Shows the difference (in keys) between 2 json files

diff.js

// node diff.js f1.json f2.json

const _ = require('lodash');
const path = require('path');

if (process.argv.length != 4) {
  throw new Error('node script.js file1.json file2.json');
}

const f1 = process.argv[2];
const j1 = require(path.resolve(f1));  // eslint-disable-line
const f2 = process.argv[3];
const j2 = require(path.resolve(f2));  // eslint-disable-line


const diff1 = _.difference(_.keys(j1), _.keys(j2));
const diff2 = _.difference(_.keys(j2), _.keys(j1));

const obj1 = _.chain(diff1).map(k => [k, j1[k]]).fromPairs().value();
const obj2 = _.chain(diff2).map(k => [k, j2[k]]).fromPairs().value();

console.log('▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾'); // eslint-disable-next-line
console.log(`Keys only in ${f1}: ${_.join(diff1, ', ')}`);  // eslint-disable-next-line
console.log(JSON.stringify(obj1, null, 4));  // eslint-disable-next-line
console.log('▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾▾');  // eslint-disable-next-line
console.log(`Keys only in ${f2}: ${_.join(diff2, ', ')}`);  // eslint-disable-next-line
console.log(JSON.stringify(obj2, null, 4));  // eslint-disable-next-line