WaveSpeedAI Nano Banana 2 Image Generation/Editing

WaveSpeedAI Nano Banana 2 Image Generation/Editing

Generate and edit images using Google's Nano Banana 2 model via the WaveSpeed AI platform. Supports both text-to-image generation and natural-language image editing with up to 14 input images.

Authentication

export WAVESPEED_API_KEY="your-api-key"

Get your API key at wavespeed.ai/accesskey.

Quick Start

Text-to-Image

import wavespeed from 'wavespeed';
const output_url = (await wavespeed.run(
  "google/nano-banana-2/text-to-image",
  { prompt: "A serene Japanese garden with cherry blossoms, watercolor style" }
))["outputs"][0];

Image Editing

The images parameter accepts an array of image URLs. If you have local files, upload them first with wavespeed.upload() to get a URL.

import wavespeed from 'wavespeed';
// Upload a local image to get a URL
const imageUrl = await wavespeed.upload("/path/to/photo.png");
const output_url = (await wavespeed.run(
  "google/nano-banana-2/edit",
  {
    images: [imageUrl],
    prompt: "Replace the sky with a dramatic sunset"
  }
))["outputs"][0];

You can also pass existing image URLs directly:

const output_url = (await wavespeed.run(
  "google/nano-banana-2/edit",
  {
    images: ["https://example.com/photo.jpg"],
    prompt: "Replace the sky with a dramatic sunset"
  }
))["outputs"][0];

API Endpoints

Text-to-Image

Model ID: google/nano-banana-2/text-to-image

Generate images from text prompts.

#### Parameters

| Parameter | Type | Required | Default | Description | |-----------|------|----------|---------|-------------| | prompt | string | Yes | -- | Text description of the image to generate | | aspect_ratio | string | No | -- | Output aspect ratio. One of: 1:1, 3:2, 2:3, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9, 1:4, 4:1, 1:8, 8:1 | | resolution | string | No | 1k | Image resolution. One of: 1k, 2k, 4k | | output_format | string | No | png | Output format. One of: png, jpeg |

#### Example

import wavespeed from 'wavespeed';
const output_url = (await wavespeed.run(
  "google/nano-banana-2/text-to-image",
  {
    prompt: "A red vintage Porsche 911 on a winding mountain road at golden hour, photorealistic",
    aspect_ratio: "16:9",
    resolution: "2k",
    output_format: "png"
  }
))["outputs"][0];

Image Editing

Model ID: google/nano-banana-2/edit

Edit existing images using natural language prompts. Supports up to 14 input images.

#### Parameters

| Parameter | Type | Required | Default | Description | |-----------|------|----------|---------|-------------| | images | string[] | Yes | [] | URLs of input images to edit (1-14 images) | | prompt | string | Yes | -- | Text description of the desired edit | | aspect_ratio | string | No | -- | Output aspect ratio. One of: 1:1, 3:2, 2:3, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9, 1:4, 4:1, 1:8, 8:1 | | resolution | string | No | 1k | Image resolution. One of: 1k, 2k, 4k | | output_format | string | No | png | Output format. One of: png, jpeg |

#### Example

import wavespeed from 'wavespeed';
// Upload local images first, or use existing URLs
const imageUrl = await wavespeed.upload("/path/to/living-room.png");
const output_url = (await wavespeed.run(
  "google/nano-banana-2/edit",
  {
    images: [imageUrl],
    prompt: "Change the wall color to warm terracotta and add indoor plants",
    aspect_ratio: "16:9",
    resolution: "4k",
    output_format: "png"
  }
))["outputs"][0];

#### Multi-Image Editing

// Upload multiple local images
const faceUrl = await wavespeed.upload("/path/to/face.png");
const hairstyleUrl = await wavespeed.upload("/path/to/hairstyle.png");
const output_url = (await wavespeed.run(
  "google/nano-banana-2/edit",
  {
    images: [faceUrl, hairstyleUrl],
    prompt: "Apply the hairstyle from the second image to the person in the first image"
  }
))["outputs"][0];

Advanced Usage

Sync Mode

Use sync mode for a single request that waits for the result without polling:

const output_url = (await wavespeed.run(
  "google/nano-banana-2/text-to-image",
  { prompt: "A minimalist logo for a coffee shop" },
  { enableSyncMode: true }
))["outputs"][0];

