Submit form with file react

form.jsx

import React, {useState} from "react"

export default function() {
  const [cont, setCont] = useState("")
  const [file, setFile] = useState(null)
  
  const handleSubmit = async (e) => {
    e.preventDefault()
    const formData = new FormData()
    formData.append("body", JSON.stringify(cont))
    formData.append("files.image", file)
    
    const resp = await fetch("localhost:3000", {
      method: "POST",
      body: formData
    })
    
    const data = await resp.json()
  }
  
  return(
    <form onSubmit={handleSubmit}>
      <input type="text" value={cont} onChange={e => setCont(e.target.value)}/>
      <input type="file" onChange={e => setCont(e.target.files[0])}/>
    </form>
  )
}