```

## Recap

You can declare additional validations and metadata for your parameters.

Generic validations and metadata:

* `alias`
* `title`
* `description`
* `deprecated`

Validations specific for strings:

* `min_length`
* `max_length`
* `pattern`

In these examples you saw how to declare validations for `str` values.

            $repositoriesBlock
            dependencies {
                implementation(gradleKotlinDsl())
            }
            tasks.withType<KotlinCompile>().configureEach {
                // Work around JVM validation issue: https://youtrack.jetbrains.com/issue/KT-66919
                jvmTargetValidationMode = org.jetbrains.kotlin.gradle.dsl.jvm.JvmTargetValidationMode.WARNING
            }
        """)

**FastAPI** will do the automatic conversion from the request, so that the parameter `item` receives its specific content and the same for `user`.

It will perform the validation of the compound data, and will document it like that for the OpenAPI schema and automatic docs.

## Singular values in body

*   Fixes a missing validation which causes `TensorSummaryV2` to crash ([CVE-2022-29193](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-29193))
*   Fixes a missing validation which crashes `QuantizeAndDequantizeV4Grad` ([CVE-2022-29192](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-29192))

          Size of each xDS push.
        |||
      ),
    ]),
  ], panelHeight=10, startY=3)
  + grid.makeGrid([
    row.new('Webhooks')
    + row.withPanels([
      panels.timeSeries.simple(
        'Validation', queries.validateWebhook, |||
          Rate of XDS push operations, by type. This is incremented on a per-proxy basis.
        |||
      ),
      panels.timeSeries.simple(

    /**
     * Prepares to load or create a model. Does nothing if the cached model is available or else prepares to capture
     * configuration fingerprints and validation problems and then runs the given function.
     */
    fun maybePrepareModel(action: () -> Unit)

    /**

```Python
item: Item
```

...and with that single declaration you get:

* Editor support, including:
    * Completion.
    * Type checks.
* Validation of data:
    * Automatic and clear errors when the data is invalid.
    * Validation even for deeply nested JSON objects.

    ```

## Recap

With `Query`, `Path` (and others you haven't seen yet) you can declare metadata and string validations in the same ways as with [Query Parameters and String Validations](query-params-str-validations.md){.internal-link target=_blank}.

And you can also declare numeric validations:

* `gt`: `g`reater `t`han
* `ge`: `g`reater than or `e`qual
* `lt`: `l`ess `t`han
* `le`: `l`ess than or `e`qual

        internalReporter.create {
            id(
                "configuration-cache-" + DeprecationMessageBuilder.createDefaultDeprecationId(message),
                message,
                GradleCoreProblemGroup.validation()
            )
            contextualLabel(message)
            documentOfProblem(problem)
            locationOfProblem(problem)
            severity(severity.toProblemSeverity())

# disable_pgv: disables protoc-gen-validation. This is not used buts adds many MB to Envoy protos
# not set vtprotobuf: this adds some performance improvement, but at a binary cost increase that is not worth it for the agent
AGENT_TAGS=agent,disable_pgv
# disable_pgv: disables protoc-gen-validation. This is not used buts adds many MB to Envoy protos