Google Cloud 画像 API で Nano Banana 2.1 を実行する

Google Cloud SDK の直接サンプル

これは、ご自身のプロジェクトと認証情報を使った Google Cloud への直接リクエストです。公開 LlamaGen API エンドポイントではありません。秘密鍵をプロンプトや公開ページに貼り付けないでください。

import { GoogleGenAI } from "@google/genai";
import { writeFile } from "node:fs/promises";

// @google/genai 1.45.0, matching the documented local workflow.
// Authenticate outside this file using Google Cloud credentials.
const ai = new GoogleGenAI({
  vertexai: true,
  project: process.env.GOOGLE_CLOUD_PROJECT,
  location: "global",
  httpOptions: { apiVersion: "v1" },
});
const response = await ai.models.generateContent({
  model: "gemini-nano-banana-2.1",
  contents: [{ role: "user", parts: [{
    text: "Create an original illustrated courier carrying a lantern in a rainy street. No text or logos.",
  }] }],
  config: {
    responseModalities: ["IMAGE"],
    candidateCount: 1,
    imageConfig: { aspectRatio: "3:2", imageSize: "2K" },
    thinkingConfig: { thinkingLevel: "HIGH" },
  },
});
const image = response.candidates?.[0]?.content?.parts?.find(
  (part) => part.inlineData?.data,
)?.inlineData;
if (!image?.data) throw new Error("No image returned; inspect the response before retrying.");
const extensions = { "image/png": "png", "image/jpeg": "jpg", "image/webp": "webp" };
const extension = extensions[image.mimeType];
if (!extension) throw new Error("Inspect the returned MIME type before saving.");
await writeFile(`nano-banana-2-1.${extension}`, Buffer.from(image.data, "base64"));