ADVANCED // CUSTOM API
MODULE 03 // PROCESSING

Request Transformation.

Transform incoming requests to match ABIS expectations and responses to match client needs.

TRANSFORMATION PATTERNS

Custom APIs often need to transform data between client format and ABIS format. Request transformation maps client fields to ABIS parameters; response transformation shapes ABIS output for clients.

Design transformations as composable functions. Each transformation handles one concern: field mapping, type conversion, validation, or enrichment. Compose these for complex transformations.

Handle transformation errors gracefully. Invalid input should return clear error messages indicating what's wrong and how to fix it—not generic 500 errors.

FIELD MAPPING

Map client field names to ABIS field names. Handle naming convention differences.

STRUCTURE

TYPE CONVERSION

Convert between data types: strings to dates, numbers to enums, nested to flat.

FORMAT

ENRICHMENT

Add derived fields: timestamps, request IDs, computed values from other fields.

AUGMENT

FILTERING

Remove sensitive fields from responses. Apply field-level access control.

SECURITY
KNOWLEDGE CHECK // Q03
Why should transformations be implemented as composable functions?