export indexedDB as a json

exportIndexedDB.js

((storeName) => {
let _result = {}
const _req = indexedDB.open(storeName)
_req.onsuccess = async () => {
	const db = _req.result
	let semaphore = 0
	for (num in [...db.objectStoreNames]) {
		semaphore++
		const tableName = db.objectStoreNames[num]
		db.transaction(tableName, 'readonly').objectStore(tableName).getAll().onsuccess = (e) => {
			_result[tableName] = e.target.result
			semaphore--
		}
	}
	
	while(semaphore > 0 ) {
		await new Promise(r => setTimeout(r, 10))
	}
	
	const url = "data:text/javascript;base64,"+btoa(JSON.stringify(_result, null, 2))
	
	const a = document.createElement('a')
	a.download=`${storeName}.bkp.json`
	a.href = url
	a.click()
};
})('PUT_DATABASE_NAME_HERE')