hapi file-upload and save to file

index.js

'use strict';

const Hapi = require('@hapi/hapi');
const util = require('util');
const fs = require("fs");

const readFile = util.promisify(fs.readFile);
const writeFile = util.promisify(fs.writeFile);

function bootstrap_db () {
    let db_hash_data = fs.readFileSync("db_hash.json");
    let db_hash = JSON.parse(db_hash_data);
    console.log("db_hash: ", db_hash);

    // consistency
    /*
    let files = fs.readdirSync("files");
    let diff = files.filter(file => !db_hash.map(x => x.path).includes(file))
    diff.map(path => ({"filename": path, "path": path}));
    db_hash.push(diff);
    fs.writeFileSync("db_hash.json", db_hash);
    */
    return db_hash;
}
let db_hash = bootstrap_db()
console.log("global db_hash", db_hash)

async function save (db_hash, data) {
    db_hash.push(data);
    let result = await writeFile("db_hash.json", JSON.stringify(db_hash));
    console.log("global2 db_hash", db_hash)
}

const init = async () => {

    const server = Hapi.server({
        port: 3001,
        host: 'localhost'
    });

    server.route({
        method: 'GET',
        path:'/',
        handler: (request, h) => {

            return h.file("index.html");
        }
    });

    server.route({
        method: 'POST',
        path:'/save_file',
        handler: (request, h) => {

	    let { filename, path } = request.payload["my-file"];
	    let path_arr = path.split("/");
	    path = path_arr[path_arr.length - 1];
	    save(db_hash, { filename, path });
            return { path, filename };
        },
	options: {
	    payload: {
		output: "file",
		uploads: "files",
		maxBytes: 15 * 1024 * 1024
	    }
	}
    });

    await server.register(require('@hapi/inert'));
    
    await server.start();
    console.log('Server running on %s', server.info.uri);
};

process.on('unhandledRejection', (err) => {

    console.log(err);
    process.exit(1);
});

init();