How to Extract Design Tokens from a Website

What are Design Tokens?

Design tokens are the atomic, platform-agnostic values that make up a design system. Instead of hardcoding a hex value like #FF0000 throughout an application, a developer assigns that value to a token, such as --color-brand-primary.

This abstraction ensures consistency. If the brand color changes, you update the token in one place, and it propagates across web, iOS, and Android platforms instantly.

The Interoperability Problem

While tokens are powerful, moving them between a live production website and a design tool (like Figma) is notoriously difficult. Manually typing hex codes and font sizes from a browser inspector into Figma is prone to human error and wastes valuable design hours.

The Extraction Workflow

To programmatically extract tokens, you must target the CSS Custom Properties.

1. Modern websites usually define their tokens on the :root pseudo-class in CSS.
2. An extraction tool scans the document's stylesheets (document.styleSheets) to locate these root definitions.
3. It parses the CSS rules, extracting the key-value pairs (e.g., --spacing-md: 16px;).
4. The tool then formats this raw data into a structured format.

Exporting for Figma and Code

The true power of token extraction lies in the export formatting. A high-quality tool will provide two primary outputs:

• Raw JSON (W3C Standard): This format can be directly imported into Figma plugins (like Tokens Studio) or processed via tools like Amazon's Style Dictionary.
• CSS Variables: A clean variables.css file that you can immediately drop into your next frontend web project to perfectly replicate the target site's foundational styling.