City autocomplete sounds simple until you realize you need to search across 150,000 cities from 250 countries — with fast response times and no UI jank. Here's how to do it right. The Challenge You can't load 150K cities into the browser — that's tens of megabytes. You need server-side search that returns relevant results as the user types. ApogeoAPI's global search endpoint handles this. The API Approach Use the global search endpoint for cross-country city search: GET /v1/search?q=lon&limit=5 // Returns cities, states, and countries matching "lon" // Results: London GB, Long Beach US, Longueuil CA, ...…