github-doc-json-view.js

// ==UserScript==
// @name         GitHubDocJSONView
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Show link icon in github doc
// @author       Abhijit Hota (abhijithota.me)
// @match        https://docs.github.com/en/rest/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    const responseBlocks = document.querySelectorAll("div[class*=RestCodeSamples_responseCodeBlock]");

    responseBlocks.forEach((block) => {

        const jsonCode = block.querySelector("code").textContent;
        const encodedJSON = btoa(jsonCode);
        const href = `data:application/json;base64,${encodedJSON}`;

        const linkBtn = Object.assign(document.createElement("a"), {
            textContent: "View",
            className: "float-right btn-octicon",
            target: "_blank",
            href,
        });

        block.previousSibling.append(linkBtn);
    })
})();