How to check if notifications is already allowed by user in google chrome?
Check the permission property of the Notification object:
if (Notification.permission !== "granted") { // ask for permission
Alongside Notification.permission as answered by Denys Séguret there is the newer, less well-supported but more general Permissions API.
Here's a quick usage example, based on the one from MDN:
function handlePermission() { return navigator.permissions .query({name:'notifications'}) .then(permissionQuery) .catch(permissionError);}function permissionQuery(result) { console.debug({result}); var newPrompt; if (result.state == 'granted') { // notifications allowed, go wild } else if (result.state == 'prompt') { // we can ask the user newPrompt = Notification.requestPermission(); } else if (result.state == 'denied') { // notifications were disabled } result.onchange = () => console.debug({updatedPermission: result}); return newPrompt || result;}////handlePermission();