test.js

const axios = require('axios');
const qs = require('qs');
const uniqid = require('uniqid');

const data = {"assets": [
  {"url": "https://via.placeholder.com/150", "name": "test.png"},
  {"url": "https://via.placeholder.com/151", "name": "test.png"},
  {"url": "https://via.placeholder.com/152", "name": "test.png"},
  {"url": "https://via.placeholder.com/153", "name": "test.png"},
  {"url": "https://via.placeholder.com/154", "name": "test.png"},
  {"url": "https://via.placeholder.com/155", "name": "test.png"},
  {"url": "https://via.placeholder.com/156", "name": "test.png"},
  {"url": "https://via.placeholder.com/157", "name": "test.png"},
  {"url": "https://via.placeholder.com/158", "name": "test.png"}
]};

const run = async () => {
 
  const failed = {};

  for (const asset of data.assets) {
    try {
    console.log(asset.url);
    
    const uniqueIdentifier = uniqid(); //Create Unique ID
      
    const queryparams = qs.stringify({
      key: "KEY",
      url: asset.url,
      path: `PROJECTID-STAGE/${uniqueIdentifier}_${asset.name}`
    })
    await axios.post(`https://www.filestackapi.com/api/store/S3?${queryparams}`)
    .then(function (response) {
      console.log(response.data);
    })
    .catch(function (error) {
      console.log(error);
    });
    } catch(e) {
      failed[asset.url] = e;
    }
  }
  
  console.log(JSON.stringify(failed, null, 2));
  
}

run().then(() => console.log('Ready')).catch(console.error);