Appendix • ECMAScript • https://ja.wikipedia.org/wiki/ECMAScript • Standard ECMA-262 • https://www.ecma-international.org/publications/standards/Ecma-262.htm • Standard ECMA-404 • https://www.ecma-international.org/publications/standards/Ecma-404.htm • Proposal to make all JSON text valid ECMA-262 • https://github.com/tc39/proposal-json-superset