Juniper Jweb is a GUI based tool for simplifying Juniper router configurations. It is possible to configure juniper devices using Jweb GUI for some routine setup tasks. However, for complex configurations, you will need to use Juniper CLI. Juniper JUNOS supports Jweb for most devices.
http://www.juniper.net/techpubs/en_US/junos14.1/topics/task/configuration/j-web-basic-settings.html
It is possible to edit configuration file using Jweb. C Heck out the link above for more details. It is comparable with Cisco Configuration Professional (CCP).
Step by step configuration or SRX routers with JWEB:
http://forums.juniper.net/jnet/attachments/jnet/Learning/47/1/Day%20One%20Configuring%20SRX%20Series%20with%20J-Web.pdf