Node-RED embedded (standalone)

nr.js

var RED = require("node-red");
var importedFlows = require('./flows.json')
const path = require('path');

// Create the settings object - see default settings.js file for other options
var settings = {
  httpNodeRoot: false,
  httpAdminRoot: false,
  userDir: path.join(__dirname, ".nodered"),
  functionGlobalContext: {}
};

const init = async () => {
  // Initialise the runtime with a server and settings
  RED.init(null, settings);

  await RED.start();

  let foo = await RED.runtime.flows.setFlows(
    {
      flows: { flows: importedFlows },
      deploymentType: 'flows'
    }
  )

  console.log(await RED.runtime.flows.getFlows())
}

init()