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Definition
error.param appears in the error envelope whenever a failure is about one specific input. On a 422, it points straight at the offending field — fields.consent, fields.email — so you can highlight it in your form. When an error is not field-specific (a rate limit, a server error) it is absent.
Frequently asked questions
Is error.param always present?
No — only on field-validation errors. Rate limits and server errors have no single offending field, so they omit it.
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