Recursive PII Masking in DataWeave: One Function...

A compliance audit found SSN values 4 levels deep in our API responses last year. One recursive function masks everything. Then null values in production crashed 400 responses. TL;DR Recursive maskPII function dispatches on type: Object → check fields, Array → recurse, Primitive → pass through Works at any nesting depth with one function call: maskPII(payload) Null values crash it — add explicit null handling before the Object case No hardcoded paths needed — the function finds PII fields at any