method URL.createObjectURL

Creates a 'blob:nodedata:...' URL string that represents the given Blob object and can be used to retrieve the Blob later.

import {
  Blob,
  resolveObjectURL,
} from 'node:buffer';

const blob = new Blob(['hello']);
const id = URL.createObjectURL(blob);

// later...

const otherBlob = resolveObjectURL(id);
console.log(otherBlob.size);

The data stored by the registered Blob will be retained in memory until URL.revokeObjectURL() is called to remove it.

Blob objects are registered within the current thread. If using Worker Threads, Blob objects registered within one Worker will not be available to other workers or the main thread.