marimo-toml-editor

An interactive TOML config editor widget for Jupyter and marimo notebooks — built with anywidget.

Features

• 🗂 Tab-per-table navigation — each top-level TOML table is a tab
• ✏️ Type-aware editors — strings, numbers, booleans (toggle), colors (color picker + hex field)
• 📋 Rich list editor — per-item rows with reorder (↑↓) and delete
• 🪆 Inline dict editor — shallow nested tables rendered as compact key-value rows
• 🏷 Type badges — each key shows its type at a glance (str, int, bool, [], {})
• 🔍 Search / filter — filter keys within a tab
• ↩ Undo / Redo — full history
• 💾 Save to disk — requires tomli-w
• 🌗 Light + dark mode — follows system preference

Install

pip install marimo-toml-editor          # read-only
pip install "marimo-toml-editor[save]"  # with save support (tomli-w)

Usage

In marimo

import marimo as mo
from marimo_toml_editor import TomlConfigEditor

editor = mo.ui.anywidget(TomlConfigEditor("config.toml"))
editor

Access the current data reactively:

editor.value["data"]   # dict with the current TOML contents

In Jupyter

from marimo_toml_editor import TomlConfigEditor

w = TomlConfigEditor("config.toml")
w

Start from a dict (no file)

from marimo_toml_editor import TomlConfigEditor

w = TomlConfigEditor()
w.data = {
    "title": "My App",
    "debug": False,
    "server": {"host": "0.0.0.0", "port": 8080},
    "tags": ["web", "api"],
}

API

Development

git clone https://github.com/javirm3/marimo-toml-editor
cd marimo-toml-editor
uv run marimo edit examples/demo.py

License

MIT