Put your Juniper configuration in the first textarea, then click on the button. It'll convert the configuration to a series of set commands.
Tim Price wrote a PHP script to convert Juniper conf to a series of set commands. You can find it on this github. I just rewrote it in JS and add an interface. You can find the source code on this github.
My email address : rick@gnous.eu
My Github page : here we go
All the code is under GPL3 licence.
It can be used offline, the parsing is done locally, on your PC.