Frontend vs backend: the dining room and the kitchen

Lesson 6 of the journey of a tap: every part of your app lives on one side of a wall. Which side decides who can see it.

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Sam Ortega · Build Editor

You now understand

The frontend runs on the user's device, so everyone can read it

You now understand

The backend runs on computers you control

You now understand

Private things (rules, data, keys) belong in the backend

What this means for your app

Ask your AI tool to sort your app into two lists: what runs on the phone and what runs on a server. Anything private on the phone list is your first fix, and the security checklist covers the rest.

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Frontend vs backend: the dining room and the kitchen

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