create-hypercore.js

// npm i hypercore@10.0.0-alpha.24 hyperswarm@3.0.1
// Run `node create-hypercore.js` and pass the resulting key to https://gist.github.com/Nazeh/721368b93729dcfa00049c9de230f2ad
const Hypercore = require('hypercore');
const Hyperswarm = require('hyperswarm');

const createCore = async () => {
  const core = new Hypercore('origin', { valueEncoding: 'json' });
  await core.ready();

  // Add blocks here if you want.
  const blocks = [{ foo: 0 }, { foo: 0, bar: 1 }];
  await core.append(blocks);

  const swarm = new Hyperswarm();
  swarm.on('connection', (conn, info) => {
    console.log('connected to peer', info);

    core.replicate(conn);
  });

  const discovery = swarm.join(core.discoveryKey, {
    server: true,
    client: false,
  });

  await discovery.flushed();

  console.log('Created core: ', core.key.toString('hex'));

  process.once('SIGINT', () => {
    swarm.destroy();
  });
};

createCore();