Kedro-Viz

Kedro-Viz shows you how your Kedro data pipelines are structured.

With Kedro-Viz you can:

• See how your datasets and Python functions (nodes) are resolved in Kedro so that you can understand how your data pipeline is built
• Get a clear picture when you have lots of datasets and nodes by using tags to visualise sub-pipelines
• Search for nodes and datasets

This project was bootstrapped with Create React App, for which more complete documentation is available on the project website.

How do I install and use Kedro-Viz?

For in-depth development and usage notes, see the Contribution Guidelines.

As a Kedro Python plugin

Kedro-Viz is available as a Python plugin named kedro-viz.

The following conditions must be true in order to visualise your pipeline:

• Your project directory must be available to the Kedro-Viz plugin.
• You must be using a Kedro project structure with a complete Data Catalog, nodes and pipeline structure.

To install it:

pip install kedro-viz

This will install kedro as a dependency, and add kedro viz as an additional CLI command.

To visualise your pipeline, go to your project root directory and install the project-specific dependencies by running:

kedro install

This will install the dependencies specified in requirements.txt in your Kedro environment (see the Kedro documentation for how to set up your Python virtual environment).

Finally, run the following command from the project directory to visualise your pipeline:

kedro viz

This command will run kedro_viz.server on http://127.0.0.1:4141/ which cannot be accessed from another machine.

Kedro-Viz has a number of options to customise running the visualisation:

CLI command	Description
--host	Host that viz will listen to. Defaults to 127.0.0.1.
--port	TCP port that viz will listen to. Defaults to 4141.
--browser/--no-browser	Whether to open viz interface in the default browser or not.
--load-file	Path to load the pipeline JSON file
--save-file	Path to save the pipeline JSON file
--pipeline	Name of the modular pipeline to visualise. If not set, the default pipeline is visualised.
--env, -e	Kedro configuration environment. If not specified, catalog config in local will be used.

As a JavaScript React component

Kedro-Viz is also available as an npm package named @quantumblack/kedro-viz. To install it:

npm install @quantumblack/kedro-viz

Then include it in your React application:

import KedroViz from '@quantumblack/kedro-viz';

const MyApp = () => <KedroViz data={json} />;

As a JavaScript React component, the project is designed to be used in two different ways:

1. Standalone application

   Run npm run build to generate a production build as a full-page app. The built app will be placed in the /build directory. Data for the chart should be placed in /public/api/main because this directory is marked gitignore.

2. React component

   Kedro-Viz can be used as a React component that can be imported into other applications. Publishing the package will run npm run lib, which compiles the source code in /src, and places it in the /lib directory.

   The React component exposes props that can be used to supply data and customise its behaviour. For information about the props, their expected prop-types and default values, see /src/components/app/index.js. For examples of the expected data input format, see the mock data examples in /src/utils/data, and compare the resulting demo.

Flags

The following flags are available to toggle experimental features:

• newgraph - From release v3.4.0. Improved graphing algorithm. (default false)
• meta - From release v3.7.0. Show node metadata panel on click. (default false)

Setting flags

To enable or disable a flagged feature, add the flag as a parameter with the value true or false to the end of the URL in your browser when running Kedro-Viz, e.g.

http://localhost:4141/?data=demo&newgraph=true

The setting you provide persists for all sessions on your machine, until you change it.

Viewing flags

Kedro-Viz will log a message in your browser's developer console regarding the available flags and their values as currently set on your machine.

What licence do you use?

Kedro-Viz is licensed under the Apache 2.0 License.

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