nextjs-google-maps

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This skill should be used when the user asks to "add Google Maps", "integrate maps", "show location on map", "implement place search", "add route calculation", "geocode address", "display markers", "create heatmap", "add Street View", "implement drawing tools", "Google Maps を追加", "地図を表示", "位置情報を表示", "場所検索を実装", "ルート計算", "住所から座標を取得", "マーカーを表示", "ヒートマップを作成", "ストリートビュー", "描画ツールを追加", "@react-google-maps/api の使い方", or needs guidance on Google Maps Platform integration with Next.js App Router, including Places API, Directions API, Geocoding API, visualization features, and performance optimization.

fumiya-kume By fumiya-kume schedule Updated 1/17/2026

name: nextjs-google-maps description: | This skill should be used when the user asks to "add Google Maps", "integrate maps", "show location on map", "implement place search", "add route calculation", "geocode address", "display markers", "create heatmap", "add Street View", "implement drawing tools", "Google Maps を追加", "地図を表示", "位置情報を表示", "場所検索を実装", "ルート計算", "住所から座標を取得", "マーカーを表示", "ヒートマップを作成", "ストリートビュー", "描画ツールを追加", "@react-google-maps/api の使い方", or needs guidance on Google Maps Platform integration with Next.js App Router, including Places API, Directions API, Geocoding API, visualization features, and performance optimization. version: 1.0.0

Next.js Google Maps Integration

Next.js App Router で @react-google-maps/api を使用した Google Maps 統合ガイド。

対象スタック

  • Next.js 14+ (App Router)
  • React 18+
  • TypeScript
  • @react-google-maps/api v2.x

クイックスタート チェックリスト

  1. Google Cloud Platform でプロジェクトを作成
  2. 必要な API を有効化(Maps JavaScript API, Places API, Directions API, Geocoding API)
  3. API キーを作成し、リファラー制限を設定
  4. npm install @react-google-maps/api でライブラリをインストール
  5. .env.localNEXT_PUBLIC_GOOGLE_MAPS_API_KEY を設定
  6. Provider コンポーネントを作成
  7. Map コンポーネントを実装

インストール

npm install @react-google-maps/api
# または
yarn add @react-google-maps/api
# または
pnpm add @react-google-maps/api

環境変数の設定

.env.local ファイルを作成:

NEXT_PUBLIC_GOOGLE_MAPS_API_KEY=your_api_key_here

注意: NEXT_PUBLIC_ プレフィックスが必要です。これによりクライアントサイドで使用可能になります。

Google Cloud Platform セットアップ

1. プロジェクト作成

  1. Google Cloud Console にアクセス
  2. 新しいプロジェクトを作成
  3. 請求先アカウントをリンク(無料枠あり)

2. API の有効化

必要に応じて以下の API を有効化:

API 用途
Maps JavaScript API 地図の表示(必須)
Places API 場所検索・オートコンプリート
Directions API ルート計算
Geocoding API 住所⇔座標変換

3. API キーの作成と制限

  1. 「認証情報」→「認証情報を作成」→「API キー」
  2. アプリケーションの制限:
    • 種類: HTTP リファラー
    • 許可するリファラー: localhost:*, your-domain.com/*
  3. API の制限: 使用する API のみに制限

コアコンポーネント

Provider パターン(SSR 対応)

// components/google-maps-provider.tsx
'use client';

import { Libraries, useLoadScript } from '@react-google-maps/api';
import { createContext, useContext, ReactNode } from 'react';

const libraries: Libraries = ['places', 'drawing', 'visualization'];

interface GoogleMapsContextType {
  isLoaded: boolean;
}

const GoogleMapsContext = createContext<GoogleMapsContextType>({ isLoaded: false });

export function GoogleMapsProvider({ children }: { children: ReactNode }) {
  const { isLoaded, loadError } = useLoadScript({
    googleMapsApiKey: process.env.NEXT_PUBLIC_GOOGLE_MAPS_API_KEY!,
    libraries,
  });

  if (loadError) {
    return <div className="p-4 text-red-500">Google Maps の読み込みに失敗しました</div>;
  }

  if (!isLoaded) {
    return <div className="p-4">地図を読み込み中...</div>;
  }

  return (
    <GoogleMapsContext.Provider value={{ isLoaded }}>
      {children}
    </GoogleMapsContext.Provider>
  );
}

export function useGoogleMapsContext() {
  return useContext(GoogleMapsContext);
}

詳細: examples/google-maps-provider.tsx

基本的な Map コンポーネント

// components/map.tsx
'use client';

import { GoogleMap } from '@react-google-maps/api';
import { useCallback, useState } from 'react';

const containerStyle = {
  width: '100%',
  height: '400px',
};

const defaultCenter = {
  lat: 35.6812,
  lng: 139.7671,
};

export function Map() {
  const [map, setMap] = useState<google.maps.Map | null>(null);

  const onLoad = useCallback((map: google.maps.Map) => {
    setMap(map);
  }, []);

  const onUnmount = useCallback(() => {
    setMap(null);
  }, []);

  return (
    <GoogleMap
      mapContainerStyle={containerStyle}
      center={defaultCenter}
      zoom={15}
      onLoad={onLoad}
      onUnmount={onUnmount}
    />
  );
}

