diff two json files

diff-json.js

import fs from "fs";

function deepSort(obj) {
  if (Array.isArray(obj)) {
    return obj.map(deepSort).sort((a, b) => JSON.stringify(a) > JSON.stringify(b));
  } else if (typeof obj === "object" && obj !== null) {
    return Object.keys(obj)
      .sort()
      .reduce((result, key) => {
        result[key] = deepSort(obj[key]);
        return result;
      }, {});
  } else {
    return obj;
  }
}

function jsonDiff(json1, json2) {
  let diff = {};

  json1 = deepSort(json1);
  json2 = deepSort(json2);

  for (let key in json1) {
    if (!(key in json2)) {
      diff[key] = json1[key];
    } else if (typeof json1[key] === "object" && typeof json2[key] === "object") {
      let objDiff = jsonDiff(json1[key], json2[key]);
      if (Object.keys(objDiff).length > 0) {
        diff[key] = objDiff;
      }
    } else if (json1[key] !== json2[key]) {
      diff[key] = json1[key];
    }
  }

  for (let key in json2) {
    if (!(key in json1)) {
      diff[key] = json2[key];
    }
  }

  return diff;
}

const json1 = JSON.parse(fs.readFileSync("./file1.json"));
const json2 = JSON.parse(fs.readFileSync("./file2.json"));

console.log(jsonDiff(json1, json2));