Hello World in Bun

Hello World in Bun || MAK Writing House

Hello World in Bun

Bun is a new JavaScript runtime that is quickly gaining popularity due to its speed, reliability, and ease of use. Bun is built on top of the WebKit JavaScript engine and provides a native HTTP server, making it ideal for developing high-performance web applications.

In this blog post, we will walk you through the steps of writing a simple “Hello, World!” application in Bun. We will also explain some of the key features of Bun and why it is a good choice for JavaScript development.

Getting started with Bun

To get started with Bun, you will need to install the Bun CLI. You can do this using the following command:

npm install bun

Once Bun is installed, you can create a new Bun project by running the following command:

bun init

This will create a new directory called my-bun-project with a basic Bun project configuration.

To write a “Hello, World!” application in Bun, simply create a new file called index.js in the my-bun-project directory and add the following code:

// index.js

console.log("Hello, World!");

Once you have saved the file, you can run your Bun application using the following command:

bun run

This will start the Bun HTTP server and listen on port 3000. You can now open your web browser and navigate to http://localhost:3000 to see the “Hello, World!” message.

Key features of Bun:

Bun offers a number of features that make it a good choice for JavaScript development, including:

  • Speed: Bun is significantly faster than other popular JavaScript runtimes such as Node.js and Deno. This is due to a number of factors, including the use of the WebKit JavaScript engine and the native HTTP server.
  • Reliability: Bun is built on top of the mature and well-tested WebKit JavaScript engine. This makes Bun a very reliable choice for developing production-ready web applications.
  • Ease of use: Bun is very easy to use, especially if you are already familiar with Node.js. Bun uses the same JavaScript API as Node.js, so you can easily port your existing Node.js applications to Bun.


Bun is a new and exciting JavaScript runtime that offers a number of advantages over other popular runtimes such as Node.js and Deno. Bun is faster, more reliable, and easier to use than other runtimes.

If you are looking for a new JavaScript runtime to use for your next project, I highly recommend checking out Bun.

Additional tips:

Here are a few additional tips for writing Bun applications:

  • Use the native HTTP server: Bun’s native HTTP server is very fast and efficient. I recommend using the native HTTP server for all of your Bun web applications.
  • Use TypeScript: Bun has excellent support for TypeScript. I recommend using TypeScript for all of your Bun projects to improve the quality and maintainability of your code.
  • Use the Bun CLI: Bun provides a powerful CLI that can be used to manage your Bun projects and run Bun scripts. I recommend learning how to use the Bun CLI to make your development workflow more efficient.

I hope this blog post has been helpful. If you have any questions about Bun, please feel free to leave a comment below

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