Bun: Good replacement for Node.js?

I was following Bun project for some time since it released its 0.1.1 version by its creator Jarred Summer. It promised to faster drop-in replacement for Node.js with a native bundler, transpiler, task runner, and npm client built-in. It uses Zig as the programming language and JavascriptCore as its JS engine.

They release v0.5.1 and I am excited about it cause it, at last, implemented a few native Node.js APIs which were missing like dns and tls. When I first tried to build a REST API with Postgres connection I failed as it hadn't implemented modules required by pg module to run like dns and tls.

Basic REST API

export default {
  fetch(req) {
    return new Response("Hello from Bun!");
  },
};

or you can use Bun.serve:

Bun.serve({
  fetch(req) {
    return new Response("HI!");
  },
});

and just use bun index.ts or bun run index.ts and your API is ready.

Use bun install <package name> to install any package from npm.

Trying with real project

I was excited to use bun with my project. So, when I saw Bun implemented dns and tls module I jumped in, updated bun, ran bun install to install dependencies, crossed my finger and executed bun run dev and voila everything worked as I ran some Node.js projects.

Bun's main selling point is its fast at startup than Node.js as its using JavascriptCore.

Do have a look at Bun, you will find the benchmark score in the landing page itself and it's all about speed.

Keeping learning, keep building.