SharePoint helper functions for doing common admin tasks from the console.
k.js is meant for on premises (i.e. SharePoint 2013, 2016 and 2019)
k365.js is for SharePoint Online (i.e. Microsoft 365, yourtenant.sharepoint.com )

k.js is written as a userscript, so you can include it as a file for autoloading in Tampermonkey or Greasemonkey.
k.js logs a "k" to the console to indicate it's been loaded.
All commands are in the k namespace, e.g.

await k.fetch("/web/allproperties")

lists out all the web properties.

await k.getToken()

fetches a bearer token from /_api/contextinfo you can use for whatever

await k.ChangeWebProp("Title","My new site title")

Changes the title of the site you're on

Chromium or Firefox browser
Tampermonkey or Greasemonkey
A SharePoint Site