How do I use version numbers with JSON And show the version numbers in html

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HTML

JSON

HTML5

So I have a server that Runs 24/7 and I have a .JSON file on it I have defined everything but what I need to know is how can my .html file find that one .JSON file read it, compare the current json to the new json, and display it.

Here is what I am trying to do.
I have 1 server That hosts a .JSON file then I have a computer that has a .JSON file now when someone opens the html I made I want it to display the version number of the JSON file on the computer and the one on the server.
So How do I do it?!?!

---

And For Help Here Are my .JSON files.

SERVER SIDE:
manifest.json:

{
  "manifest_version": 2,
  "name": "-",
  "version": "1.2.2"
}

COMPUTER SIDE:
manifest.json:

{
  "manifest_version": 2,
  "name": "-",
  "version": "1.2.0"
}

---

And here is what I want to happen in the html:

Your Version: 1.2.0
Actual/Current Version: 1.2.2

So How do I do this?!