May 13, 2018

JavaScript Async/Await: Serial, Parallel and Complex Flow

If you have experience on ASP.NET MVC then probably you are familiar with async/await keywords in C#. The same thing is now in JavaScript. Before that, Callbacks and Promises are used for asynchronous code. Async/await is built on top of promises and non blocking. The power of Async/await provides asynchronous code look like synchronous code. In this article, we will go through serial/chain and parallel flow and implement a complex flow using Async/Await.

Read Also: JavaScript Promises: Understanding Error Handling with Example

Apr 1, 2018

Introducing HISAAB – Online Tool To Track Expenses With Your Voice

It’s time to welcome HISAAB, a simple online speech recognition app, for tracking your expenses with your voice i.e. no need to type. It will help you to note your expenses and calculate the total amount quickly. It allows you to Copy, Email, Save or Print the data. It supports English and Hindi languages.

Feb 14, 2018

Visual Studio Code: Debugging ES6 Mocha tests with Babel

In my post, I explained how to test server side REST APIs in Node.js using Mocha, Sinon and Chai. I used ES6 test methods for this and Babel is used to execute it. As test methods are executed at development end, so NO need to transpile ES6 to ES5 first and then debug the converted files. You can directly debug ES6 code with Babel.

Feb 1, 2018

WordPress: Disable 404 Redirect to Homepage

If you don’t know what 404 error is, It is an error displayed on when a user requests a web page that couldn’t be found on their server (i.e. the requested webpage is not available). In this case, If you are redirecting (302 redirects) to home page then it is confusing for end user. Definitely, you should avoid 302 redirecting for non-existent URL. Probably you don’t want to send a low quality signal to Google and other engines if they are testing how 404’s are being handled by requesting a noexist page. The best solution is to create custom 404 page having search box saying “Did you mean …?”

In this post, we will see how to prevent 404 Redirect to Homepage in WordPress.

Jan 31, 2018

ASP.NET MVC: Display Total and Avg in Table footer in Razor Views

There are various cases in which you may want to display results from aggregate functions (Sum, Avg, Count, Min, Max) performed over the columns in the grid in their footer. This post explains how to display aggregate functions in ASP.NET MVC Razor views.

Used Environment for this post: VS 2015 Update 3, ASP.NET MVC 5

For ASP.NET Web Forms, Read following post:
Displaying Total in ASP.NET Gridview Footer Row Without using Template Field

Jan 28, 2018

HTTP to HTTPS Migration, WordPress and SEO

Before I start this article, I would like to ask one question to you, How many HTTPS links do you see in first page of Google search result? Generally, I get more than 50% for my search queries and major top links belong to HTTPS. It is self explanatory how important HTTPS and SSL is. As SSL is mandatory for safely processing transaction e-commerce website, but here I am not going to talk about security and safety, my concern is SEO. The web is moving toward using HTTPS encryption by default and it is encouraged by Google with announcement HTTPS as a ranking signal in 2014. Chrome and Firefox browsers started to display warning for HTTP (Non secure) websites. So you decided to move on HTTPS. Hold a minute and see the challenges. you will get many examples on Google saying huge drop in traffic after moving HTTPS if not implemented properly. So you must aware of the challenges. In this post, we will move a WordPress website to HTTPS, Setup free SSL and update dependencies to meet SEO guidelines. It is assumed Apache server is used in Ubuntu server.

Jan 15, 2018

Azure Functions + Cognitive Services: Automate Image Moderation

Generally, User submitted images (profile pictures, social media posts, and business documents) are needed to be moderated to protect business and quality. If a large number of images are submitted in an application then manual moderation is time consuming and is not instantaneous. This post explains how to automate image moderation using Azure functions and Cognitive Services. Automated moderation applies machine learning and AI to cost-effectively moderate at scale, without human involvement.

Dec 19, 2017

Node.js: Sinon Stub and Passport Authenticate

In my last post, I spent some hours to create a stub to skip passport.authenticate method for REST API testing. So, I decided to write a separate post on the same. Before we get started, let’s take a look on how auth middleware is implemented:

Dec 18, 2017

Node.js: REST API Testing using Mocha, Sinon and Chai

In my recent post, I covered how to implement token based authentication using Passport, JWT and bcrypt. Let’s extend this post and look into testing REST APIs or server side methods in Node.js using Mocha, Chai and Sinon.

Mocha: It is a test runner to execute our tests.
keywords in code = Describe, It, before, after…etc

Chai: It is an assertion library and allows to write code like writing regular english.
keywords in code = should, assert..etc.

Sinon: It provides test spies (fake functions to track executions), stubs (replace functions with our fake implementation) and mocks (predefined fake method with behaviour).

Dec 18, 2017

JavaScript: Null vs Undefined vs Undeclared

For a beginner, it is painful to understand two distinct things null & undefined in JavaScript and use them properly. I noticed many people consider and treat undeclared variable as undefined which is wrong perception. In this article, we will go through null, undefined, empty, NaN and undeclared variables and see how to handle them in different conditions.

Dec 17, 2017

Token Based Authentication with Node.js, Express, Mongoose and Passport

This tutorial explains how to implement REST API and Token based authentication in Node.js, Express, Mongoose environment. We are going to use JWT (JSON Web Token) + bcrypt (password hashing algo)+ Passport (authentication middleware to integrate different login strategies) combination. So jsonwebtoken, bcrypt-nodejs and passport-jwt javascript libraries will be used. It is assumed you are familiar with Node.js, MongoDB and ES6 basics.