Making mongoose.js queries run synchronously

If you are using node.js then u should use https://github.com/caolan/async

when you have to fetch data from multiple collections you have to chain your queries multiple times.

It will make your code complex and difficult to read and no modularity. Use async to create
modularity using mongodb and node.js

Example Code from my project :

var async = require('async');

var createGlobalGroup = function(socket, data) {
    async.waterfall(
    [
    /**
     * this function is required to pass data recieved from client
     * @param  {Function} callback To pass data recieved from client
     */

    function(callback) {
        callback(null, socket, data);
    },
    /**
     * Step 1: Verify User
     */
    verifyUser,
    /**
     * Step 2: Check User Access Rights And Roles
     */
    checkUserAccessRightsAndRoles,
    /**
     * Step 3: Create Project
     */
    createNewGlobalGroup], function(err, result) {
        /**
         * function to be called when all functions in async array has been called
         */
        console.log('project created ....')
    });
}
verifyUser = function(socket, data, callback) {
//do your query
    /**
     * call next function in series
     * provide sufficient input to next function
     */
    callback(null, socket, data, {
        "isValidUser": true,
    });
}

checkUserAccessRightsAndRoles = function(socket, data, asyncObj, callback) {
    //do your query
    if(condition) {
        callback(null, socket, data, {
            roles: result,
            "isValidUser": asyncObj.isValidUser,
            "userId": asyncObj.userId,
        });
    } else {
    //no call back
    }
}

var createNewGlobalGroup = function(socket, data, asyncObj, callback) {
//wanna stop then no callback
}