Nano Banana 2 Lite (Gemini 3.1 Flash-Lite Image) is now available in AI Gateway.

import { GoogleGenAI } from '@google/genai';

// Netlify Function: Generate an image with Gemini 3.1 Flash Lite Image and return it directly.
// Usage (GET): /.netlify/functions/gemini-31-flash-lite-image?prompt=Your+prompt+here
// Returns: binary image (PNG/JPEG/etc) with proper content-type. If no image, JSON error.

export default async (request: Request) => {
    const url = new URL(request.url);
    const prompt = url.searchParams.get('prompt') || 'two happy bananas holding flashlights';
    const ai = new GoogleGenAI({});

    try {
        const response = await ai.models.generateContent({
            model: 'gemini-3.1-flash-lite-image',
            contents: prompt,
            config: {
                imageConfig: {
                    aspectRatio: '16:9',
                    imageSize: '1K'
                }
            }
        });

        let imagePart = null;
        for (const part of response.candidates[0].content.parts) {
            if (part.inlineData) {
                imagePart = part.inlineData;
                break;
            }
        }

        const bytes = Buffer.from(imagePart.data, 'base64');
        const mimeType = imagePart.mimeType || 'image/png';

        return new Response(bytes, {
            status: 200,
            headers: {
                'Content-Type': mimeType,
                'Cache-Control': 'no-store'
            }
        });
    } catch (err) {
        return new Response(JSON.stringify({ error: String(err), prompt }), {
            status: 500,
            headers: { 'Content-Type': 'application/json' }
        });
    }
};