Validation

Full-Form Validation

Rule strategy, nullish behavior, and submit flow guarantees.

Validation strategy

deterministic rules generated by field type
rules(...) appends custom rules
replaceRules(...) replaces generated rules
effective schema is resolved before payload validation

Nullish behavior depends on required:

required: false treats null or empty string as absent
required: true rejects null or empty string

Unknown fields

validation.reject_unknown_fields controls unknown key handling in full submit flow:

true: unknown keys are rejected
false: unknown keys are ignored before persistence

Submission lifecycle

fetch latest or requested version
resolve condition-aware effective schema
validate payload server-side
persist submission
run automations (sync or queued, if registered)

Validation Overview

Validation flows for full form submit, single field checks, partial subsets, and localization.

Single-Field Validation

Validate one field without creating a submission.