TypeScript Discriminated Unions: Safe API Response Handling

TypeScript Discriminated Unions: Safely Handling Dynamic API Responses In the real world, API responses aren't always uniform. Sometimes, a single endpoint might return data in wildly different shapes depending on a status field, or an error might contain different details than a successful payload. This heterogeneity can quickly lead to runtime errors if not handled carefully. TypeScript's discriminated unions, combined with type guards, provide an elegant and robust solution to this common challenge, ensuring type safety even when dealing with dynamic data. This article dives into how to define and use discriminated unions to confidently process API responses that vary in structure. We'll move beyond high-level concepts and explore practical code examples, demonstrating how to leverage TypeScript's type narrowing capabilities for more reliable applications. Understanding Discriminated Unions At its core, a discriminated union is a type that consists of several other types (a union),