I’m excited to announce the release of Design Token Validator, a free tool that helps teams ensure their design tokens comply with the W3C Design Tokens Community Group specification.
What Are Design Tokens?
Design tokens are the visual design atoms of a design system — specifically, they are named entities that store visual design attributes. They’re the building blocks of your design system: colors, typography, spacing, shadows, and more. By defining these values as tokens, teams can maintain consistency across products, platforms, and codebases.
Why Validation Matters
As design systems grow and evolve, maintaining token consistency becomes increasingly challenging. Without proper validation, teams often encounter:
- Inconsistent token formats across different tools and platforms
- Breaking changes when tokens are updated or refactored
- Interoperability issues when sharing tokens between design and development tools
- Specification drift as new team members add tokens without following established patterns
The W3C Design Tokens Community Group has created a standardized format specification that addresses these challenges. By validating tokens against this spec, you ensure that your design tokens are portable, predictable, and future-proof.
Key Features
Design Token Validator provides comprehensive validation capabilities:
- W3C Spec Compliance: Validates token structure, types, and values against the latest W3C specification
- Type Checking: Ensures colors, dimensions, fonts, and other token types follow correct formats
- Reference Validation: Verifies that token aliases and references resolve correctly
- Group Validation: Checks token group structures and hierarchies
- Detailed Error Reports: Provides clear, actionable feedback on validation failures
- Free and Open Source: No licensing fees, no usage limits
How It Works
The validator analyzes your design token JSON files and checks them against the W3C specification rules. It examines:
- Token structure - Ensuring proper nesting and organization
- Type definitions - Validating that each token has a correct
$typedeclaration - Value formats - Checking that values match their declared types
- References - Verifying that aliased tokens point to valid sources
- Metadata - Validating descriptions, extensions, and other metadata
Getting Started
Try it free at designtoken-validator.sotec-solutions.com.
