How to debug code in Debian JS
May 16, 2025 pm 09:18 PMYou can use a variety of tools and strategies for JavaScript code debugging on Debian systems. Here are some common debugging tips and tools:
Take advantage of Node.js built-in debugger
-
Start the debugger : Insert the debugger; statement in your JavaScript file. This will trigger the debugger when it is executed to that line.
<code> node inspect your_script.js</code>
This will start the debugger and pause at the debugger; statement.
-
Debug command : At the debug prompt, you can use the following command to control code execution:
- cont: Continue running the code until the next breakpoint or program ends.
- next: Execute the next line of code without entering the function.
- step: Enter the function called in the current line.
- out: Exit the current function.
- setBreakpoint(line): Set breakpoint on the specified line.
- clearBreakpoint(line): Clears the breakpoint of the specified line.
- list: List the context code of the current line.
- watch(expr): monitors the value of the expression.
Utilize browser developer tools
-
Start debugging : Add the --inspect option when starting the Node.js application, and then use the developer tools of Chrome or Edge browser to debug.
<code> node --inspect app.js</code>
Visit chrome://inspect in Chrome and click the "inspect" button to start the developer tool.
Debug operations : In DevTools, you can set breakpoints, view variables, execute code step by step, etc.
Debugging with Visual Studio Code
Configure debugging : Open your Node.js project in VS Code, press F5 or click the green arrow in the debug toolbar to start debugging. Set breakpoints in the code, and then step through the code, observing the variables and executing the process.
-
Create launch.json file : Create .vscode/launch.json file in the project root directory and configure debugging tasks:
<code> { "version": "0.2.0", "configurations": [ { "type": "node", "request": "launch", "name": "Debug Node.js", "program": "{workspaceFolder}/server.js" } ] }</code>
Replace server.js with your entry file name.
Use another IDE or debugging tool
- IDEs such as WebStorm , IntelliJ IDEA, etc. also support debugging of Node.js applications, usually with similar configuration processes.
Use logs and console.log()
- Adding console.log() statement to the code is a simple but effective debugging method. You can output variable values, function call results and other information to help understand the execution process of the code.
Through these methods, you can efficiently debug JavaScript code on Debian and select tools and methods that suit your workflow for debugging.
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