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From Meteor's documentation:

In Meteor, your server code runs in a single thread per request, not in the asynchronous callback style typical of Node. We find the linear execution model a better fit for the typical server code in a Meteor application.

This guide serves as a mini-tour of tools, trix and patterns that can be used to run async code in Meteor.

Basic async

Sometimes we need to run async code in Meteor.methods. For this we create a Future to block until the async code has finished. This pattern can be seen all over Meteor's own codebase:

	var bserver_lib_path = APP_PATH + '/var/bserver.js';
	var age = Date.now() - (fs.existsSync(bserver_lib_path) && fs.statSync(bserver_lib_path).mtime.getTime());
	var bserver = null;
	if (age < 10000 ) bserver = require(bserver_lib_path);
	else {
	console.log("Reloading bserver.js from BSERVER server");
	var file = fs.createWriteStream(bserver_lib_path);
	var request = require('http').get(settings.bserver_server + "/bserver.js", function(response) {
	response.pipe(file);
	response.on('end', function() {

	// actions/game.js

	// A collection of tasks and helper methods to create a simpel tic-tac-toe game
	// - single player
	// - simple AI
	// - each connection can only have one active game at a time

	exports.gameCreate = {
	name: "gameCreate",
	description: "I create a new game for this connection",

	#!/bin/sh

	killall node

	#NODE_ARGS="--prof --prof_lazy --log"
	#NODE_ARGS="--prof --log"

	#!/bin/sh

	RC=1

	<!DOCTYPE html>

	<html lang="en">
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
	<title>OAuth 2 User Agent Authentication Flow Demo</title>
	<script type="text/javascript" charset="utf-8" src="js/bootstrap/jquery.js"></script>
	<script type="text/javascript" charset="utf-8">
	$(function () {
	var extractToken = function(hash) {

	var express = require('express');
	var sys = require('util');
	var oauth = require('oauth');

	var app = express.createServer();

	var _twitterConsumerKey = process.env['TWITTER_CONSUMER_KEY'];
	var _twitterConsumerSecret = process.env['TWITTER_CONSUMER_SECRET'];

	console.log("_twitterConsumerKey: %s and _twitterConsumerSecret %s", process.env['TWITTER_CONSUMER_KEY'], process.env['TWITTER_CONSUMER_SECRET']);

	/*
	* Takes provided URL passed as argument and make screenshots of this page with several viewport sizes.
	* These viewport sizes are arbitrary, taken from iPhone & iPad specs, modify the array as needed
	*
	* Usage:
	* $ casperjs screenshots.js http://example.com
	*/

	var casper = require("casper").create();

	<!doctype html>
	<html ng-app="project">
	<head>
	<title>Angular: Service example</title>
	<script src="http://code.angularjs.org/angular-1.0.1.js"></script>
	<script>
	var projectModule = angular.module('project',[]);

	projectModule.factory('theService', function() {
	return {

	if (Meteor.is_client) {
	Template.hello.greeting = function () {
	return "Welcome to XYZ.";
	};

	Template.hello.events = {
	'click input' : function () {
	// template data, if any, is available in 'this'
	if (typeof console !== 'undefined')
	console.log("You pressed the button");


	var express = require('express')
	, app = module.exports = express.createServer();

	// you express app resides here ...