JavaScript error messages in the browser console

Software errors may occur during page loading and when executing JavaScript code. They may also appear when performing certain actions by the user.

Errors indicate the presence of a malfunction and a message describing them is recorded in the browser log. You can see it using the developer tools.

This is how JavaScript errors are output to the console.

Some errors appear only when installing certain plug-ins or browser settings. For example, the ad blocker plugin will block the loading of tags, and then calls to the tag functions in your code (for example, for sending events) will return an error.

Also, errors may be of a precautionary nature. For example, when a page uses an outdated feature that will be disabled in future versions of the browser.

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