How to send user id?

Question

MongoDB

I set up a chat for the site, created a model for mongo and a function for sending data, but for some reason the user id does not come, although a chat room with its id is created.
Model

const mongoose = require("mongoose");

const ConversationSchema = new mongoose.Schema(
  {
    members: {
      type: Array,
    },
  },
  { timestamps: true }
);

module.exports = mongoose.model("Conversation", ConversationSchema);

create function

router.post("/", async (req, res) => {
  const newConversation = new Conversation({ /* использует модель  Conversation*/
    members: [req.body.senderId, req.body.receiverId], /*уч. беседы:тело запроса[id.sende,id.rece]  */
  });

  try {
    const savedConversation = await newConversation.save();
    res.status(200).json(savedConversation);
  } catch (err) {
    res.status(500).json(err);
  }
});

there are users with the specified id in the database

Answer 1

Judging by the fact that in the response there are two values ​​in the members field (both null), I can assume that something is still wrong with getting values ​​from body.
Output req.body.senderId, req.body.receiverId and req.body itself to the console
On the screen, it seems that something is wrong with quotes...