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I need to set the UserAgent in electron to include the touch flag since I am writing the application for touch screens and it doesn't seem to auto detect that it is running on a touch screen.

Any help would be nice, I already tried setting it in the BrowserWindow.loadURL options param.

function createWindow () {
   win = new BrowserWindow({width: 800, height: 600});
   win.loadURL('http://www.whoishostingthis.com/tools/user-agent/',
     {userAgent: 'Chrome'});
   win.on('closed', () => {
     win = null
                For future reference: If you want to extend the user agent instead of overwriting it, you can get the original user agent via win.webContents.getUserAgent().
– Tsunamis
                Nov 30, 2017 at 9:21
You can set the User-Agent header in the main process using onBeforeSendHeaders:
import { session } from 'electron';
session.defaultSession.webRequest.onBeforeSendHeaders((details, callback) => {
  details.requestHeaders['User-Agent'] = 'SuperDuperAgent';
  callback({ cancel: false, requestHeaders: details.requestHeaders });
                Make sure you have version >=0.36.1 for this. Otherwise it won't work. Just spent way too long figuring that out.
– ccnokes
                Feb 29, 2016 at 22:52
                @ccnokes No, you just need to provide a filter (or undefined) before callbacks parameters ;)
– Alexandre Daubricourt
                Feb 3, 2018 at 15:28
Before loading file, you can call BrowserWindowInstance.webContents.setUserAgent()
mainWindow.webContents.setUserAgent(mainWindow.webContents.getUserAgent() + " Custom Value");
mainWindow.loadFile('renderer/index.html');
Works with electron 3.0.4 Previous solutions didn't work for me.
Electron 8.2.5 Update
In newer versions, setUserAgent method will be deprecated.
Instead, use this;
mainWindow.webContents.userAgent //to get
mainWindow.webContents.userAgent = "Something" //to set
                While this works for the the initial window, links clicked within that window seem to lose the user agent. Passing { userAgent: "my custom ua" } as an option to the original loadURL() call seems to get around this.
– Kurt
                Mar 8 at 20:51
                @Kurt It's been a while since I was mingling with electron. I'm assuming that you are using target=_blank in that case you are creating a new window, so that wouldn't use the same user agent. In that case you should check out setWindowOpenHandler method. You can modify default behavior.
– siniradam
                Mar 14 at 19:24
        
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