I remain very impressed with JSLink and what it can do, particularly related to individual site columns. While preparing a presentation for the local Office 365 Saturday event here in Brisbane, Queensland I realised that while it is easy to connect a JSLink script to a site column using PowerShell, there have been many occasions on client sites where I have been limited to Site Collection administrator access permissions with no access to a server.
And of course it is . . .
var context = new SP.ClientContext.get_current();
var web = context.get_web();
var field = web.get_availableFields().getByTitle("My Site Column");
var jsl = field.get_jsLink();
This can be run from the console in a browser – just make sure you use your site column name and set the path to your script. You do also need to be logged in as a Site Collection administrator. Oh, and it works for Office 365 too.
There is also a copy on GitHub if you prefer.