JSON to TypeScript Interface Generator

Generate TypeScript interfaces or types from a JSON sample

🔒 100% ブラウザ内🆓 ずっと無料⚡ サインアップ不要
注意: 下記のツールインターフェースは現時点で英語のみに対応しています。UI の翻訳は順次進めています。 このツールを英語で見る →

使い方

  1. 1
    Paste JSON

    Drop a sample response, config, or object literal.

  2. 2
    Name the root type

    Set the top-level type name (defaults to 'Root').

  3. 3
    Copy the TypeScript

    Get an interface (or type alias) definition for every nested object.

JSON to TypeScript Interface Generator について

Free online JSON to TypeScript converter. Paste a JSON sample to generate clean TypeScript interfaces or type aliases, with automatic nested-type extraction and array union inference. Runs entirely in your browser. 712 Tools の JSON to TypeScript Interface Generator はモダンな JavaScript API を使って完全にブラウザ内で動作します - サーバーがあなたのデータを見ることは一切ありません。つまり、即時の結果、完全なプライバシー、アップロード制限なしです。

デバッグ、簡単な確認、あるいは本番のインシデント対応まで - このツールは何度でも無料で使えます。ウォーターマークなし、サインアップなし、ツール内広告なし。

よくある質問

How are arrays typed?

Element types are inferred and merged: a mixed [1, 'a'] becomes Array<number | string>.

Interface vs type?

Interfaces are extensible via declaration merging; types are more flexible with unions and mapped types. Toggle in the UI to switch.

What about optional fields?

Only the fields present in your sample are emitted. Merge multiple samples with a union type if some fields are conditionally present.

続きを読む

5 分で読了

JSON Schema for LLM structured output: the developer's shortcut

OpenAI's structured output and Anthropic's tool use both want JSON Schema. Here's the draft that works everywhere, the fields models care about, and how to write one from an example in 10 seconds.

5 分で読了

JSON to TypeScript: workflows that scale beyond a single sample

A one-shot JSON → interface tool is great for demos and dead for production. Here are the patterns real teams use to keep types in sync with real APIs.

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