Fork all repositories from a user on GitHub

forkAllGitHubRepos.js

var totalForkCount;
var curForkCount=0;
var errorForkArray = new Array();

function initProcess(){
	var user = window.location.pathname.split('/')[1];
	var pageNo = 1;
	var hrefArray = new Array();
	while(hrefArray.length % 30 == 0){
		var resp = sendSyncAjax("https://github.com/"+user+"?tab=repositories&page="+pageNo);
		hrefArray = hrefArray.concat(getReposFromHtml(resp));
		pageNo++;
	}
	totalForkCount = hrefArray.length;
	forkAll(hrefArray);
}

function getReposFromHtml(response){
	var text = response.responseText;
	var parser = new DOMParser();
    var html = parser.parseFromString(text, "text/html");
	var repoCount = html.getElementsByClassName('d-inline-block mb-1').length;
	var hrefArray = new Array();
	for(var i=0; i<repoCount; i++){
		hrefArray.push(html.getElementsByClassName('d-inline-block mb-1')[i].getElementsByTagName('a')[0].href);
	}
	return hrefArray;
}


function sendSyncAjax(url){
	var xhr = new XMLHttpRequest();
	xhr.open('GET', url, false);
	xhr.send(null);
	return xhr;
}

function forkAll(hrefArray){
	var div = document.createElement('div');
	div.style.display='none';
	div.id='hdiv';
	document.body.appendChild(div);
	for (var i=0; i<hrefArray.length; i++){
		loadPageAndFork(hrefArray[i]);
	}
}

function loadPageAndFork(url){
	var xhr = new XMLHttpRequest();
	xhr.open('GET', url, true);
	xhr.onreadystatechange = function() {
	    if (this.readyState == 4 && this.status == 200) {
	       	var parser = new DOMParser();
	    	var html = parser.parseFromString(xhr.responseText, "text/html");
	    	if(html.getElementsByClassName('btn-with-count').length == 5){
	    		var actionUrl = html.getElementsByClassName('btn-with-count')[3].action;
	    		var formData = html.getElementsByClassName('btn-with-count')[3].getElementsByTagName('input');
	    		var postData = 'utf8=%E2%9C%93&authenticity_token='+encodeURIComponent(formData[1].value);
	    		sendForkRequest(actionUrl, postData);
	    	}else{
	    		errorForkArray.push(url);
	    		if(totalForkCount == curForkCount+errorForkArray.length){
	    			window.alert("Done forking "+totalForkCount+" repositories. Error with these: "+errorForkArray);
	    		}
	    	}
	    }
	};
	xhr.send(null);
}

function sendForkRequest(actionUrl, postData){
	var xhr = new XMLHttpRequest();
	xhr.open('POST', actionUrl, false);
	xhr.onreadystatechange = function() {
		if(this.readyState == 4){
			if (this.status == 200) {
		    	curForkCount++;
		    }else{
		    	errorForkArray.push(actionUrl);
		    }
		    if(totalForkCount == curForkCount+errorForkArray.length){
	    		window.alert("Done forking "+totalForkCount+" repositories. Error with these: "+errorForkArray);
	    	}
		}
	    
	}
	xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	xhr.send(postData);
}

initProcess();

The above javascript is built and tested with Firefox 50.1.0.

Access any page on the GitHub user's profile whose repositories need to be forked. Open firebug console and execute the above javascript.

Tried to create a bookmarklet to make it a simpler process, but Content Security Policy on GitHub blocks the execution.

Please Help Me,
I need to fork all repos from "https://github.com/lineageos" to "https://github.com/RebaseOS". I tried it with your code but it doesnt worked...