How to convert a JSON into a Hashmap in NodeJS - node.js

Question

I am attempting to convert a HTTP request body in JSON format into a hashmap. Below is how my request looks:
{
"car": [{
"ford": "focus",
"audi": "a6"
}],
"food": [{
"soup": "leek"
}]
}
And below is the code I have tried so far:
const express = require('express');
const router = express.Router();
router.post('/items', async (req, res) => {
res.setHeader('Content-Type', 'application/json');
let jsonString = JSON.stringify(req.body);
let jsonObject = JSON.parse(jsonString);
let jsonMap = new Map(Object.entries(jsonObject));
var mainArray = {};
var carKey = 'car';
mainArray[carKey] = [];
for (var entry of jsonMap.entries()) {
let key = entry[0], value = entry[1];
let innerJson = JSON.stringify(value);
let innerJsonObj = JSON.parse(innerJson);
for(var innerKey in innerJsonObj) {
let tempStr = JSON.stringify(innerJsonObj[innerKey]);
let tempVal = JSON.parse(tempStr);
let attr = '';
let param = '';
for(var k in tempVal) {
attr = k;
param = tempVal[k];
logger.info(k + "=" + tempVal[k]);
}
let result = someMethod(param);
var carData = {
attr : JSON.stringify(result);
}
mainArray[carKey].push(carData);
}
}
});
I want to display the results in the same way as received in the request, but with the use of the binary result of someMethod(). Below is what im trying to create as a response.
{
"car": [
{
"ford": "binarydata",
"audi": "binarydata"
}
],
"food": [
{
"soup": "binarydata"
}
]
}

Answer 1

I have managed to achieve this using the code below. This allows me to specify the key and value in the JSON I add to the array via the push() command. Thank you for the guidance.
var carData = {};
carData[attr] = JSON.parse(JSON.stringify(`${result}`));
mainArray[carKey].push(carData);