JavaScript isError() Method
Description
The Error.isError()
method returns true
if a passed value is an Error.
Otherwise it returns false
.
All these returns false
.
- Error.isError(5);
- Error.isError(-5);
- Error.isError("Hello");
- Error.isError("Error");
- Error.isError({});
- Error.isError([]);
- Error.isError(true);
- Error.isError(false);
- Error.isError();
- Error.isError(null);
- Error.isError(undefined);
Syntax
Error.isError(value)
Parameters
Parameter | Description |
value | Optional. A value. |
Return Value
Type | Description |
Boolean | true if the value is an Error.Otherwise it returns false .
|
Browser Support
Error.isError()
is proposal for JavaScript.
Since it has reached Stage 4, we can expect it to be part of an upcoming ECMAScript edition (likely ES2026).