module.js

const Redis = require("ioredis");
const redis = new Redis();

async function main() {
  // Redis#call() can be used to call arbitrary Redis commands.
  // The first parameter is the command name, the rest are arguments.
  await redis.call("JSON.SET", "doc", "$", '{"f1": {"a":1}, "f2":{"a":2}}');
  const json = await redis.call("JSON.GET", "doc", "$..f1");
  console.log(json); // [{"a":1}]
}

main();