TTL Indexes in MongoDB are very useful for storing data like logs or user sessions. The documents will remove itself after certain amount of time which specify by the index. This tutorial will be done in both JavaScript and TypeScript using Node.js with node-mongodb-native, which is the official MongoDB Node.js driver.
By default, VSCode uses its own TSC (TypeScript Compiler), which is usually not the latest version of TypeScript. To use the latest features, we'll need to install TypeScript in our package's dependencies and select the version from node_modules in VSCode (.vscode/settings.json).
Knowing whether a link is internal or external is essential for setting rel in HTML a tag. For an external link, noreferrer noopener nofollow is usually recommended. To test a full URL or relative path in JavaScript/TypeScript, we'll be using URL constructor. It's available in both browsers and Node.js.
Instead of using Telegram bot frameworks like telegraf.js and node-telegram-bot-api, I created a Telegram sender with less than 100 lines of code in Node.js to simply send notifications to myself. And there is nothing wrong with using a full-featured framework, but building your own is definitely easier to maintenance.
I created a simple key-value LRU (Least Recently Used) cache module for storing user sessions of this blog. And with the power of Javascript ES6 Map object it's easy to implement a efficient cache system. In this guide we'll be building this module from scratch in Node.js with Typescript.
I recently wrote a very simple IP address based rate limit module called rt-limit to throttle requests for this blog. Although rate limiting is more commonly done on reverse proxy like Nginx and Apache, being able to manage traffic on your own back-end server is always more flexible.
I wrote a dead simple Javascript library called pswd-generator to generate password for this blog. In just 23 lines of code, I was able to build a cryptographically-secure password generator thanks to Node.js's native crypto module. And this guide will show you how it's done with Typescript.
