Promises are a built-in concurrency primitive that's been part of JavaScript since ES6 in 2015. The Promise class has been included in Node.js since v4.0.0. That means, unless you're on an unmaintained version of Node.js, you can use promises without any outside libraries.

Private class fields are a Stage 3 TC39 proposal. Even though they're still experimental, you can use private class fields in Node.js 12 without flags or transpilers. In this article, I'll explain the basics of private class fields and how they interact with existing paradigms, like Object.keys() and assert.deepStrictEqual().

When running MongoDB in production, you may see queries that should be fast, but instead are exceedingly slow. For example, my Node.js apps have seen a findOne() on a collection with only 1 document take over 1 second.

It's finally happened: nearly 4 years after the import keyword was introduced in ES6, Node.js introduced experimental support for ES6 imports and exports. In Node.js 12, you can use import and export in your project if you do both of the below items.

Mongoose 5.5 was released earlier this week. This release includes 12 new features and a performance improvement. The two features I'm most excited about are hooks for user-defined static functions and the ability to pass a function to populate's match option. In this article, I'll introduce these two new features and show how they can save you some design headache.

npx is a separate executable that has been shipped alongside Node.js and npm since 2017. npx is a flexible tool for running node packages that makes installing npm packages globally largely obsolete. In this article, I'll demonstrate how npx lets you avoid npm install -g, and show a couple other cool things npx can do.

npm is the de facto package manager for Node.js, roughly analagous to pip for Python or Maven for Java. There are several alternatives, like Yarn and Turbo, but npm is automatically installed when you install Node.js. The npm registry is huge, with over 800k packages at the time of this writing, so there's a package for almost everything. In this article, I'll provide a brief overview of what npm can do for you.

The String#replace() function replaces instances of a substring with another substring, and returns the modified string. This function seems simple at first, but String#replace() can do a whole lot more than just replace 'foo' with 'bar'. In this article, I'll explain some more sophisticated ways to use String#replace(), and highlight some common pitfalls to avoid.

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