Transformers

Transformers are middleware for validating, enriching, and redacting events in the walkerOS pipeline. Together with Mapping, they give you full control over how events are shaped before reaching destinations.

Use cases

Use Case	Example
Validate	Ensure events match JSON Schema contracts
Enrich	Add server-side data (user segments, geo)
Redact	Remove PII before sending to destinations

Basic setup

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Available transformers

Validator

Validates events using JSON Schema:

• Format validation (WalkerOS.Event structure)
• Contract validation (entity/action business rules)
• Configurable logging for validation results

Learn more →

Configuration

These fields are available on every transformer, regardless of package. They wrap the package-specific settings field, which is documented on each transformer's page.

Property	Type	Description	More
env	any	Environment dependencies (platform-specific)
id	string	Transformer instance identifier (defaults to transformer key)
logger	object	Logger configuration (level, handler) to override the collector defaults
before	__schema0	Pre-transformer chain that runs before this transformer pushes
next	__schema0	Graph wiring to the next transformer in the chain
cache	object	Step-level cache configuration for this transformer
disabled	boolean	Completely skip this transformer in chains

Next steps

• Validator - JSON Schema validation
• Create your own - Custom transformer guide