Custom Client with Retry Configuration

import { Client } from 'wavespeed';
const client = new Client("your-api-key", {
  maxRetries: 2,
  maxConnectionRetries: 5,
  retryInterval: 1.0,
});
const output_url = (await client.run(
  "google/nano-banana-2/text-to-image",
  { prompt: "A futuristic cityscape at dusk" }
))["outputs"][0];

Error Handling with runNoThrow

import { Client, WavespeedTimeoutException, WavespeedPredictionException } from 'wavespeed';
const client = new Client();
const result = await client.runNoThrow(
  "google/nano-banana-2/text-to-image",
  { prompt: "A cat wearing a top hat" }
);
if (result.outputs) {
  console.log("Image URL:", result.outputs[0]);
  console.log("Task ID:", result.detail.taskId);
} else {
  console.log("Failed:", result.detail.error.message);
  if (result.detail.error instanceof WavespeedTimeoutException) {
    console.log("Request timed out - try increasing timeout");
  } else if (result.detail.error instanceof WavespeedPredictionException) {
    console.log("Model prediction failed");
  }
}

Aspect Ratio Options

| Aspect Ratio | Use Case | |-------------|----------| | 1:1 | Square — social media posts, profile pictures | | 3:2 | Landscape — standard photography | | 2:3 | Portrait — standard photography | | 3:4 | Portrait — social media, product images | | 4:3 | Landscape — presentations, web content | | 4:5 | Portrait — Instagram posts | | 5:4 | Landscape — print, web banners | | 9:16 | Vertical — mobile wallpapers, stories | | 16:9 | Widescreen — desktop wallpapers, video thumbnails | | 21:9 | Ultra-wide — cinematic, panoramic | | 1:4 | Ultra-tall — vertical banners, tall infographics | | 4:1 | Ultra-wide — horizontal banners, letterbox | | 1:8 | Extreme vertical — scrolling banners, tower ads | | 8:1 | Extreme horizontal — panoramic strips, timelines |

Resolution and Pricing

| Resolution | Cost | |------------|------| | 1k | $0.08 per image | | 2k | $0.12 per image | | 4k | $0.16 per image |

Prompt Tips

Security Constraints

import wavespeed from 'wavespeed';
const output_url = (await wavespeed.run(
  "google/nano-banana-2/text-to-image",
  {
    prompt: "A red vintage Porsche 911 on a winding mountain road at golden hour, photorealistic",
    aspect_ratio: "16:9",
    resolution: "2k",
    output_format: "png"
  }
))["outputs"][0];

Image Editing

Model ID: google/nano-banana-2/edit

Edit existing images using natural language prompts. Supports up to 14 input images.

#### Parameters

| Parameter | Type | Required | Default | Description | |-----------|------|----------|---------|-------------| | images | string[] | Yes | [] | URLs of input images to edit (1-14 images) | | prompt | string | Yes | -- | Text description of the desired edit | | aspect_ratio | string | No | -- | Output aspect ratio. One of: 1:1, 3:2, 2:3, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9, 1:4, 4:1, 1:8, 8:1 | | resolution | string | No | 1k | Image resolution. One of: 1k, 2k, 4k | | output_format | string | No | png | Output format. One of: png, jpeg |

#### Example

import wavespeed from 'wavespeed';
// Upload local images first, or use existing URLs
const imageUrl = await wavespeed.upload("/path/to/living-room.png");
const output_url = (await wavespeed.run(
  "google/nano-banana-2/edit",
  {
    images: [imageUrl],
    prompt: "Change the wall color to warm terracotta and add indoor plants",
    aspect_ratio: "16:9",
    resolution: "4k",
    output_format: "png"
  }
))["outputs"][0];

#### Multi-Image Editing

// Upload multiple local images
const faceUrl = await wavespeed.upload("/path/to/face.png");
const hairstyleUrl = await wavespeed.upload("/path/to/hairstyle.png");
const output_url = (await wavespeed.run(
  "google/nano-banana-2/edit",
  {
    images: [faceUrl, hairstyleUrl],
    prompt: "Apply the hairstyle from the second image to the person in the first image"
  }
))["outputs"][0];