Error.isError()
The Error.isError() static method checks whether a value is an Error object.
Status
Limited availability
MDN documentation
Specifications
- ECMAScript® 2026 Language Specification (#sec-error.iserror), from TC39 (Ecma International).
Browser support
- Chrome 134 Released on 2025-03-04
- Chrome Android 134 Released on 2025-03-04
- Edge 134 Released on 2025-03-06
- Firefox 138 Released on 2025-04-29
- Firefox for Android 138 Released on 2025-04-29
- Safari ❌
- Safari on iOS ❌
Baseline availability blocked since April 2025 by Safari (4 months)
Usage (according to Chrome Platform Status)
~0.490% of page loads. More data at chromestatus.
View as JSON | Edit this feature | Report an issue | Web-features entry: source, dist