Translate to Japanese (日本語).

Language code: ja.

### Grammar and tone

1) Use polite, instructional Japanese (です/ます調).
2) Keep the tone concise and technical (match existing Japanese FastAPI docs).

### Headings

1) Follow the existing Japanese style: short, descriptive headings (often noun phrases), e.g. 「チェック」.
2) Do not add a trailing period at the end of headings.

### Quotes

**Test Count**: 10 tests

**Key Scenarios**:
- ✅ Valid filename extraction
- ✅ Null parameters handling
- ✅ Empty/missing resource name
- ✅ Special characters in filename (Japanese, paths)
- ✅ Input stream not consumed (only validated)
- ✅ Whitespace and empty string handling

---

### 3. ArchiveExtractorErrorHandlingTest.java
**Purpose**: Test improved error handling in archive extractors.

Damos la bienvenida a pull requests para tu idioma.

### Traducciones

- [English](../../README.md)
- [日本語 (Japanese)](../ja/README.md)
- [简体中文 (Simplified Chinese)](../zh-CN/README.md)
- [Português (Brazilian Portuguese)](../pt-BR/README.md)
- [Français (French)](../fr/README.md)
- [Deutsch (German)](../de/README.md)

* 🌐 Add Japanese translation for `docs/ja/docs/tutorial/dependencies/sub-dependencies.md`. PR [#1959](https://github.com/tiangolo/fastapi/pull/1959) by [@SwftAlpc](https://github.com/SwftAlpc).
* 🌐 Add Japanese translation for `docs/ja/docs/tutorial/background-tasks.md`. PR [#2668](https://github.com/tiangolo/fastapi/pull/2668) by [@tokusumi](https://github.com/tokusumi).

We welcome pull requests for your language.

### Translations

- [日本語 (Japanese)](docs/ja/README.md)
- [简体中文 (Simplified Chinese)](docs/zh-CN/README.md)
- [Español (Spanish)](docs/es/README.md)
- [Português (Brazilian Portuguese)](docs/pt-BR/README.md)
- [Français (French)](docs/fr/README.md)

Nous accueillons les pull requests pour votre langue.

### Traductions

- [English](../../README.md)
- [日本語 (Japanese)](../ja/README.md)
- [简体中文 (Simplified Chinese)](../zh-CN/README.md)
- [Español (Spanish)](../es/README.md)
- [Português (Brazilian Portuguese)](../pt-BR/README.md)
- [Deutsch (German)](../de/README.md)

Aceitamos pull requests para o seu idioma.

### Traduções

- [English](../../README.md)
- [日本語 (Japanese)](../ja/README.md)
- [简体中文 (Simplified Chinese)](../zh-CN/README.md)
- [Español (Spanish)](../es/README.md)
- [Français (French)](../fr/README.md)
- [Deutsch (German)](../de/README.md)
- [한국어 (Korean)](../ko/README.md)

2. **Search/Analysis Support** (40+ languages): Language-specific text analysis for search indexing

Currently supported UI languages: German, English, Spanish, French, Italian, Japanese, Korean, Dutch, Polish, Brazilian Portuguese, Russian, Simplified Chinese, and Traditional Chinese.

## File Structure

Language resource files are located in:
```
src/main/resources/

Wir begrüßen Pull-Requests für Ihre Sprache.

### Übersetzungen

- [English](../../README.md)
- [日本語 (Japanese)](../ja/README.md)
- [简体中文 (Simplified Chinese)](../zh-CN/README.md)
- [Español (Spanish)](../es/README.md)
- [Português (Brazilian Portuguese)](../pt-BR/README.md)
- [Français (French)](../fr/README.md)

我们欢迎您的语言的 Pull Request。

### 翻译

- [English](../../README.md)
- [日本語 (Japanese)](../ja/README.md)
- [Español (Spanish)](../es/README.md)
- [Português (Brazilian Portuguese)](../pt-BR/README.md)
- [Français (French)](../fr/README.md)
- [Deutsch (German)](../de/README.md)