- Right-click on the page and select “Inspect” or press Ctrl+Shift+I (Windows) or Command+Option+I (Mac);
- In the Developer Tools panel, click on the “Console” tab;
- Look for error messages highlighted in red. These messages provide valuable information about the nature of the error.
- Review the code and check for any missing or misplaced characters;
- Use a code editor with syntax highlighting to help identify errors;
- Verify variable declarations and ensure they follow the correct syntax.
Undefined variables occur when a variable is referenced but not defined. To resolve this issue:
- Check for typos in variable names and ensure they match the ones used in the code;
- Make sure variables are declared before they are used;
- Verify that variables are defined within the correct scope.
Unhandled Promises or Callbacks
- Wrap asynchronous code within a try-catch block to catch any exceptions;
- Implement error handling functions for promises using .catch() or .finally().
Clearing Cache and Cookies
- Click on the three-dot menu icon in the top-right corner of the browser window;
- Go to “Settings” and scroll down to click on “Advanced”;
- Under the “Privacy and security” section, click on “Clear browsing data”;
- Select “Cookies and other site data” and “Cached images and files”;
- Click on “Clear data” to remove the selected items.
Updating Google Chrome
- Click on the three-dot menu icon and go to “Settings”;
- Scroll down and click on “About Chrome”;
- Chrome will automatically check for updates and install them if available.
Disabling Browser Extensions
- Click on the three-dot menu icon and go to “More tools” and select “Extensions”;
Checking for Network Issues
- Verify that your internet connection is active and stable;
- Disable any VPN or proxy services temporarily to check if they are causing the issue;
- Use the console.log() function to print variable values and debug information to the browser console;
- Set breakpoints in the code using the Sources panel of the Developer Tools and step through the code execution to identify the point of failure;