspect the current values of variables by hovering over them or viewing them in the “Locals” or “Watch” window. You can also step through the code line by line using the “Step Over” (F10), “Step Into” (F11), or “Step Out” (Shift+F11) buttons in the toolbar.

5. Modify variable values: During debugging, you can change the values of variables to test different scenarios or correct unexpected behavior. You can modify variables directly in the “Locals” or “Watch” window or use the “Immediate” window to execute expressions and modify values on the fly.

How To Debug Javascript In Visual Studio Code


Debugging JavaScript code in Visual Studio Code empowers developers to efficiently identify and resolve errors, leading to improved code quality and a smoother development process. Throughout this guide, we have explored the key steps and tools available in VS Code that make the debugging experience seamless and productive.

By leveraging the debugging features of Visual Studio Code, such as breakpoints, code stepping, variable inspection, and expression evaluation, developers gain valuable insights into their JavaScript code’s execution flow and behavior. These tools enable them to pinpoint the root causes of bugs, track variable values, and make informed decisions on how to fix issues effectively.

Additionally, the availability of JavaScript-specific extensions in Visual Studio Code enhances the debugging experience further. These extensions provide useful features like syntax highlighting, code suggestions, and integrated linting, helping developers catch errors and maintain code quality throughout the development process.

Mastering the art of debugging in Visual Studio Code allows JavaScript developers to streamline their workflow, increase productivity, and deliver robust applications. By effectively debugging JavaScript code, developers can save time and effort, ensuring that their applications run smoothly and efficiently.