I don't think "encoding/json" is fully working yet. Seems to be importable now, although tests are not passing. See supported packages here: https://tinygo.org

I don't think "encoding/json" is fully working yet. Seems to be importable now, although tests are not passing. See supported packages here: https://tinygo.org/docs/reference/lang-support/stdlib/ https://tinygo.org/docs/reference/lang-support/stdlib/ Definitely still a ways to go before the full stdlib is usable. Looks like your code still fails at runtime with the error: panic: unimplemented: (reflect.Type).NumMethod() Tested here: https://play.tinygo.org/ https://play.tinygo.org/