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Zod · Method

.passthrough

.passthrough() makes a Zod object keep unknown properties during parsing. In Zod 4, use z.looseObject() for new code.

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Syntax

z.object(shape).passthrough()

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  • z.looseObject()
  • z.strictObject()
  • z.object()
  • parse()

Source: Zod — Defining schemas. Checked 2026-11-03.