Tips for troubleshooting event listener in background.js within a Chrome extension

What is the most effective method for testing an event listener code in background.js within a Chrome extension without a user interface?

Imagine you have the following background.js:

chrome.runtime.onMessage.addListener(request => {
    console.log(request);
});

Now, you want to troubleshoot different types of messages (e.g. 

chrome.runtime.sendMessage('someMessage')
) and observe the execution of console.log. Despite attempting to use Chrome's DevTools for the background page and sending a message from the console, the console.log line remains unexecuted.

If anyone can provide assistance, it would be greatly appreciated.

javascriptgoogle-chrome-extension

Answer №1

(my emphasis)

In my attempts to utilize Chrome's DevTools for the background page and send a message using sendMessage, I found that the line with console.log was not being triggered.

When a message is sent from an extension page using chrome.runtime.sendMessage, it does not trigger an event in the same page. This behavior is designed to prevent unnecessary handling of outgoing messages by the sender.

To test this functionality, you will need to create another page and perform the testing there.

This additional page can be as simple as a blank HTML file named "test.html" that you open in a tab using the URL 

chrome-extension://<your-extension-id>/test.html
and utilize the console from there.

Alternatively, you can conduct testing from a content script (where the use of chrome.runtime.sendMessage is allowed), but make sure to pay attention to the context selected at the top of the console (usually displayed as "top" for the page's main frame).

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