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Bun vs Node.js - A Recipe for JavaScript Success

Posted on:May 23, 2023 at 03:57 PM

“In theory, there is no difference between theory and practice. In practice, there is.” - Yogi Berra

In the world of JavaScript runtime environments, Node.js has long reigned supreme. However, like any technology, it has its strengths and weaknesses, which have paved the way for new contenders. One such upstart is Bun, a newcomer that aims to take on Node.js at its own game. But how do they stack up? Let’s dive in.

Introduction to Node.js and Bun

Node.js is a JavaScript runtime built on Chrome’s V8 JavaScript engine, allowing developers to create scalable network applications. It’s used by millions of developers worldwide and has a robust ecosystem of libraries and frameworks.

// Node.js "Hello, World!" example
const http = require("http");

  .createServer((req, res) => {
    res.writeHead(200, { "Content-Type": "text/plain" });
    res.end("Hello, World!\n");

console.log("Server running at");

Bun, on the other hand, is a lightweight JavaScript runtime that aims to provide a more efficient, modern, and simpler alternative to Node.js.

// Bun "Hello, World!" example
import { serve } from "";

for await (const req of serve({ port: 8080 })) {
  req.respond({ body: "Hello, World!\n" });

Now that we have an overview, let’s move on to comparing the two.

Pros and Cons



  1. Mature and Robust: Node.js has been around since 2009, and it has a robust ecosystem with a vast array of libraries and frameworks.
  2. Large Community: Node.js has a massive community, which means more resources, tutorials, and solutions to common problems.


  1. Callback Hell: While improvements like promises and async/await have been added, Node.js is infamous for “callback hell” due to its asynchronous nature.
  2. Global Node_Modules: Node.js installs dependencies globally, which can lead to version conflicts and a bloated node_modules folder. It’s the only folder that grows faster than your to-do list!



  1. Lightweight: Bun is designed to be minimal and efficient, leading to faster startup times.
  2. No Node_Modules: Bun uses a different approach for managing dependencies, which avoids the node_modules folder entirely.


  1. New and Less Established: As a new runtime, Bun doesn’t have the same level of community support or the extensive ecosystem that Node.js enjoys.
  2. Less Compatibility: Some Node.js libraries and tools may not work out of the box with Bun.


Choosing between Node.js and Bun depends on your specific use case. Node.js is a proven, robust solution with a vast ecosystem, while Bun offers a lightweight and efficient alternative that avoids some of Node.js’s pitfalls.

Remember, no tool is a silver bullet, and as developers, it’s our job to pick the right tool for the job. Or as a wise man once said, “If all you have is a hammer, every problem looks like a nail.”

And if you still can’t decide, just flip a coin. It’s what I do when choosing between two JavaScript libraries! Jokes aside, happy coding, everyone!