Handle form data (file) in Nuxt3 h3 server

server_api_form.ts

import {File} from 'fetch-blob/file.js'
import {Blob} from 'buffer'
import {default: Busboy} from 'busboy'


async function readForm(req) {
  // My implementation is similar to 
  // https://github.com/cloudflare/miniflare/blob/master/packages/core/src/standards/http.ts#L302
  const data = {}
  await new Promise( (resolve) => {
    const bb = Busboy({ headers: req.headers })
    bb.on('field', (key, value) => {
      data[key] = value
    })
    bb.on('file', (key, file, info) => {
      const buffer_array = []
      file.on('data', (data) => {
        buffer_array.push(Buffer.from(data, {'type': info.mimeType}))
      }).on('close', () => {
        data[key] = new File(buffer_array, info.filename, {'type': info.mimeType})
      })
    })
    bb.on('close', resolve)
    req.pipe(bb)
  })
  return data
}


export default defineEventHandler( async (event) => {
  if (event.req.method == "POST") {
    let data = await readForm(event.req)
    console.log(data)
    // do-something
  }
}