const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    materials: [
      {
        name: 'Chapter 1',
        filename: 'document.pdf',
        contentType: 'application/pdf',
        folderId: '<string>'
      }
    ]
  })
};

fetch('https://studyfetchapi.com/api/v1/materials/batch', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

[
  {
    "name": "<string>",
    "uploadUrl": "<string>",
    "s3Key": "<string>",
    "materialId": "<string>"
  }
]