ECMAScript 2025 JavaScript standard approved

ECMAScript 2025, the latest version of the ECMA International standard for JavaScript, has been officially approved. The specification standardizes new JavaScript capabilities including JSON modules, import attributes, new Set methods, sync iterator helpers, and regular expression modifiers.

The ECMAScript 2025 specification was finalized by ECMA International on June 25. All told, nine finished proposals on the ECMAScript development committee’s GitHub page were approved. Another proposal slated for 2025, for time duration formatting objects, appears on a different page. Development of ECMAScript is under the jurisdiction of the ECMA International Technical Committee 39 (TC39).

Note that many new JavaScript features appear in browsers even before new ECMAScript standards are approved. “One thing to note is that the vast majority of web developers are more attentive when these various features become available in their favorite browser or runtime as opposed to it being added to the JS spec, which happens afterwards,” said Ujjwal Sharma, co-chair of TC39 and co-editor of ECMA-402, the ECMAScript internationalization API specification.