Pass a connected NATS client, then pass the adapter to Paul Revere. NATS client must be configured to use JSON.
const PaulRevere = require('paul-revere'),
PRNats = require('paul-revere-nats-adapter'),
nats = require('nats');
const natsClient = nats.connect({json: true});
const paul = new PaulRevere(<your-schemas>, <your-server>, new PRNats(natsClient));