The hardest question for a first app is often "so… what should I build?" Public data APIs are great raw material here. Weather, transit, and public facilities connect your app to real life.

Real data makes features concrete

Say your idea is "an app showing public parking lots near me." The features write themselves:

  • Pick a location or region
  • Fetch the parking list from the API
  • Show only the fields people need
  • Handle errors and empty results

A vague app idea turns into a concrete task list.

AI helps you read API docs too

Public data API docs look intimidating at first, with unfamiliar fields and auth schemes. Show part of the docs to an AI and ask which parameters a request needs.

Still, AI can guess URLs and field names wrong. Always confirm against the official docs.

Flutter builds app screens from one project

Flutter is a widely used cross-platform framework for mobile apps. AI can draft screen code and data models for you, but as the project grows you will also need basics like file structure and state management.

At first, connect one screen to one API. That's plenty.

Vibe coding still needs requirements

"Build me an app" loses to specifics every time. "When the user picks a region, show parking names and addresses, and show a notice when the API fails" tells the AI what done looks like.

The faster AI writes code, the more your ability to say exactly what to build matters.

Aim for a small shippable feature, not a finished product

Your first app doesn't need many features. Loading real data onto a screen already teaches you APIs, async work, UI, and error handling in one go.

A public data project is a great starting point: it takes you past "AI writes code for me" all the way to shipping an idea onto a real user screen.

The bottom line

Long deliberation freezes your hands. Pick one checkable dataset — nearby parking, weather, libraries — and put it on screen. That one small win teaches APIs, screens, and error handling together.

Go deeper with a course

If you want to turn a public data idea into a working app without stalling halfway, a guided course keeps the scope shippable.