Output and records

form0-core exposes two primary outputs:

• Engine state (values, errors, visible, required, read_only)
• Structured records for persistence (createStructuredRecord)

Engine state

After engine.eval(), call engine.getState() to access the latest state.

Structured record output

createStructuredRecord transforms engine state into a submission-friendly format:

• form_values uses field keys by default
• Repeatable sections become arrays of child records
• Sections are omitted (containers only)

Field key mode

You can switch to data_name keys by using fieldKeyMode:

Code
const record = createStructuredRecord(state, fields, {
  fieldKeyMode: "data-name",
})

Repeatable sections

Repeatable sections create nested records. Use originalElements to preserve the correct nesting structure when building records.