wait for body / streamToString

streamToString.js

// short version I prefer
const wait = (stream, parts=[])=> new Promise((resolve, reject)=>
  stream.on('error', reject).on('data', part => parts.push(part))
    .on('end', ()=> resolve(Buffer.concat(parts).toString('utf8'))))

// usage example
wait(req).then(body => console.log(body))

// original by Marlon Bernardes
function streamToString (stream) {
  const chunks = []
  return new Promise((resolve, reject) => {
    stream.on('data', chunk => chunks.push(chunk))
    stream.on('error', reject)
    stream.on('end', () => resolve(Buffer.concat(chunks).toString('utf8')))
  })
}

// his usage example
const result = await streamToString(stream)