詳細: examples/basic-map.tsx

Layout での統合

// app/map/layout.tsx
import { GoogleMapsProvider } from '@/components/google-maps-provider';

export default function MapLayout({ children }: { children: React.ReactNode }) {
  return (
    <GoogleMapsProvider>
      {children}
    </GoogleMapsProvider>
  );
}

マーカーと InfoWindow

import { GoogleMap, Marker, InfoWindow } from '@react-google-maps/api';
import { useState } from 'react';

interface Location {
  id: string;
  position: google.maps.LatLngLiteral;
  title: string;
}

const locations: Location[] = [
  { id: '1', position: { lat: 35.6812, lng: 139.7671 }, title: '東京駅' },
  { id: '2', position: { lat: 35.6586, lng: 139.7454 }, title: '東京タワー' },
];

export function MapWithMarkers() {
  const [selectedId, setSelectedId] = useState<string | null>(null);

  return (
    <GoogleMap mapContainerStyle={containerStyle} center={locations[0].position} zoom={13}>
      {locations.map((location) => (
        <Marker
          key={location.id}
          position={location.position}
          onClick={() => setSelectedId(location.id)}
        >
          {selectedId === location.id && (
            <InfoWindow onCloseClick={() => setSelectedId(null)}>
              <div className="p-2">{location.title}</div>
            </InfoWindow>
          )}
        </Marker>
      ))}
    </GoogleMap>
  );
}

詳細: examples/map-with-markers.tsx

Places API(場所検索)

オートコンプリート

import { Autocomplete } from '@react-google-maps/api';
import { useCallback, useState } from 'react';

export function PlaceAutocomplete({
  onPlaceSelect
}: {
  onPlaceSelect: (place: google.maps.places.PlaceResult) => void
}) {
  const [autocomplete, setAutocomplete] = useState<google.maps.places.Autocomplete | null>(null);

  const onLoad = useCallback((ac: google.maps.places.Autocomplete) => {
    setAutocomplete(ac);
  }, []);

  const onPlaceChanged = useCallback(() => {
    if (autocomplete) {
      const place = autocomplete.getPlace();
      if (place.geometry?.location) {
        onPlaceSelect(place);
      }
    }
  }, [autocomplete, onPlaceSelect]);

  return (
    <Autocomplete
      onLoad={onLoad}
      onPlaceChanged={onPlaceChanged}
      options={{
        componentRestrictions: { country: 'jp' },
        types: ['establishment'],
      }}
    >
      <input
        type="text"
        placeholder="場所を検索..."
        className="w-full px-4 py-2 border rounded-lg"
      />
    </Autocomplete>
  );
}

詳細: examples/places-autocomplete.tsx, references/places-api.md

Directions API(ルート計算)

import { DirectionsRenderer, DirectionsService } from '@react-google-maps/api';
import { useCallback, useState } from 'react';

export function DirectionsMap({
  origin,
  destination,
}: {
  origin: google.maps.LatLngLiteral;
  destination: google.maps.LatLngLiteral;
}) {
  const [directions, setDirections] = useState<google.maps.DirectionsResult | null>(null);

  const directionsCallback = useCallback(
    (result: google.maps.DirectionsResult | null, status: google.maps.DirectionsStatus) => {
      if (status === 'OK' && result) {
        setDirections(result);
      }
    },
    []
  );

  return (
    <GoogleMap mapContainerStyle={containerStyle} center={origin} zoom={12}>
      {!directions && (
        <DirectionsService
          options={{
            origin,
            destination,
            travelMode: google.maps.TravelMode.DRIVING,
          }}
          callback={directionsCallback}
        />
      )}
      {directions && <DirectionsRenderer directions={directions} />}
    </GoogleMap>
  );
}

詳細: examples/directions-route.tsx, references/directions-api.md

ジオコーディング

// utils/geocoding.ts
export async function geocodeAddress(address: string): Promise<google.maps.LatLngLiteral | null> {
  const geocoder = new google.maps.Geocoder();

  return new Promise((resolve) => {
    geocoder.geocode({ address }, (results, status) => {
      if (status === 'OK' && results?.[0]) {
        const location = results[0].geometry.location;
        resolve({ lat: location.lat(), lng: location.lng() });
      } else {
        resolve(null);
      }
    });
  });
}

export async function reverseGeocode(
  location: google.maps.LatLngLiteral
): Promise<string | null> {
  const geocoder = new google.maps.Geocoder();

  return new Promise((resolve) => {
    geocoder.geocode({ location }, (results, status) => {
      if (status === 'OK' && results?.[0]) {
        resolve(results[0].formatted_address);
      } else {
        resolve(null);
      }
    });
  });
}

