The backend is just vanilla Python.

The front end is built using Vue.js. To make modifications, clone the repo, and cd into the admin_ui directory.

Install the npm dependencies:

npm install

And then you can launch the admin as follows:

npm run dev

It will auto refresh the UI as you make changes to the source files.

The UI needs an API to interact with - the easiest way to do this is to use the demo app.


# Or alternatively
python -m piccolo_admin.example

# You can also populate lots of test data
python -m piccolo_admin.example --inflate=10000

# To find out all available options:
python -m piccolo_admin.example --help

Code style


Piccolo uses Black for formatting, preferably with a max line length of 79, to keep it consistent with PEP8 .

You can configure VSCode by modifying settings.json as follows:

    "python.linting.enabled": true,
    "python.formatting.provider": "black",
    "python.formatting.blackArgs": [
    "editor.formatOnSave": true

Type hints are used throughout the project.

Front end

We use VSCode for front end development, as it has the excellent Vetur extension.

Add the following to your VSCode settings.json:

     // Standalone LESS and Typescript files
     "prettier.semi": false,
     "prettier.singleQuote": false,
     "prettier.tabWidth": 4,
     "prettier.trailingComma": "none",

     // Vetur - handles Vue files
     "vetur.format.enable": true,
     "vetur.format.options.tabSize": 4,
     "vetur.format.options.useTabs": false,
     "vetur.format.defaultFormatterOptions": {
         "prettier": {
             "semi": false,
             "singleQuote": false,
             "trailingComma": "none",


The project uses Storybook JS, which is a nice tool for viewing UI components in isolation. To launch it:

npm run storybook


This was temporarily removed in v1, but we will try and add it back.


Playwright is a tool for running end to end tests. It enables us to check that the entire application is working as expected.

Run all tests

From within the root folder, use the following command to run all of the Playwright tests with dev server in parallel:



The Piccolo Admin UI supports translations for several languages. If you would like to contribute a new language, it would be very appreciated.

Look in piccolo_admin/translations/ Use one of the existing translations as a foundation.

We have a script which checks if any translations are missing, which you can use if you like:

python scripts/ validate