example.js

const { Readable } = require("stream");

const buffer = await getWnft(args, { size: IMAGE_SIZE }); // returns Buffer
const fileData = Readable.from(buffer)
// we are calling the function below with `fileData: buffer`

static async uploadFileToIPFS({ fileData, metadata = {} }) {
  const pinataOptions = {
    cidVersion: PINATA_CID_VERSION,
    wrapWithDirectory: false,
  };

  const pinataMetadata = {
    keyvalues: metadata,
  };

  const data = new FormData();
  data.append("pinataOptions", JSON.stringify(pinataOptions));
  data.append("pinataMetadata", JSON.stringify(pinataMetadata));
  data.append("file", fileData, {
    filepath: "filename.png"
  });

  const config = {
    method: "post",
    url: `${this.BASE_URL}/${this.ENDPOINTS.PIN_FILE}`,
    headers: {
      Authorization: `Bearer ${PINATA_JWT}`,
      ...data.getHeaders(),
    },
    maxBodyLength: "Infinity",
    data,
  };

  try {
    const response = await axios(config);
    const responseData = response.data;
    const cid = responseData.IpfsHash;
    logger.info(`Successfully pinned file to IPFS, CID = ${cid}.`);
    return { success: true, cid };
  } catch (e) {
    logger.info(`Error pinning file to IPFS. Error ${e}`);
  }

  return { success: false, cid: null };
}

/*
{
  method: 'post',
  url: 'https://api.pinata.cloud/pinning/pinFileToIPFS',
  headers: {
    Authorization: 'Bearer <token>',
    'content-type': 'multipart/form-data; boundary=--------------------------767515994124970525600149'
  },
  maxBodyLength: 'Infinity',
  data: FormData {
    _overheadLength: 368,
    _valueLength: 97308,
    _valuesToMeasure: [],
    writable: false,
    readable: true,
    dataSize: 0,
    maxDataSize: 2097152,
    pauseStreams: true,
    _released: false,
    _streams: [
      '----------------------------767515994124970525600149\r\n' +
        'Content-Disposition: form-data; name="pinataOptions"\r\n' +
        '\r\n',
      '{"cidVersion":"1","wrapWithDirectory":false}',
      [Function: bound ],
      '----------------------------767515994124970525600149\r\n' +
        'Content-Disposition: form-data; name="pinataMetadata"\r\n' +
        '\r\n',
      '{"keyvalues":{}}',
      [Function: bound ],
      '----------------------------767515994124970525600149\r\n' +
        'Content-Disposition: form-data; name="file"\r\n' +
        'Content-Type: application/octet-stream\r\n' +
        '\r\n',
      <Buffer 89 50 4e 47 0d 0a 1a 0a 00 00 00 0d 49 48 44 52 00 00 08 00 00 00 08 00 08 06 00 00 00 b2 a7 d3 30 00 01 7b a7 49 44 41 54 78 9c ec dd 31 8c 9d d5 99 ... 97198 more bytes>,
      [Function: bound ]
    ],
    _currentStream: null,
    _insideLoop: false,
    _pendingNext: false,
    _boundary: '--------------------------767515994124970525600149'
  }
}
*/