Are you ready to dive into the world of modern web servers? If you have some experience with Express.js, you might find bunrest to be a refreshing alternative that maintains many of the same principles but with a unique twist. In this guide, we will explore how to set up and use bunrest, which is specifically designed for the Bun HTTP server. Let’s get started!

What is bunrest?

bunrest is an ExpressJs-like API designed for the Bun HTTP server. It is known for its lightning-fast performance, minimal dependencies, and a gentle learning curve if you’re already familiar with Express.js.

Key Features

• 🚀 BLAZING FAST: Built on the Bun server, it offers exceptional speed.
• 🌟 Zero dependencies: Works seamlessly with Bun.
• 📖 Easy to learn: If you know Express.js, transitioning to bunrest is effortless.

Table of Contents

• Set up
• Usage
• Router
• Middlewares
• Error Handling
• Request and Response Object
• Websocket

Get Started

To kick things off, follow these simple steps to set up bunrest:

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

Once bun is installed, you can create a new project by running:

bun init

This command will generate a blank bun project. You can refer to the official documentation for more details.

Usage

After setting up your server, it’s time to write your first HTTP methods just like you would in Express.js:

app.get('/test', (req, res) => res.status(200).json({ message: req.query }));
app.put('/test/:id', (req, res) => res.status(200).json({ message: req.params.id }));
app.post('/test/:id:name', (req, res) => res.status(200).json({ message: req.params }));

Router

Creating routes in bunrest is just as straightforward. Utilize the built-in router feature:

const router = app.router();
router.get('/test', (req, res) => res.status(200).json({ message: 'Router succeeded' }));
app.use('/your_route_path', router);

Middlewares

You can easily add middlewares to your application. Here are two methods:

1. Using `app.use()`:

   
       app.use((req, res, next) => {
         console.log('Middlewares called');
         next(); // call the next middleware
       });
       

2. Directly within request function parameters:

   
       app.get('/user', (req, res, next) => {
         // Middleware for user path
         res.status(200).send('Hello');
       });
       

Error Handling

Error handling in bunrest is similar to Express but postulates some nuances. Here’s how you can set up a global error handler:

app.use((req, res, next, err) => {
  console.error(err);
  res.status(500).send('Error happened');
});

Request and Response Object

bunrest provides tailored request and response objects that emulate those in Express.js. Below is how you would define them:

export interface BunRequest {
  method: string;
  path: string;
  // other properties
}
export interface BunResponse {
  status(code: number): BunResponse;
  json(body: any): void;
  // other methods
}

Websocket

To implement websocket connections using bunrest, you can utilize the following setup:

app.ws('/ws', (ws, msg) => {
  ws.send(msg);  // echo message back
});

To connect to your websocket server from the client side, use:

const socket = new WebSocket('ws://localhost:3000');
socket.addEventListener('message', (event) => console.log(event.data));

Troubleshooting

If you encounter hiccups during setup or usage, here are some common troubleshooting ideas:

• Server Not Starting: Ensure bun is properly installed. Reinstall if necessary.
• Middleware Not Triggering: Check the order of your middleware and routes.
• WebSocket Issues: Verify the WebSocket connection string and ensure the server is listening.
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Conclusion

bunrest offers a fantastic way to build APIs efficiently and effectively while leveraging the speed of Bun. By following this guide, you are well on your way to mastering bunrest for your next project.