また、生成されたスキーマが <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.2.md" class="external-link" target="_blank">OpenAPI</a> 標準に従っているので、互換性のあるツールが多数あります。

このため、**FastAPI**自体が代替のAPIドキュメントを提供します（ReDocを使用）。これは、 <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a> にアクセスすると確認できます。

<img src="/img/tutorial/path-params/image02.png">

同様に、互換性のあるツールが多数あります（多くの言語用のコード生成ツールを含む）。

## Pydantic

package org.apache.maven.embedder;

/**
 * Hello world!
 *
 */
public class App
{
    public static void main( String[] args )
    {
        System.out.println( "Hello World!" );
    }

from sqlmodel import Field, Session, SQLModel, create_engine, select


class HeroBase(SQLModel):
    name: str = Field(index=True)
    age: Union[int, None] = Field(default=None, index=True)


class Hero(HeroBase, table=True):
    id: Union[int, None] = Field(default=None, primary_key=True)
    secret_name: str


class HeroPublic(HeroBase):
    id: int


class HeroCreate(HeroBase):
    secret_name: str

 */

package com.google.common.collect.testing.testers;

import com.google.common.annotations.GwtCompatible;
import java.util.Locale;

/**
 * This class is emulated in GWT.
 *
 * @author Hayward Chan
 */
@GwtCompatible
final class Platform {

  /** Format the template with args, only supports the placeholder {@code %s}. */
  static String format(String template, Object... args) {

package gradlebuild.docs.dsl.docbook;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.LinkedList;

public class DefaultGenerationListener implements GenerationListener {
    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultGenerationListener.class);
    private final LinkedList<String> contextStack = new LinkedList<String>();

    @Override
    public void warning(String message) {

    }

    @Override
    protected Class<? extends CrawlingInfo> typeOfSelectedEntity() {
        return CrawlingInfo.class;
    }

    @Override
    protected Class<CrawlingInfo> typeOfHandlingEntity() {
        return CrawlingInfo.class;
    }

    @Override
    protected Class<CrawlingInfoCB> typeOfHandlingConditionBean() {
        return CrawlingInfoCB.class;
    }

        return createOptionalEntity(doSelectByPK(id, tp), id);
    }

    @Override
    protected Class<? extends ElevateWordToLabel> typeOfSelectedEntity() {
        return ElevateWordToLabel.class;
    }

    @Override
    protected Class<ElevateWordToLabel> typeOfHandlingEntity() {

    }

    @Override
    protected Class<? extends JobLog> typeOfSelectedEntity() {
        return JobLog.class;
    }

    @Override
    protected Class<JobLog> typeOfHandlingEntity() {
        return JobLog.class;
    }

    @Override
    protected Class<JobLogCB> typeOfHandlingConditionBean() {
        return JobLogCB.class;
    }

    }

    @Override
    protected Class<? extends RoleType> typeOfSelectedEntity() {
        return RoleType.class;
    }

    @Override
    protected Class<RoleType> typeOfHandlingEntity() {
        return RoleType.class;
    }

    @Override
    protected Class<RoleTypeCB> typeOfHandlingConditionBean() {
        return RoleTypeCB.class;
    }

    }

    @Override
    protected Class<? extends ThumbnailQueue> typeOfSelectedEntity() {
        return ThumbnailQueue.class;
    }

    @Override
    protected Class<ThumbnailQueue> typeOfHandlingEntity() {
        return ThumbnailQueue.class;
    }

    @Override
    protected Class<ThumbnailQueueCB> typeOfHandlingConditionBean() {
        return ThumbnailQueueCB.class;
    }