read-json.js

const fs = require('fs').promises;
const path = require('path');

async function main() {
    const cache = {};
    await readdir('.', cache);
    console.log(JSON.stringify(cache));
}

async function readdir(dir, cache) {
    dir = path.resolve(dir);
    const dirents = await fs.readdir(dir, {
        withFileTypes: true,
    });
    for (const dirent of dirents) {
        if (dirent.isDirectory()) {
            await readdir(path.join(dir, dirent.name), cache[dirent.name] = {});
        } else if (dirent.isFile()) {
            await read(path.join(dir, dirent.name), cache);
        }
    }
}

async function read(filePath, cache) {
    const fileExt = path.extname(filePath);
    if (fileExt.toLowerCase() !== '.json') {
        return;
    }
    const basename = path.basename(filePath, fileExt);
    cache[basename] = require(filePath);
}

main();