How To Send Push Notifications on Flutter Web (FCM) If you are using Firebase then you are probably familiar with Firebase Cloud Messaging. The setup on Flutter web is very different than mobile and other plugins you are probably used to. Setting Up Open your web/index.html and look for the following script. If you do not have one you can add it now in the tag. We need to modify it to support the FCM service worker. The important thing we need to do is comment out the flutter\ service\ worker.js so that we will not get 404 errors when registering the FCM service worker. Now create a new file…