Please, please, when talking about runtime stuff, call it #JavaScript, not #TypeScript—String.prototype.toLowerCase() is a JavaScript feature, not a TypeScript feature, so your tutorial "How to change my string to lower case in TypeScript" doesn't make sense
Please, please, when talking about server-side features, call it #NodeJS, not JavaScript—I know, it's also JS, but people WILL get confused, because JavaScript is mostly understood as a totum pro parte for client-side JavaScript