ZeroServer.tools

JSON to TypeScript

Generate TypeScript interfaces from any JSON — handles arrays, nulls, and optional keys.

Root type nameAdd export

JSON Input

Drop a JSON file or click to browseLoads it into the input below

TypeScript Output

interface RootItem {
  name: string;
  age: number | null;
  email?: string;
  scores: number[];
  address: Address;
  active?: boolean;
}

interface Address {
  city: string;
  zip: string;
}

type Root = RootItem[];

JSON to TypeScript interface generation

TypeScript interfaces provide compile-time type safety for JSON data structures. This tool recursively inspects your JSON — detecting strings, numbers, booleans, nulls, arrays, and nested objects — and emits a matching set of interfacedeclarations. Nested objects become their own named interfaces (capitalized from their key name), and arrays get a corresponding item type. The generator handles keys that aren't valid identifiers by wrapping them in quotes. Everything runs locally in your browser; no data is sent anywhere.

Related tools: JSON to Go Struct · JSON Formatter · JSON Schema Generator

Private & free — this tool runs entirely in your browser.