how to convert x-www-form-urlencoded payload to json

i am using the npm request module to post data. by default the posy is of x-www-form-urlencoded so on the server side i am receiving the data like this

{
  'files[0][path]': 'myfile1',
  'files[0][contents]': 'some content',
  'files[0][active]': 'true'
}

how do i parse the data to json? like

{
  files: [{
    path: 'mypath',
    content: 'mycontent',
    active: true
  } {
    path: 'mypath2',
    content: 'mycontent2',
    active: false
  }]
}

I think express js might use a middle wire for this, but I am using hapi server. what are my options to parse the payload to json?