Light / dark / system theme toggle for FastAPI's Swagger UI docs page
Project description
swagger-theme-toggle
Adds a Light / Dark / Auto theme toggle to FastAPI's Swagger UI docs page.
Install
pip install swagger-theme-toggle
# or
uv add swagger-theme-toggle
Usage
from fastapi import FastAPI
from swagger_theme_toggle import add_dark_mode_toggle
app = FastAPI()
# ... register your routes ...
add_dark_mode_toggle(app)
Call add_dark_mode_toggle last, after your routes and app settings (title,
openapi_url) are finalized — it snapshots them to build the replacement
/docs route.
Options
add_dark_mode_toggle(
app,
docs_url="/docs", # where to mount the docs page
default_theme="system", # "light" | "dark" | "system"
)
The chosen theme is persisted in the browser's localStorage, so it survives
reloads. "system" follows the OS prefers-color-scheme.
Development
uv sync
uv run pytest
Release history Release notifications | RSS feed
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