NovelAI-API

A lightweight asynchronous Python wrapper for NovelAI image generation API.

Features

• Lightweight - Focuses on image generation only, providing a simple and easy-to-use interface.
• Concurrent - Supports both API and web backend, allowing to run two generating tasks simultaneously.
• Parameterized - Provides a Metadata class to easily set up generation parameters with type validation.
• Asynchronous - Utilizes asyncio to run generating tasks and return outputs efficiently.

Installation

pip install novelai

Usage

Initialization

Import required packages and initialize a client with your NovelAI account credentials.

import asyncio
from novelai import NAIClient

# Replace argument values with your actual account credentials
username = "Your NovelAI username"
password = "Your NovelAI password"

async def main():
    client = NAIClient(username, password, proxy=None)
    await client.init(timeout=30)

asyncio.run(main())

Image Generation

After initializing successfully, you can generate images with the generate_image method. The method takes a Metadata object as the first argument, and an optional host argument to specify the backend to use.

By passing verbose=True, the method will print the estimated Anlas cost each time a generating request is going to be made.

The full parameter list of Metadata can be found in the class definition.

from pathlib import Path
from novelai import Metadata, HOSTS

async def main():
    metadata = Metadata(
        prompt="1girl",
        negative_prompt="bad anatomy",
        width=832,
        height=1216,
        n_samples=1,
    )

    print(f"Estimated Anlas cost: {metadata.calculate_cost(is_opus=False)}")

    # Choose host between "HOSTS.API" and "HOSTS.WEB"
    output = await client.generate_image(
        metadata, host=HOSTS.WEB, verbose=False, is_opus=False
    )

    path = Path("./temp")
    path.mkdir(parents=True, exist_ok=True)

    for filename, data in output.items():
        dest = Path(path / filename)
        dest.write_bytes(data)
        print(f"Image saved as {dest.resolve()}")

asyncio.run(main())

Concurrent Generation

By default, NovelAI only allows one concurrent generating task at a time. However, this wrapper provides the ability to simultaneously run two concurrent generating tasks by sending requests to API and web backend respectively.

Note that API and web backend both have limit on concurrent generation. Therefore, running more than two concurrent tasks will result in a 429 Too Many Requests error.

Full usage example is provided under /docs.

async def task_api():
    await client.generate_image(metadata, host=HOSTS.API)
    print("API task completed")

async def task_web():
    await client.generate_image(metadata, host=HOSTS.WEB)
    print("Web task completed")

async def main():
    tasks = [
        asyncio.create_task(task_api()),
        asyncio.create_task(task_web()),
    ]
    await asyncio.wait(tasks)

asyncio.run(main())

Use in CLI

Optionally, a module function is also provided to directly generate access token in CLI.

Once a access token is generated, it will be valid for 30 days. Token can be used as the authentication header to make requests to NovelAI.

# Replace argument values with your actual account credentials
python3 -m novelai login <username> <password>

References

NovelAI Backend

Aedial/novelai-api

NovelAI Unofficial Knowledgebase