/// note

Having a default value of any type, including `None`, makes the parameter optional (not required).

///

## Required parameters { #required-parameters }

When we don't need to declare more validations or metadata, we can make the `q` query parameter required just by not declaring a default value, like:

```Python
q: str
```

instead of:

```Python

                    "summary": "Read Item",
                    "operationId": "read_item_items__item_id__get",
                    "parameters": [
                        {
                            "required": True,
                            "schema": {"title": "Item Id", "type": "string"},
                            "name": "item_id",
                            "in": "path",
                        }

@pytest.mark.parametrize(
    "path",
    ["/optional-str", "/model-optional-str"],
)
def test_optional_str_schema(path: str):
    assert app.openapi()["paths"][path]["get"]["parameters"] == [
        {
            "required": False,
            "schema": {
                "anyOf": [{"type": "string"}, {"type": "null"}],
                "title": "P",
            },
            "name": "p",
            "in": "cookie",
        }
    ]

                                    "$ref": "#/components/schemas/Body_post_form_form__post"
                                }
                            }
                        },
                        "required": True,
                    },
                    "responses": {
                        "200": {
                            "description": "Successful Response",

                    },
                    "summary": "Read Items",
                    "operationId": "read_items_items__get",
                    "parameters": [
                        {
                            "required": False,
                            "schema": {
                                "anyOf": [
                                    {
                                        "type": "string",

                    "summary": "Update Item",
                    "operationId": "update_item_items__item_id__put",
                    "parameters": [
                        {
                            "required": True,
                            "schema": {
                                "title": "The ID of the item to get",
                                "maximum": 1000.0,
                                "minimum": 0.0,

    "tutorial004": dedent("""
        Create an item with all the information:

        - **name**: each item must have a name
        - **description**: a long description
        - **price**: required
        - **tax**: if the item doesn't have tax, you can omit this
        - **tags**: a set of unique tag strings for this item
    """).strip(),
}


@pytest.fixture(
    name="mod_name",
    params=[

          <type>String</type>
          <required>true</required>
        </field>
        <field>
          <version>1.0.0</version>
          <name>description</name>
          <description>The description of what this expression references, and what it's generally used for.</description>
          <type>String</type>
          <required>true</required>
        </field>
        <field>

                            }
                        },
                        "required": True,
                    },
                }
            }
        },
        "components": {
            "schemas": {
                "Items": {
                    "title": "Items",
                    "required": ["items"],
                    "type": "object",
                    "properties": {

      label: Expected Behavior
      description: Tell us how it should work
    validations:
      required: true
  - type: textarea
    id: current-behavior
    attributes:
      label: Current Behavior (optional)
      description: Is there a way to achieve the same or similar outcome today?
    validations:
      required: false
  - type: textarea
    id: context
    attributes:
      label: Context
      description: |