Mapping configuration for interpreting HTTP responses as validation results.

Expressions in validWhen and errorParams are evaluated with scope { response } only — they do NOT have access to formValue, fieldValue, or the full EvaluationContext. This is intentional for v1: response mapping is purely about interpreting the HTTP response.

Properties

Name Type Description

errorKind

string

Error kind returned when validation fails — maps to field-level validationMessages

errorParams

Record<string, string> | undefined

Parameters to include in the validation error for message interpolation. Map of parameter names to expressions evaluated against { response }.

validWhen

string

Expression evaluated with scope { response }. Must evaluate to true (strict boolean) to be valid.

NOTE: This is the OPPOSITE of the function-based HttpCustomValidator.onSuccess convention, which maps successful HTTP responses to validation errors. Here, === true means "validation passed". Non-boolean results are treated as invalid and trigger a warning.