詳細: examples/geocoding-service.ts, references/geocoding-api.md

高度な可視化

ヒートマップ

import { HeatmapLayer } from '@react-google-maps/api';

const heatmapData = [
  new google.maps.LatLng(35.6812, 139.7671),
  new google.maps.LatLng(35.6586, 139.7454),
  // ... more points
];

export function HeatmapMap() {
  return (
    <GoogleMap mapContainerStyle={containerStyle} center={defaultCenter} zoom={12}>
      <HeatmapLayer
        data={heatmapData}
        options={{
          radius: 20,
          opacity: 0.7,
        }}
      />
    </GoogleMap>
  );
}

詳細: examples/heatmap-layer.tsx, references/visualization.md

マーカークラスタリング

import { MarkerClusterer } from '@react-google-maps/api';

export function ClusteredMap({ locations }: { locations: Location[] }) {
  return (
    <GoogleMap mapContainerStyle={containerStyle} center={defaultCenter} zoom={10}>
      <MarkerClusterer>
        {(clusterer) =>
          locations.map((location) => (
            <Marker
              key={location.id}
              position={location.position}
              clusterer={clusterer}
            />
          ))
        }
      </MarkerClusterer>
    </GoogleMap>
  );
}

詳細: examples/marker-clusterer.tsx

ストリートビュー

import { StreetViewPanorama } from '@react-google-maps/api';

export function StreetViewMap({ position }: { position: google.maps.LatLngLiteral }) {
  return (
    <GoogleMap mapContainerStyle={containerStyle} center={position} zoom={15}>
      <StreetViewPanorama
        position={position}
        visible={true}
        options={{
          addressControl: true,
          fullscreenControl: true,
        }}
      />
    </GoogleMap>
  );
}

詳細: examples/street-view.tsx, references/streetview.md

描画ツール

import { DrawingManager } from '@react-google-maps/api';

export function DrawingMap() {
  const onPolygonComplete = (polygon: google.maps.Polygon) => {
    const path = polygon.getPath();
    const coordinates = path.getArray().map((latLng) => ({
      lat: latLng.lat(),
      lng: latLng.lng(),
    }));
    console.log('Polygon coordinates:', coordinates);
  };

  return (
    <GoogleMap mapContainerStyle={containerStyle} center={defaultCenter} zoom={15}>
      <DrawingManager
        drawingMode={google.maps.drawing.OverlayType.POLYGON}
        onPolygonComplete={onPolygonComplete}
        options={{
          drawingControl: true,
          drawingControlOptions: {
            position: google.maps.ControlPosition.TOP_CENTER,
            drawingModes: [
              google.maps.drawing.OverlayType.POLYGON,
              google.maps.drawing.OverlayType.POLYLINE,
              google.maps.drawing.OverlayType.CIRCLE,
            ],
          },
        }}
      />
    </GoogleMap>
  );
}

詳細: examples/drawing-manager.tsx, references/drawing-tools.md

パフォーマンス最適化

Dynamic Import(SSR 無効化)

import dynamic from 'next/dynamic';

const MapComponent = dynamic(
  () => import('@/components/map').then((mod) => mod.Map),
  {
    ssr: false,
    loading: () => <div className="h-[400px] bg-gray-100 animate-pulse" />
  }
);

Map インスタンスの再利用

// Map インスタンスを ref で保持し、再レンダリング時の再生成を防ぐ
const mapRef = useRef<google.maps.Map | null>(null);

const onLoad = useCallback((map: google.maps.Map) => {
  mapRef.current = map;
}, []);

詳細: references/performance.md

エラーハンドリング

export function handleGoogleMapsError(error: unknown): string {
  if (error instanceof Error) {
    const message = error.message;

    if (message.includes('RefererNotAllowedMapError')) {
      return 'API キーのリファラー制限を確認してください';
    }
    if (message.includes('InvalidKeyMapError')) {
      return 'API キーが無効です';
    }
    if (message.includes('ApiNotActivatedMapError')) {
      return '必要な API が有効化されていません';
    }
    if (message.includes('OverQueryLimitMapError')) {
      return 'API 呼び出し制限を超えました';
    }
  }

  return '不明なエラーが発生しました';
}

詳細: references/troubleshooting.md

TypeScript 型定義

// types/google-maps.ts

export interface MapLocation {
  id: string;
  position: google.maps.LatLngLiteral;
  title: string;
  description?: string;
  icon?: string;
}

export interface DirectionsRequest {
  origin: google.maps.LatLngLiteral | string;
  destination: google.maps.LatLngLiteral | string;
  travelMode: google.maps.TravelMode;
  waypoints?: google.maps.DirectionsWaypoint[];
}

export interface GeocodingResult {
  address: string;
  location: google.maps.LatLngLiteral;
  placeId: string;
  formattedAddress: string;
}

クイックリファレンス

コンポーネント 用途
GoogleMap 地図の表示
Marker マーカーの表示
InfoWindow 情報ウィンドウ
Autocomplete 場所検索
DirectionsService ルート計算
DirectionsRenderer ルート表示
HeatmapLayer ヒートマップ
MarkerClusterer マーカークラスタリング
StreetViewPanorama ストリートビュー
DrawingManager 描画ツール

追加リソース

リファレンス

コード例

Install via CLI
npx skills add https://github.com/fumiya-kume/toy-poodle-love --skill nextjs-google-maps
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