How can we send messages from the main process to renderer process in Electron

Question

To send a message back to the renderer you would use:

win.webContents.send('asynchronous-message', {'SAVED': 'File Saved'});

And receive it like this:

ipcRenderer.on('asynchronous-message', function (evt, message) {
    console.log(message); // Returns: {'SAVED': 'File Saved'}
});

Where asynchronous-message is simply the channel you’re sending it to. It can literally be anything.

webContents.send Docs