Konstantin Tarkus

Apr 14, 2021

Generate TypeScript definitions from a PostgreSQL database schema

I’ve been enjoying using Knex.js database client for quite some time when implementing GraphQL API backends. One thing that it currently lucks though, is the ability to generate strongly typed (TypeScript) models from the actual database schema. Luckily, there is a solution! Assuming you have a database table that looks…

JavaScript

2 min read

JavaScript

2 min read

Mar 23, 2021

Using Validate.js via a fluent TypeScript interface

When it comes to user input validation, particularly when designing (RESTful, GraphQL) APIs, it’s important to have these objectives in mind: Validator needs to support various data types such as emails, mobile phone numbers in different locales, credit cards, etc. Well tested and already used in production by many companies. …

JavaScript

2 min read

JavaScript

2 min read

Sep 5, 2020

Google Cloud SQL — Tips & Tricks

When creating a new Cloud SQL instance… Ensure that the instance name is picked wisely. You may find it helpful if it remains short, and contains the Cloud SQL edition (MySQL, PostgreSQL, SQL Server) and version number. For example, pg12.

Google Cloud Platform

6 min read

Google Cloud Platform

6 min read

Aug 28, 2020

Demystifying NODE_ENV var

There might be some confusion regarding using NODE_ENV variable in Node.js apps. A few things you need to be aware of: (1) Do not set NODE_ENV to anything other than production, development or test. When you deploy your app to let’s say Google Cloud Functions, the NODE_ENV variable will always…

Nodejs

2 min read

Nodejs

2 min read

Published in Watchlist.io

·Jul 20, 2019

Creating a Watchlist from Stock Chart Patterns

If you normally start building your swing- or day-trading watchlist starting from tech analysis, here is a good tool that can help you accelerate this process. Step 1: Decide which stocks or other financial instruments to trade For example, in the case with swing trading, you may prefer stocks of…

Stock Market

1 min read

Creating a Watchlist from Stock Chart Patterns

Stock Market

1 min read

Jul 20, 2019

Global Reducer (hook) in React

As you probably know React.js provides us with these two helpful hooks — React.useReducer() and React.useContext(). You may think that combining them in a creative fashion would give you a perfect replacement for Redux? Not so fast :) First, let’s see what’s the problem with Context-based implementation and how it…

React

2 min read

React

2 min read

Published in Level Up Coding

·Mar 18, 2019

Integrating Facebook Customer Chat into a React.js App

With Facebook Customer Chat widget you’re now able to connect with your website visitors (customers) even after they left your site. How cool is that ;) You start by creating a Facebook Page for your app or product. Find your Page ID in the About section — you will need…

JavaScript

2 min read

Integrating Facebook Customer Chat into a React.js App

JavaScript

2 min read

Dec 17, 2017

Common JavaScript tasks without Redux

Have you noticed this trend that many JavaScript developers don’t know how to solve pretty basic tasks in their web apps without using Redux? It starts like this — a developer has two or more components in different parts of the UI and struggling to organize a communication channel between…

React

4 min read

React

4 min read

Published in codeburst

·Nov 26, 2017

Custom errors and error reporting in GraphQL

First of all, big thanks to Facebook developers for open sourcing and maintaining GraphQL.js library. It can’t express how well it works for me and my team and I like really how simple yet flexible it is. As Albert Einstein once said: Everything should be as simple as it can…

GraphQL

3 min read

GraphQL

3 min read

Sep 3, 2017

How to call C/C++ code from Node.js

It might be NOT that hard as you think! Let’s see you can you can call C/C++ code or use a native library from a Node.js app. Q: Why would I need to call C/C++ code? …

JavaScript

5 min read

JavaScript

5 min read