How do I debug JavaScript code

Debugging JavaScript code is essential for ensuring that your applications run smoothly and efficiently. Here are several methods you can use to debug JavaScript:

  • Using Console.log: The simplest way to check variable values or see if a piece of code has executed.
  • Browser Developer Tools: Modern browsers come with built-in developer tools that allow you to inspect elements, view console output, and step through JavaScript code.
  • Breakpoints: Set breakpoints in your code to pause execution and inspect the current values of variables and the call stack.
  • Debugging Libraries: Use libraries like Debug.js or log.js to help manage and format logging in your application.
  • Unit Testing: Write tests for your code to catch errors before they become bigger issues.

Here’s a simple example of using console.log to debug:

function addNumbers(a, b) { console.log('Adding', a, 'and', b); return a + b; } console.log('Result:', addNumbers(5, 10));

JavaScript Debugging Console.log Browser Developer Tools Breakpoints Unit Testing

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