A step-by-step guide to writing an Express-like API with Bun.js

Bun.js is a new JavaScript runtime designed to be fast and efficient. It can build various applications, including web servers, APIs, and CLI tools.

Express.js is a popular Node.js framework for building web applications and APIs. It provides a simple, elegant way to define routes, handle requests, and render responses.

This article will show you how to write Express-like APIs with Bun.js.

Getting started

To get started, you must install Bun.js and the Bunrest package. Bun.js can be installed using the following command(Linux or Windows subsystem Linux required):

curl -fsSL https://bun.sh/install | bash

The bunrest package can be installed using the following command:

npm i bunrest

Creating a server

We can use the App class from the bunrest package to create a server. The following code shows how to create a simple server:

import App from 'bunrest'

const app = App();

Adding middlewares

Middleware is a function that can be used to pre-process or post-process requests. Express.js provides built-in middleware, such as logging, authentication, and compression.

We can use the use() method to add middleware to our server. The following code shows how to add a middleware that logs all requests:

app.use((req, res, next) => {
  console.log('Request Log:', req.method, req.path);
  next();
});

Adding a router

The router is responsible for matching requests to routes and handling them accordingly. Bunrest provides a simple router that can be used to define routes and handlers.

The following code shows how to define a route that handles GET requests to the / path:

app.get('/', (req, res) => {
  res.send('I am Bun!');
});

Starting the server

To start the server, we can use the listen() method. The following code shows how to create the server on port 3000:

app.listen(3000, () => {
  console.log('App is runing on port 3000');
});

Conclusion

In this article, we have shown you how to write Express-like APIs with Bun.js. Bunrest is a simple and easy-to-use package that can be used to create powerful and efficient APIs.

Bunrest is a powerful and efficient tool for building Express-like APIs with Bun.js. It is easy to use and provides several features, making it an excellent choice for all developers.