From JSON to TypeScript: Five Ways to Stop Hand-Writing Interfaces

You've done it. We all have. A new endpoint shows up. You curl it, get back eighty lines of nested JSON, and start typing: interface User { id : string name : string // wait, is `email` always present? } Twenty minutes later you've shipped it, ten minutes after that production is throwing Cannot read property 'name' of undefined because the API returns null for soft-deleted accounts, and you're patching it on the train home. Hand-writing TypeScript interfaces from JSON responses is one of those