@yateeshkumark using the API is the only way I know to do it. If all you want is the ID and name of the policy, then take a look at jss_helper. I use that to grab the list of policies into a file. If you need more info, then you'll probably need to look at writing a specific API call that dumps all of the policy data out into a CSV or something. Out of the box there is no way that I know of to export all of the policies.
If it's a one off I think You can probably did it pretty easy directly through the API test page, this is usually at /api from the main JSS URL. There is a GET Policies section and I am pretty sure the "Try it Out" will return a list of policies you can copy and paste. It would also give you the commands you would need to do if you wanted to automate this in some manner.
