Translation guide
API is a technical term that is used as-is in Japanese. It is almost always written in uppercase Latin letters and pronounced as an initialism.
Referring to a set of protocols and tools for building software applications, especially web services.
The standard term in Japanese technical contexts. Pronounced as the English initialism.
このAPIを使うと、天気情報を取得できます。
Using this API, you can get weather information.
APIキーを取得してください。
Please obtain an API key.
Used when specifically referring to web-based APIs. Common in web development contexts.
Web APIの設計について議論しましょう。
Let's discuss the design of the Web API.
The full Japanese expansion of the acronym. Rarely used in practice; mostly found in formal documentation or educational materials.
アプリケーションプログラミングインターフェース（API）は、ソフトウェア同士のやり取りを可能にします。
An Application Programming Interface (API) enables communication between software.
In Japanese technical writing and conversation, 'API' is used exactly as in English. It is not translated. When speaking, pronounce it as 'ē-pī-ai' (エーピーアイ). It is often combined with katakana loanwords like 'キー' (key) or 'エンドポイント' (endpoint).