Web platform features explorer

The Error.isError() static method checks whether a value is an Error object.

Status

Limited availability

MDN documentation

Error.isError()

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 (8 months)

Usage (according to Chrome Platform Status)

~1.080% of page loads. More data at chromestatus.com.

Developer signals

Votes: 2

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