Check it out
http://www.sharontools.com/online-lab/device/?q=juniper3
http://www.sharontools.com/online-lab/
Login: lab
password: 123456
The password for device access keeps changing from time to time. You can see it at the bottom of the labs in the page http://www.sharontools.com/online-lab/
Probably, you may need to register with the site to access the labs
Also, find config generator here:
https://www.juniper.net/support/tools/vpnconfig/#localSite
Juniper support site authorization code: JNETCOMM2006
Check this out
https://sk1f3r.ru/jlab