MongoDB backup and restore to local fs, designed to work on mongosh or mongodb compass shell

MongoBackup.js

var bk=new (function(){
	//use <database> first
	const fs = require("fs");	
	const os = require("os")
	const home=`${os.homedir()}/mongo-backup`;
	function backupTo(path){
		if (!path)
			throw new Error("use bk.backup('directory')");
		if (!fs.existsSync(path)) 
			fs.mkdirSync(path);
		db.getCollectionNames().forEach(cn=>{
			let col=[];
			let filename=`${home}/${path}/${cn}.json`;
			db[cn].find().forEach(doc=>col.push(doc));
			fs.writeFileSync(filename,JSON.stringify(col)+"\n");
			print(`Ok: ${filename}`);
		});
	}
	
	function restoreFrom(path){
		if (!path)
			throw new Error("use bk.restore('directory')");
		if (!fs.existsSync(path))
			return;
		nukeDB();
		ffs.readdirSync(`${home}/${path}`).forEach(f=>{
			if (f.endsWith(".json")){
				var fname=f.substring(0,f.length-5);
				var json=fs.readFileSync(`${home}/${path}/${f}`,"utf-8");
				json=JSON.parse(json);
				db[fname].insertMany(json);
			}
		});
	}
	
	function nukeDB(){
		db.getCollectionNames().forEach(cn=>{
			db[cn].drop();
		});
	}
	
	this.backup=backupTo;
	this.restore=restoreFrom;
	this.nuke=nukeDB;
})();