The new Go JSON API: twice as fast, or 1.5x slower?
Summary
The article benchmarks Go's JSON parsing and marshaling performance across three configurations: the legacy encoding/json, the Go 1.27 updated json, and the new json/v2. It reports results using three datasets (twitter.json, canada.json, citm_catalog.json) and notes that unmarshalling speeds improve with json/v2 while marshalling gains vary. The post concludes that upgrading to json/v2 can boost performance, though outcomes depend on data shape and whether you target typed structs or generic any.