Like someone else said, localStorage can be a good solution, but it will only exist in that browser on that computer, so if you switch from Chrome to Firefox, or get on a different computer you will not have access to it. As long as that's a limitation you can live with, it's a great tool!
Another alternative as someone else mentioned is using a cloud provided DB. You can even use AWS Lambda along with one of AWS' many DB solutions to get a super simple DB store up quickly.
I hope that can help you a bit, otherwise yes, a quick and super simple backend in Java or another language would be the way to go.
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Like someone else said, localStorage can be a good solution, but it will only exist in that browser on that computer, so if you switch from Chrome to Firefox, or get on a different computer you will not have access to it. As long as that's a limitation you can live with, it's a great tool!
Another alternative as someone else mentioned is using a cloud provided DB. You can even use AWS Lambda along with one of AWS' many DB solutions to get a super simple DB store up quickly.
I hope that can help you a bit, otherwise yes, a quick and super simple backend in Java or another language would be the way to go.