FND.10.05 BeginnerCore — asked often

fetch and JSON APIs

Comes up in: Recruiter screen, UI coding, Machine coding

This concept is being written. It gets the full five steps — explanation, predict, interview angle, practice with tests, and review cards. Here is exactly what it will cover, so you can study it elsewhere in the meantime.

What it covers

fetch(url)
response.ok and status (fetch does not reject on 404)
response.json()
loading/error/empty states
query strings
a public API with CORS enabled

Words you will know

APIendpointfetchJSONloading state

What you will practise

weather or quotes app with loading and error states

Interview questions this answers

Does fetch reject on a 404 response? How do you handle errors correctly?