This is post API

    router.post('/', async function(req, res, next) {
    const subscribersFile= path.join(__dirname, "../subscribers.json")
    const data = await fs.readFile(subscribersFile, "utf-8")
    let subscribers= JSON.parse(data)
    
    let subscriber = req.body
     
    const id = uuid.v4();
    subscriber= {...subscriber, id: id}

    subscribers = [...subscribers, subscriber]
    const json = JSON.stringify(subscribers)
    await fs.writeFile(subscribersFile, json, "utf-8")


    return res.json({data: "POST", body: req.body})
}
  });

this code works but review comments suggested to change it to dictionary

how to change subscribers = [...subscribers, subscriber] to dictionary.