Lowercase Transformation Reference

A builder for creating TransformationSettings that configure a Lowercase transformer.

Use lowercaseAllVariables() to lowercase every string value in the dispatch payload, or lowercaseVariables(_:) to target specific keys. When neither method is called the transformation is a no-op (the dispatch passes through unchanged).

All-variables mode — string values inside arrays and nested dictionaries are lowercased recursively. Non-string values (e.g. numbers, booleans) are preserved as-is. The visitor ID (tealium_visitor_id), CP trace ID (cp.trace_id), and Tealium trace ID (tealium_trace_id) are always preserved, unless they are explicitly listed via lowercaseVariables(_:).

Specific-variables mode — only the values at the specified paths are lowercased. String values are lowercased directly; arrays and dictionaries are descended recursively and their string elements are lowercased. Non-string scalar values (e.g. numbers, booleans) are left unchanged. The excluded keys above are not automatically protected; listing them in lowercaseVariables(_:) will lowercase them.

Example:

// Lowercase everything
let settings = LowercaseSettingsBuilder(id: "my-lower")
    .lowercaseAllVariables()
    .build()

// Lowercase only specific keys
let settings = LowercaseSettingsBuilder(id: "my-lower")
    .lowercaseVariables([.key("user_name"), .key("email")])
    .build()

See more

public class LowercaseSettingsBuilder : TransformationSettingsBuilder