Main.js for something...

main.js

const fs = require('fs');
const dir = fs.opendirSync('json')
let dirent
let db_out = [];
while ((dirent = dir.readSync()) !== null) {
  let json = JSON.parse(fs.readFileSync(`json/${dirent.name}`));
  json.forEach((f) => {
    let ts = new Date(f.ts * 1000);
    // Get attachment title
    if (f.attachments == undefined){
        
    }else {
        f.attachments.forEach((e) => {
            db_out.push({
                title: e.title,
                run_date: `${ts.getMonth()}/${ts.getDay()}/${ts.getFullYear()}`
            }) 
        });
    }
  });
}
let occur = {};
db_out.forEach((g) => {
    if (occur[g.title] == undefined){
        occur[g.title] = {};
    }
    if (occur[g.title][g.run_date] == undefined){
        occur[g.title][g.run_date] = 1;
    }else {
        occur[g.title][g.run_date] += 1;
    }
});
fs.writeFileSync("out.json", JSON.stringify(occur));
dir.closeSync()