How to transfer files to fetch server

Question

I am sending the following post request to the server

async function onPressLogin (state) {
  const data = {username:state.email,password:state.password}
  console.log('data at Json: ',JSON.stringify(data))
  try {
    let response = await fetch("http://localhost:5000/api/login",{
      mode: "no-cors",
      method:"POST",
      body:JSON.stringify(data),
      headers:{
        "Content-Type": "application/json",
      }
    })
    let result = await response.json()
    console.log('Result: ',result)
  } catch (e) {
    console.log('Catch:',e.message)      
  }
}

But on the server request.body is {} What can be the issue here?