How to capture error messages in browser console using Puppeteer

To capture error messages from the browser's console in Puppeteer, you can modify the event listener to filter and handle messages based on their type. Here’s how you can do it:

1. Modify Console Event Listener:

   • Use the page.on('console', ...) method to register an event listener for console events.
   • Inside the listener callback, check the type of each message (message.type()) and handle only error messages ('error' type).

2. Example Code:

   const puppeteer = require('puppeteer');
   
   (async () => {
     const browser = await puppeteer.launch();
     const page = await browser.newPage();
   
     // Enable console error interception
     page.on('console', message => {
       if (message.type() === 'error') {
         console.error(`Console Error: ${message.text()}`);
       }
     });
   
     // Navigate to a web page
     await page.goto('https://example.com');
   
     // Perform actions that trigger console messages
     await page.evaluate(() => {
       console.log('Hello from the browser console!');
       console.warn('Warning: This is a test warning.');
       console.error('Error: This is a test error.');
     });
   
     // Close the browser
     await browser.close();
   })();
   

3. Explanation:

   • page.on('console', ...): Registers a listener for console events on the Page instance.
   • message.type(): Retrieves the type of the console message ('log', 'warning', 'error', etc.).
   • Filtering Messages: Inside the event listener, check if message.type() is 'error' to capture only error messages.
   • Handling Error Messages: Use console.error() (or any appropriate handling mechanism) to process and log error messages to your console or log files.

4. Additional Considerations:

   • Custom Logging: Adjust the logging mechanism (console.error(), file logging, etc.) based on your project’s logging requirements.
   • Error Handling: Ensure that your Puppeteer script effectively captures and handles all relevant error messages from the browser's console.

By implementing this approach, you can focus on capturing and managing error messages specifically, which is useful for debugging and monitoring purposes in Puppeteer automation scripts. Adjust the logic further as needed to fit your specific use case and logging requirements.