JSFiddle - React, Tailwind, and code Playground

HTML

Expected Output: "key=update.repositories:value=xime+mcsg+mcsg-maps;key=server.minPlayersToStart:value=12"
<br>
Output: <span class="encData"></span>

JavaScript

var data = "key=update.repositories&value=xime+mcsg+mcsg-maps&key=server.minPlayersToStart&value=12";
data.replace(/&v/g, ":v");
data.replace(/&k/g, ";k");

$(".encData").text(data);