UserScript for jsoneditoronline.org for use when editing the JSON of TagPro maps. The UserScript adds a "Fix Portals" button to the JSON editor that edits the json in the editor so the cooldown of all portals is zero.

json-portals.js

// ==UserScript==
// @name         0 Portal Cooldown for JSON Editor Online
// @namespace    http://www.reddit.com/user/snaps_
// @version      0.1
// @description  Add a button for automatically setting portal cooldowns to 0 in JSON Editor Online.
// @author       snaps_
// @match        https://*.jsoneditoronline.org/
// @match        http://*.jsoneditoronline.org/
// @grant        none
// @run-at       document-end
// ==/UserScript==

/*
 * We use two JSON editor online global objects below, `app` and `codeEditor`.
 * codeEditor is of type JSONEditor, which can be inspected on the page, and 
 * app is just an object with various utility methods.
 */
// Create and style button to be added to editor.
var button = document.createElement("button");
button.title = "Set cooldown to 0 for all portals";
button.textContent = "Fix Portals";
button.style.width = "auto";
button.style.background = "none";
button.style.padding = "0px 5px";
button.style["background-color"] = "rgb(224, 231, 245)";
button.style["font-weight"] = "bold";

// Add button to editor.
var codeMenuLink = document.querySelector("#codeEditor .menu a");
var codeMenu = document.querySelector("#codeEditor .menu");
codeMenu.insertBefore(button, codeMenuLink);

// Set portal cooldpwns to 0 on button click.
button.addEventListener("click", function(e) {
    try {
        var json = codeEditor.get();
        if (json.portals) {
            // Set portal cooldowns to 0.
            for (var loc in json.portals) {
                json.portals[loc].cooldown = 0;
            }
        }
        codeEditor.set(json);
        codeEditor.compact();
    } catch (e) {
        // JSON not parsed correctly, pass error through normal notification method.
        app.notify.showError(app.formatError(e));
    }
});