Developer Documentation Japanese: API, SDK, 引数, 戻り値

Core examples: API, SDK, 引数, 戻り値, エンドポイント, リクエスト, レスポンス, 認証, サンプルコード, 非推奨.

Code snippets are not the whole documentation

Developer docs may show a code block, but the Japanese sentence above it says:

この引数は必須です。 認証にはアクセストークンが必要です。 このメソッドは非推奨です。

If you skip the prose, you may call the API incorrectly, use a deprecated method, forget authentication, or mishandle errors.

The key principle is:

Developer Japanese must be read by requirement, parameter, response, error, and version status.

Even when technical terms are English-looking, the grammar of obligation is Japanese.

API and SDK

API

Application Programming Interface.

SDK

Software Development Kit.

Japanese docs commonly use these acronyms directly.

Related:

APIリファレンス API reference

SDKをインストールする install the SDK

ライブラリ library

クライアント client

Learner action: acronyms are global, but the documentation flow is Japanese.

引数

引数

means argument/parameter.

Related:

パラメータ parameter

必須 required

任意 optional

型 type

デフォルト値 default value

A parameter table may contain:

名前 name

型 type

必須 required

説明 description

Learner action: required versus optional is the first thing to check.

戻り値

戻り値

means return value.

Related:

返り値 return value, alternative term

レスポンス response

成功時 on success

失敗時 on failure

nullを返す returns null

The return value may differ by success/error state.

Learner action: read response schema and error conditions together.

エンドポイント

エンドポイント

means endpoint.

Related:

URL URL

メソッド method

GET / POST / PUT / DELETE

パス path

API docs often define endpoint, method, authentication, request parameters, and response body.

Learner action: endpoint plus method defines the operation.

リクエスト and レスポンス

リクエスト

means request.

レスポンス

means response.

Related:

リクエストボディ request body

ヘッダー header

クエリパラメータ query parameter

ステータスコード status code

Japanese docs may mix katakana with English tokens and code. Read structure, not language purity.

認証

認証

means authentication.

Related:

APIキー API key

アクセストークン access token

OAuth OAuth

認証情報 credentials

Docs may specify where to include auth:

Authorizationヘッダーに指定してください。 Specify it in the Authorization header.

Learner action: authentication instructions often determine whether sample code works.

サンプルコード

サンプルコード

means sample code.

Related:

実装例 implementation example

コード例 code example

以下の例 following example

Sample code may not include all error handling, security, or production conditions.

Learner action: use sample code as demonstration, not complete system design.

エラー and error handling

Common terms:

エラーコード error code

エラーメッセージ error message

例外 exception

タイムアウト timeout

リトライ retry

レート制限 rate limit

Error sections tell how the API fails.

Learner action: implement error handling; do not read only success examples.

非推奨

非推奨

means deprecated/not recommended.

Related:

廃止予定 scheduled for discontinuation/removal

サポート終了 end of support

互換性 compatibility

移行 migration

A deprecated API may still work but should not be used for new development.

Learner action: if 非推奨 appears, look for replacement method and migration timeline.

Version and prerequisites

Docs often mention:

前提条件 prerequisites

対応バージョン supported version

動作環境 operating environment

インストール installation

設定 configuration

A code snippet may fail if environment assumptions are wrong.

Example bank walkthrough

API

Interface for programmatic access.

Learner action: operation reference.

SDK

Software development kit.

Learner action: library/tool package.

引数

Argument/parameter.

Learner action: required/optional/type.

戻り値

Return value.

Learner action: success/error output.

エンドポイント

Endpoint.

Learner action: URL/method operation.

リクエスト

Request.

Learner action: input sent to API.

レスポンス

Response.

Learner action: output returned.

認証

Authentication.

Learner action: access requirements.

サンプルコード

Sample code.

Learner action: example, not full production system.

非推奨

Deprecated.

Learner action: avoid for new work, find replacement.

Docs-reading pass

When reading Japanese developer docs:

1. Purpose: what does this API/SDK do?
2. Prerequisites.
3. Endpoint and method.
4. Authentication.
5. Required parameters.
6. Optional parameters.
7. Request format.
8. Response format/return value.
9. Error codes and retry rules.
10. Sample code.
11. Version/deprecation status.
12. Security notes.

Developer-doc component table

Developer documentation should be read as a structured reference.

A code sample is not enough. The prose around it often defines constraints.

Requirement force in docs

Watch for:

必須 required

任意 optional

指定してください specify/provide

省略可能 can be omitted

使用できません cannot be used

非推奨 deprecated/not recommended

These small words determine whether an implementation works.

Version and deprecation warning

Developer docs change. If you see 非推奨, 廃止予定, 旧バージョン, or 移行, the code may still work today but be a bad choice for new development.

A good docs-reading pass includes version, release date, and replacement API.

A strong tool for this article would convert docs into implementation checklists.

Suggested functions:

1. Parameter table reader.
2. Required/optional highlighter.
3. Endpoint/method detector.
4. Auth instruction extractor.
5. Response schema summarizer.
6. Error code glossary.
7. Deprecated API warning.

Final rule

Developer documentation Japanese is not difficult because of katakana. It is difficult because requirements hide in short sentences.

API and SDK name the tool. 引数 and 戻り値 define the call. エンドポイント, リクエスト, レスポンス, and 認証 define the flow. サンプルコード demonstrates. 非推奨 warns.

Read the prose around the code.