A New Go API for JSON

Go 1.27 introduces stable versions of new JSON packages (encoding/json/v2 and encoding/json/jsontext) designed to address long-standing issues with the original encoding/json standard library package. The new packages fix behavioral flaws including improper handling of invalid UTF-8, acceptance of duplicate object keys, and inconsistent marshaling of nil slices and maps—problems that can cause data corruption, security vulnerabilities, and interoperability issues with other JSON implementations.