[kartickv]

In this case, I wouldn't disagree with you if you were to do it on the backend.

The article says, "build a backend API when it has something to do, not as a pass through to your database."

It doesn't say "never write any backend code".

[jpatte]

The article's subtitle literally says "The best backend is no backend at all". The article gives the impression you have no idea what a backend is supposed to do, except expose some data.