The plain-English version
An agreed structure and meaning for values crossing a boundary between software parts.
Why it matters
It coordinates form inputs, request validation, stored records, and response handling.
Let’s make it click
Both client and server agree that dueDate is either an ISO calendar date or null.
Vibe Bro’s heads-up
Matching field names is insufficient when the two sides interpret units, time zones, or missing values differently.
The docs behind it
Documentation links checked .
Editorial review · October 28, 2026
Supported: OpenAPI documents request/response schemas and data types. The calendar-date/nullability example illustrates an explicit contract rather than a universal encoding rule.