Package Exports

is-error-instance

Readme

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

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

npm install is-error-instance

This package works in both Node.js >=14.18.0 and browsers. It is an ES module and must be loaded using an import or import() statement, not require().

API

isErrorInstance(value)

value any
Return value: boolean

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

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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!

is-error-instance