Go Library Checker Adds RFC 9457 Problem Details Support for Validation Errors

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The Go validation library Checker has introduced a ProblemDetails() method that converts struct-tag validation failures into RFC 9457-compliant 'application/problem+json' responses. RFC 9457, an IETF standard for HTTP API error reporting, defines a structured body with fields like type, title, status, and an invalid-params array detailing which fields failed and why. Previously, Go APIs typically returned custom, inconsistent error shapes that clients had to learn individually from documentation. With a single method call on a CheckErrors value, developers can now produce a standards-compliant error response with sensible defaults, including HTTP 400 status and machine-readable error codes. The method also supports localization across 23 languages and allows overriding default fields such as type, title, and status before marshaling.

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