Regarding issue in chrome extension development

[Abhishek Sinha]

Hello, I am trying to develop a extension to redirects the page to google.com if a 404 status code is reached without using netRequest API or webBlockingAPI

Here is my manifest file

{

  "name": "404 Redirect",

  "version": "1.0",

  "description": "Redirects to google.com if a 404 status code is reached",

  "manifest_version": 3,

  "permissions": ["activeTab"],

  "background": {

    "service_worker": "background.js"

  }

}

and here is my background.js file

chrome.webNavigation.onCompleted.addListener(function (details) {

  if (details.statusCode === 404) {

    chrome.tabs.update({ url: "https://www.google.com" });

  }

});

 I am getting the following errors:

Service worker registration failed. Status code: 15

Uncaught TypeError: Cannot read properties of undefined (reading 'onCompleted')

What am I doing wrong?

[Patrick Kettner]

The error mentions that incomplete does not exist on undefined. That means that whatever you are trying to use onCompleted on does not exist. In your code, that would be chrome.webNavigation. Checking the docs for that API, 

https://developer.chrome.com/docs/extensions/reference/webNavigation/, it shows that the permission “webNavigation” is needed, which is missing in your manifest file. 

Add it, and you’ll be good to go. 

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