テキストプロンプトを使用して BananaAPI と Nano Banana エンジンで AI 画像を生成

• •ターゲットAPIの認証情報が必要な場合あり

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      "name": "フォーム — プロンプト取得",
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      "parameters": {
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        "content": "## Overview\nThis workflow integrates **BananaAPI.com** with the **Google Nano Banana** image generation engine. Users can submit prompts and optional reference images via a form, then the workflow calls BananaAPI.com, checks the task status in a loop, and finally returns the generated image link.\n\n**Why use it?**\n- Cost effective: only **$0.025 per image**\n- **Pay-as-you-go**: pay only for what you use\n- **Credits never expire**: no monthly subscription pressure\n\nIdeal for creators, marketers, and developers who want affordable and automated image generation."
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    {
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        "content": "## Prerequisites\n- **BananaAPI.com account + API key (Bearer)** — create your key at https://bananaapi.com/api\n- An **n8n instance** (Cloud or self-hosted)\n- Basic knowledge of AI prompts to get the best quality images\n\n⚠️ Never commit or share your API key publicly. Use **n8n Credentials** for production setups."
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    {
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      "name": "注記 — ステップ1（フォーム入力）",
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        "content": "## Step 1 — User Form Input\nThe **Form Trigger** asks the user to provide:\n- `api_token` (required) — Banana API Bearer token\n- `prompt` (required) — image description (e.g. *“a neon cyberpunk cat, detailed, 4k”*)\n- `Output Format [optional]` — choose PNG or JPEG\n- `Image Size [optional]` — 16:9, 9:16, 1:1, 3:4, 4:3\n- `image_url_1 ... image_url_5 [optional]` — reference images for editing or transformation"
      },
      "typeVersion": 1
    },
    {
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      "position": [
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        "content": "## Step 2 — Submit to Banana API\nThe **HTTP POST** node sends the request:\n- URL: `https://bananaapi.com/api/n8n/generate/`\n- Headers:\n  - `Content-Type: application/json`\n  - `Authorization: Bearer {{ $json.api_token }}`\n- JSON Body includes:\n  - `prompt`\n  - `image_size`\n  - `output_format`\n  - `image_urls` (array of up to 5)\n\nBananaAPI will return a `taskId` to track progress."
      },
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    {
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      "name": "注記 — ステップ3（処理中）",
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        "content": "## Step 3 — Processing\nBananaAPI forwards the request to the **Nano Banana** engine, which generates or edits the image based on the prompt and optional input images.\n\n⏱ Average generation time: a few seconds to ~1 minute, depending on complexity and server load.\n- After 5s wait, the workflow calls:\n  `GET https://bananaapi.com/api/n8n/image-status/{{ taskId }}`\n- If `status != completed`, the loop waits 5s and retries\n- When `status = completed`, the workflow continues"
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      "name": "注記 — ステップ5（出力）",
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        "content": "## Step 4 — Return Output\nWhen completed, the **Set node** outputs:\n- `image_url` — the final generated image link\n- `task_id` — the task reference ID\n- `status` — task completion state\n\n💡 Tip: Add a **Webhook Response** node to return a clean JSON payload for frontend apps."
      },
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      "name": "注記 — API リファレンス",
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        "content": "## API Reference\n- **POST** `https://bananaapi.com/api/n8n/generate/`\n- **GET** `https://bananaapi.com/api/n8n/image-status/{taskId}`\n\nDocs: https://bananaapi.com/api\n\n✅ Always include `Authorization: Bearer <token>` in headers."
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      "name": "注記 — 料金メリット",
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        "content": "## Pricing Advantages\n- **Only $0.025 per image** — very cost-effective\n- **Pay-as-you-go**: no monthly subscription\n- **Credits never expire** — use anytime, no rush\n\nPerfect for scaling automation workflows or experimenting without wasted costs."
      },
      "typeVersion": 1
    },
    {
      "id": "1d11806a-56e9-4e02-9aeb-5dfef750b1ae",
      "name": "注記 — トラブルシューティング",
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      "position": [
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      "parameters": {
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        "content": "## Troubleshooting\n- **401/403 Unauthorized** → Check Authorization header (`Bearer token`)\n- **Invalid JSON** → Ensure POST body is valid JSON (double quotes, no trailing commas)\n- **No imageUrl returned** → Task still pending; wait longer or re-check taskId\n- **Slow performance** → Increase wait interval from 5s to 8–10s"
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