How do you optimize JSON serialization in Go?

Standard encoding/json relies heavily on reflection. For high performance, use code generation tools or faster libraries.

Reflection determines struct fields at runtime, which is CPU intensive. Libraries like easyjson or ffjson analyze structs at compile-time and generate static marshal/unmarshal methods. Modern drop-in replacements like goccy/go-json or json-iterator/go utilize advanced parsing algorithms and unsafe pointers to match generated speeds without external build steps.