Nano Banana parameters

Pass these fields inside the top-level input object.

Field	Type	Required	Notes
`prompt`	string	Yes	Describe the desired image or edit.
`aspect_ratio`	string	No	Use a supported ratio such as `1:1` or `16:9`.
`resolution`	string	No	Supported values depend on the selected model ID. Use uppercase `1K`, `2K`, or `4K` where available.
`image`	object	No	Source image data for editing; preserve its actual MIME type.

Do not assume every model ID supports every resolution. Validate against the current model catalog before sending production traffic.

Provide prompt and optionally choose aspect_ratio and resolution.

Add a source image and explain the desired change in prompt.