型ツール

JSON から TypeScript インターフェース生成

Paste JSON and generate TypeScript interfaces locally for API responses, fixtures, and typed frontends.

Interface generator

Infer TypeScript from representative JSON.

export interface Tool {
  id: string;
  title: string;
  status: string;
  tags: Array<string>;
  metrics: Metrics;
  owner?: null;
}

export interface Metrics {
  users: number;
  conversion: number;
}

主な機能

JSON Input

Paste representative JSON payloads from APIs, logs, or fixtures.

Interface Output

Generate exportable TypeScript interfaces with nested object support.

Array Inference

Infers array item types and merges mixed primitive values into unions.

Safe Keys

Quotes property names that are not valid TypeScript identifiers.

Copy Ready

Move generated types straight into your editor.

Browser-only

Your API payload stays in the browser.

よくある質問

No. It is a quick interface inference tool for representative payloads. For strict contracts, pair it with JSON Schema or runtime validators.

Null properties are marked optional and typed as null in this first version.

No. Type generation runs locally.