FastAPI converts the configurations to **JSON** to make them compatible with JavaScript, as that's what Swagger UI needs.

## Disable Syntax Highlighting { #disable-syntax-highlighting }

For example, you could disable syntax highlighting in Swagger UI.

Without changing the settings, syntax highlighting is enabled by default:

<img src="/img/tutorial/extending-openapi/image02.png">

`swagger_ui_parameters` 接受一個 dict，內容會直接傳給 Swagger UI 作為設定。

FastAPI 會把這些設定轉換成 **JSON**，以便與 JavaScript 相容，因為 Swagger UI 需要的是這種格式。

## 停用語法醒目提示 { #disable-syntax-highlighting }

例如，你可以在 Swagger UI 中停用語法醒目提示（syntax highlighting）。

不更動設定時，語法醒目提示預設為啟用：

<img src="/img/tutorial/extending-openapi/image02.png">

但你可以將 `syntaxHighlight` 設為 `False` 來停用它：

					goto next
				}
			}
			if tok == scanner.EOF {
				p.errorf("unexpected EOF")
				return "", "", nil, false
			}
			// Split operands on comma. Also, the old syntax on x86 for a "register pair"
			// was AX:DX, for which the new syntax is DX, AX. Note the reordering.
			if tok == '\n' || tok == ';' || (nesting == 0 && (tok == ',' || tok == ':')) {
				if tok == ':' {

pass the internal type(s) as "type parameters" using square brackets: `[` and `]`

```Python
my_list: list[str]
```

That's all standard Python syntax for type declarations.

Use that same standard syntax for model attributes with internal types.

So, in our example, we can make `tags` be specifically a "list of strings":

{* ../../docs_src/body_nested_models/tutorial002_py310.py hl[12] *}

`swagger_ui_parameters`는 Swagger UI에 직접 전달된 구성을 포함하는 딕셔너리를 받습니다.

FastAPI는 이 구성을 **JSON** 형식으로 변환하여 JavaScript와 호환되도록 합니다. 이는 Swagger UI에서 필요로 하는 형식입니다.

## 구문 강조 비활성화 { #disable-syntax-highlighting }

예를 들어, Swagger UI에서 구문 강조 기능을 비활성화할 수 있습니다.

설정을 변경하지 않으면, 기본적으로 구문 강조 기능이 활성화되어 있습니다:

<img src="/img/tutorial/extending-openapi/image02.png">

    /**
     * Test that syntax errors are not cached and can be retried
     */
    @Test
    public void test_evaluate_syntaxErrorNotCached() {
        final GroovyEngine engine = new GroovyEngine();
        final Map<String, Object> params = new HashMap<>();
        final String invalidScript = "this is not valid {{{";

        // First call: syntax error returns null

如果需要配置它们，可以在创建 `FastAPI()` 应用对象时或调用 `get_swagger_ui_html()` 函数时传递 `swagger_ui_parameters` 参数。

`swagger_ui_parameters` 接受一个字典，该字典会直接传递给 Swagger UI。

FastAPI会将这些配置转换为 **JSON**，使其与 JavaScript 兼容，因为这是 Swagger UI 需要的。

## 禁用语法高亮 { #disable-syntax-highlighting }

比如，你可以禁用 Swagger UI 中的语法高亮。

当没有改变设置时，语法高亮默认启用：

<img src="/img/tutorial/extending-openapi/image02.png">

但是你可以通过设置 `syntaxHighlight` 为 `False` 来禁用 Swagger UI 中的语法高亮：

    assert isinstance(result, list)


def test_serialize_sequence_value_with_optional_list_pipe_union():
    """Test that serialize_sequence_value handles optional lists correctly (with new syntax)."""
    from fastapi._compat import v2

    field_info = FieldInfo(annotation=list[str] | None)
    field = v2.ModelField(name="items", field_info=field_info)

   * advantage of <a
   * href="https://docs.oracle.com/javase/tutorial/java/generics/genTypeInference.html#type-inference-instantiation">"diamond"
   * syntax</a>.
   */
  @SuppressWarnings("NonApiType") // acts as a direct substitute for a constructor call
  public static <E extends @Nullable Object> ArrayList<E> newArrayList() {
    return new ArrayList<>();
  }

  /**

# Python Types Intro { #python-types-intro }

Python has support for optional "type hints" (also called "type annotations").

These **"type hints"** or annotations are a special syntax that allow declaring the <dfn title="for example: str, int, float, bool">type</dfn> of a variable.

By declaring types for your variables, editors and tools can give you better support.