Nano Banana Pro API

Complete API reference for Nano Banana Pro models powered by Google Gemini.

Model Variants

This API supports two model variants:

Quick Comparison

Supported Aspect Ratios

Both models support 11 aspect ratios:

• 16:9 (default), 9:16, 1:1, 3:2, 2:3, 4:3, 3:4, 4:5, 5:4, 21:9, 9:21

Nano Banana Pro (Text-to-Image)

Endpoint

POST /api/v1/image/task

Authentication

Authorization: Bearer YOUR_API_KEY

Request Parameters

Required

Note: The width:height ratio must be one of: "21:9", "9:21", "16:9", "9:16", "4:3", "3:4", "3:2", "2:3", "1:1"

Example Request

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const response = await fetch('https://api.flaq.ai/api/v1/image/task', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    model_name: 'nano-banana-pro',
    prompt: 'A serene mountain landscape at sunset',
    width: 16,
    height: 9,
    resolution: '2k'
  })
});

const { data } = await response.json();
const taskId = data.task_id;

// Poll for results
const pollResponse = await fetch(
  `https://api.flaq.ai/api/v1/image/${taskId}`,
  {
    headers: { 'Authorization': 'Bearer YOUR_API_KEY' }
  }
);

const result = await pollResponse.json();
console.log(result.data.task_result.images[0].url);

Nano Banana Pro Edit (Image Editing)

Endpoint

POST /api/v1/image/task

Request Parameters

Required

Note: The width:height ratio must be one of: "21:9", "9:21", "16:9", "9:16", "4:3", "3:4", "3:2", "2:3", "1:1"

Single Image Edit Example

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{
  model_name: 'nano-banana-pro-edit',
  prompt: 'Change the sky to sunset colors',
  width: 16,
  height: 9,
  resolution: '2k',
  image_url_list: ['https://example.com/image.jpg']
}

Multi-Image Composition Example

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{
  model_name: 'nano-banana-pro-edit',
  prompt: 'Combine these images into a cohesive landscape',
  width: 16,
  height: 9,
  resolution: '2k',
  image_url_list: ['https://example.com/image1.jpg', 'https://example.com/image2.jpg', 'https://example.com/image3.jpg']
}

Response Format

Initial Response

Both models return a task_id for polling:

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{
  "code": 0,
  "data": {
    "task_id": "{task_id}",
    "task_status": "submitted",
    "response_url": "https://api.flaq.ai/api/v1/image/{task_id}"
  },
  "message": "success"
}

Polling Response

Poll /api/v1/image/{taskId} to check status:

jsonCopy
{
  "code": 0,
  "data": {
    "task_id": "{task_id}",
    "task_status": "succeed",
    "task_status_msg": null,
    "response_url": "https://api.flaq.ai/api/v1/image/{task_id}",
    "task_result": {
      "credit": 0.0997,
      "images": [
        {
          "url": "https://example.com/generated-image.jpeg"
        }
      ]
    }
  },
  "message": "success"
}

Status Values

• submitted: Task accepted
• processing: Generation in progress
• succeed: Generation completed successfully
• failed: Generation failed

Error Handling

Common Errors

Invalid Resolution

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{
  "code": 400,
  "message": "Resolution must be one of: 1k, 2k, 4k"
}

Invalid Aspect Ratio

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{
  "code": 400,
  "message": "Ratio must be one of: 16:9, 9:16, 1:1, 3:2, 2:3, 4:3, 3:4, 4:5, 5:4, 21:9, 9:21"
}

Missing Image URL (Edit Mode)

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{
  "code": 400,
  "message": "image_url_list is required for nano-banana-pro-edit"
}

Best Practices

Text-to-Image Tips

1. Be Specific: Include subject, style, lighting, composition details
2. Choose Resolution Wisely: 2K is default and cost-effective, use 4K for highest quality
3. Aspect Ratio Selection: Choose ratio based on your use case (16:9 for web, 9:16 for mobile)
4. Prompt Quality: More detailed prompts generally produce better results

Image Editing Tips

1. Clear Instructions: Be specific about what to change
2. Multi-Image Composition: Can combine up to 14 images in a single request
3. Resolution Matching: Output resolution can differ from input
4. Prompt Guidance: Describe the desired outcome, not just the changes

Example Use Cases

Product Photography

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{
  model_name: 'nano-banana-pro',
  prompt: 'Professional product shot of luxury watch on marble surface',
  width: 4,
  height: 3,
  resolution: '4k'
}

Multi-Image Collage

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{
  model_name: 'nano-banana-pro-edit',
  image_url_list: [
    'photo1.jpg',
    'photo2.jpg',
    'photo3.jpg'
  ],
  prompt: 'Create a seamless collage with these vacation photos',
  width: 16,
  height: 9,
  resolution: '2k'
}

Image Enhancement

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{
  model_name: 'nano-banana-pro-edit',
  image_url_list: ['photo.jpg'],
  prompt: 'Enhance colors and add dramatic lighting',
  width: 1,
  height: 1,
  resolution: '2k'
}