### Use the `RequestValidationError` body

The `RequestValidationError` contains the `body` it received with invalid data.

You could use it while developing your app to log the body and debug it, return it to the user, etc.

```Python hl_lines="14"
{!../../../docs_src/handling_errors/tutorial005.py!}
```

Now try sending an invalid item like:

```JSON
{
  "title": "towel",

   *
   * @param lastGoodStreamId the last stream ID processed, or zero if no streams were processed.
   * @param errorCode reason for closing the connection.
   * @param debugData only valid for HTTP/2; opaque debug data to send.
   */
  @Throws(IOException::class)
  fun goAway(
    lastGoodStreamId: Int,
    errorCode: ErrorCode,
    debugData: ByteArray,
  ) {
    this.withLock {

#!/bin/bash

if [ -n "$TEST_DEBUG" ]; then
	set -x
fi

pkill minio
rm -rf /tmp/xl
rm -rf /tmp/xltier

if [ ! -f ./mc ]; then
	wget --quiet -O mc https://dl.minio.io/client/mc/release/linux-amd64/mc &&
		chmod +x mc
fi

export CI=true
export MINIO_SCANNER_SPEED=fastest

(minio server http://localhost:9000/tmp/xl/{1...10}/disk{0...1} 2>&1 >/tmp/decom.log) &
pid=$!

sleep 30

			wantException:    true,
		},
		{ // logger name invalid
			execClientConfig: loggingConfig,
			args:             strings.Split("log details-v1-5b7f94f9bc-wp5tb --level xxx:debug", " "),
			expectedString:   "unrecognized logger name: xxx",
			wantException:    true,
		},
		{ // logger name valid, but logging level invalid
			execClientConfig: loggingConfig,

	}

	db, err := gorm.Open(postgres.Open(postgresDSN), &gorm.Config{PrepareStmt: true})
	if err != nil {
		t.Errorf("Open err:%v", err)
	}
	if debug := os.Getenv("DEBUG"); debug == "true" {
		db.Logger = db.Logger.LogMode(logger.Info)
	} else if debug == "false" {
		db.Logger = db.Logger.LogMode(logger.Silent)
	}

	type Object1 struct {
		ID uint
	}
	type Object2 struct {
		ID     uint

It can be used by the frontend team (that can also be yourself).

It can be used by third party applications and systems.

And it can also be used by yourself, to debug, check and test the same application.

## The `password` flow

Now let's go back a bit and understand what is all that.

  - author: William Hayes
    author_link: https://medium.com/@williamhayes
    link: https://medium.com/@williamhayes/fastapi-starlette-debug-vs-prod-5f7561db3a59
    title: FastAPI/Starlette debug vs prod
  - author: Mukul Mantosh
    author_link: https://twitter.com/MantoshMukul
    link: https://www.jetbrains.com/pycharm/guide/tutorials/fastapi-aws-kubernetes/

                        .map(Object::toString)
                        .toList();
                if (!Objects.equals(oldRepos, newRepos)) {
                    logger.debug("Merging repositories from " + model.getId() + "\n"
                            + newRepos.stream().map(s -> "    " + s).collect(Collectors.joining("\n")));
                }
            }

    val jsoup = "org.jsoup:jsoup"
    val jtar = "org.kamranzafar:jtar"
    val kotlinCoroutines = "org.jetbrains.kotlinx:kotlinx-coroutines-core"
    val kotlinCoroutinesDebug = "org.jetbrains.kotlinx:kotlinx-coroutines-debug"
    val littleproxy = "xyz.rogfam:littleproxy"
    val mina = "org.apache.mina:mina-core"
    val mockitoCore = "org.mockito:mockito-core"
    val mockitoKotlin = "com.nhaarman:mockito-kotlin"

will error out if you have any **mismatch** in the data used.

So, you would **detect many errors** very early in the development cycle instead of having to wait for the errors to show up to your final users in production and then trying to debug where the problem is. ✨...