Check if a value is an Error instance.

This is like value instanceof Error except it works across realms, such as
iframes or Node.js vm.

Example

``js
import isErrorInstance from 'is-error-instance'

isErrorInstance(new Error('')) // true
isErrorInstance('') // false

const CrossRealmError = vm.runInNewContext('Error')
isErrorInstance(new CrossRealmError('')) // true

isErrorInstance(new TypeError('')) // true
isErrorInstance(new AnyOtherError('')) // true

isErrorInstance(new DOMException('')) // true
isErrorInstance(new DOMError('')) // true

isErrorInstance(new Proxy(new Error(''), {})) // true
isErrorInstance(
new Proxy(new Error(''), {
getPrototypeOf: () => {
throw new Error('')
},
}),
) // false
`

Install

`bash
npm install is-error-instance
`

This package works in both Node.js >=18.18.0 and
browsers.

This is an ES module. It must be loaded using
an import or import() statement,
not require(). If TypeScript is used, it must be configured to
output ES modules,
not CommonJS.

API

isErrorInstance(value)

value any\
_Return value_: boolean

Related projects

- modern-errors: Handle errors in
a simple, stable, consistent way
- error-custom-class: Create
one error class
- error-class-utils: Utilities
to properly create error classes
- error-serializer: Convert
errors to/from plain objects
- merge-error-cause: Merge an
error with its cause
- normalize-exception:
Normalize exceptions/errors
- set-error-class: Properly
update an error's class
- set-error-message: Properly
update an error's message
- wrap-error-message:
Properly wrap an error's message
- set-error-props: Properly
update an error's properties
- set-error-stack: Properly
update an error's stack
- error-cause-polyfill:
Polyfill error.cause
- handle-cli-error: 💣 Error
handler for CLI applications 💥
- log-process-errors: Show
some ❤ to Node.js process errors
- error-http-response:
Create HTTP error responses
- winston-error-format: Log
errors with Winston

Support

For any question, _don't hesitate_ to submit an issue on GitHub.

Everyone is welcome regardless of personal background. We enforce a
Code of conduct in order to promote a positive and
inclusive environment.

Contributing

This project was made with ❤️. The simplest way to give back is by starring and
sharing it online.

If the documentation is unclear or has a typo, please click on the page's Edit`
button (pencil icon) and suggest a correction.

If you would like to help us fix a bug or add a new feature, please check our
guidelines. Pull requests are welcome!