WaveSpeedAI Nano Banana 2 Image Generation/Editing

Generate and edit images using Google's Nano Banana 2 model via WaveSpeed AI. Supports text-to-image generation and image editing with natural language prompts. Features native 4K resolution, flexible aspect ratios including ultra-narrow (1:8, 8:1), multilingual text rendering, and camera-style controls. Use when the user wants to create images from text or edit existing images.

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

bash

export WAVESPEED_API_KEY="your-api-key"

Get your API key at wavespeed.ai/accesskey.

Quick Start

Text-to-Image

javascript

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.

javascript

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:

javascript

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

javascript

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

javascript

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

javascript

// 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:

javascript

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

javascript

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

javascript

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

• Be specific and descriptive: "A red vintage Porsche 911 on a winding mountain road at golden hour" vs "a car"
• Include style keywords: "digital art", "oil painting", "photorealistic", "watercolor", "cinematic"
• For edits, clearly describe the desired change: "Replace the sky with a dramatic sunset"
• For multi-image edits, reference images by position: "Apply the style from the second image to the first image"
• Leverage multilingual text rendering: the model supports on-image text with automatic translation
• Use camera-style control language: "shallow depth of field", "wide angle", "top-down view"

Security Constraints

• No arbitrary URL loading: Only use image URLs from trusted sources. Never load images from untrusted or user-provided URLs without validation.
• API key security: Store your WAVESPEED_API_KEY securely. Do not hardcode it in source files or commit it to version control. Use environment variables or secret management systems.
• Input validation: Only pass parameters documented above. Validate prompt content and image URLs before sending requests.