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It looks like response is either null or doesn't have data property.

The route snippet is

const express = require('express');
const app = express();
const editBookRouter  = express.Router();

const Book=require('../models/book')


  editBookRouter.route('/edit/:id').get(function (req, res) {
    const book = new Book(req.body);
    const id = req.param.id;


    Book.findById(id)
    .then(Book => {
      console.log(book)  // prints the id
      res.json(book);
  })


    Book.findById(id, function (err, book){
    if(err){
      console.log(err);
    }
    else {
      res.json(book);
      console.log( book);  // prints null
    }
  });
});


  module.exports = editBookRouter;

After making the changes Now I'm able to get the object id but how to send the data from node to react.

There are many ways. You can change this function to a react class and set the state, you can also use react hooks within this function or you can install redux and react-redux and send what you need to the redux store.

Or simply pass the props to the child component

Thanks for the idea