TypeScript JSON Typing: Interfaces, Generics, and Validation
Type-safe JSON handling in TypeScript: interfaces, generics, Zod validation, and JSON.stringify with custom replacers for typed objects.
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Tags: json, typescript, developer-tools
TypeScript JSON Typing: Interfaces, Generics, and Validation TypeScript's type system doesn't extend to runtime — returns , and whatever the type annotation says, the actual shape of the data is determined by what you receive, not what you declare. This gap between compile-time types and runtime reality is where JSON handling in TypeScript gets interesting. Typing JSON.parse with Generics The naive approach is to cast the parse result directly: A safer pattern wraps in a generic function that makes the type assertion explicit and signals to reviewers that a runtime check is needed: But this still doesn't validate the data at runtime. For truly safe parsing, you need either a type guard or a validation library. Interface vs Type for JSON Shapes Both and work for describing JSON shapes, but…
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