Can Bunjs be used as a backend server? - bun

Question

Now we can start a react App with bun as a server
Can we use Bunjs as complete backend server?
For Example, Can bun run this code?
const express = require('express')
const app = express()
app.get('/', (req, res) => {
res.send('hello world')
})
app.listen(3000)

Answer 1

I guess Bun does not YET implement all node.js api's. I tried http and it seems currently missing. And as much I understand it currently has its own built-in HTTP server.
Check the "Getting started" section on -> https://bun.sh/
A sample server:
export default {
port: 3000,
fetch(request) {
return new Response("Welcome to Bun!");
},
};
(This example reminds me of serverless functions.)
As this is the case, it seems you can not rely on Node.js http, or most probably any server framework like express.
At least for now, bun's roadmap (https://github.com/oven-sh/bun/issues/159) shows a line, which I am not sure is talking about node's http server or sth. else about Bun's own server.
Once complete, the next step is integration with the HTTP server and
other Bun APIs

Answer 2

Bun api is really different from nodejs, I created a library called bunrest, a express like api, so new user does not need to learn much about bun.
Here is how to use it
Install the package from npm
npm i bunrest
To create a server
const App = require('bunrest');
const server = new App.BunServer();
After that, you can call it like on express
server.get('/test', (req, res) => {
res.status(200).json({ message: 'succeed' });
});
server.put('/test', (req, res) => {
res.status(200).json({ message: 'succeed' });
});
server.post('/test', (req, res) => {
res.status(200).json({ message: 'succeed' });
});
To start the server
server.listen(3000, () => {
console.log('App is listening on port 3000');
});

Answer 3

Other way is using Hono: https://honojs.dev/
There is a working demo: https://github.com/cachac/bun-api
Import package and set new instance
import { Hono } from 'hono'
const app = new Hono()
Create routes:
Instead of NodeJs res.send(), use c.json({})
app.get('/hello', c => c.json({ message: 'Hello World' }))
export and run api server:
export default {
fetch: app.fetch,
port: 3000
}