{"id":16208484,"url":"https://github.com/ehmicky/is-error-instance","last_synced_at":"2025-06-15T06:33:04.491Z","repository":{"id":61517827,"uuid":"550891028","full_name":"ehmicky/is-error-instance","owner":"ehmicky","description":"Check if a value is an `Error` 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size](https://img.shields.io/bundlephobia/minzip/is-error-instance?label\u0026colorA=404040\u0026colorB=808080\u0026logo=webpack)](https://bundlephobia.com/package/is-error-instance)\n[![Mastodon](https://img.shields.io/badge/-Mastodon-808080.svg?logo=mastodon\u0026colorA=404040\u0026logoColor=9590F9)](https://fosstodon.org/@ehmicky)\n[![Medium](https://img.shields.io/badge/-Medium-808080.svg?logo=medium\u0026colorA=404040)](https://medium.com/@ehmicky)\n\nCheck if a value is an `Error` instance.\n\nThis is like `value instanceof Error` except it works across realms, such as\niframes or Node.js [`vm`](https://nodejs.org/api/vm.html).\n\n# Example\n\n\u003c!-- eslint-disable fp/no-proxy --\u003e\n\n```js\nimport isErrorInstance from 'is-error-instance'\n\nisErrorInstance(new Error('')) // true\nisErrorInstance('') // false\n\nconst CrossRealmError = vm.runInNewContext('Error')\nisErrorInstance(new CrossRealmError('')) // true\n\nisErrorInstance(new TypeError('')) // true\nisErrorInstance(new AnyOtherError('')) // true\n\nisErrorInstance(new DOMException('')) // true\nisErrorInstance(new DOMError('')) // true\n\nisErrorInstance(new Proxy(new Error(''), {})) // true\nisErrorInstance(\n  new Proxy(new Error(''), {\n    getPrototypeOf: () =\u003e {\n      throw new Error('')\n    },\n  }),\n) // false\n```\n\n# Install\n\n```bash\nnpm install is-error-instance\n```\n\nThis package works in both Node.js \u003e=18.18.0 and\n[browsers](https://raw.githubusercontent.com/ehmicky/dev-tasks/main/src/browserslist).\n\nThis is an ES module. It must be loaded using\n[an `import` or `import()` statement](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c),\nnot `require()`. If TypeScript is used, it must be configured to\n[output ES modules](https://www.typescriptlang.org/docs/handbook/esm-node.html),\nnot CommonJS.\n\n# API\n\n## isErrorInstance(value)\n\n`value` `any`\\\n_Return value_: `boolean`\n\n# Related projects\n\n- [`modern-errors`](https://github.com/ehmicky/modern-errors): Handle errors in\n  a simple, stable, consistent way\n- [`error-custom-class`](https://github.com/ehmicky/error-custom-class): Create\n  one error class\n- [`error-class-utils`](https://github.com/ehmicky/error-class-utils): Utilities\n  to properly create error classes\n- [`error-serializer`](https://github.com/ehmicky/error-serializer): Convert\n  errors to/from plain objects\n- [`merge-error-cause`](https://github.com/ehmicky/merge-error-cause): Merge an\n  error with its `cause`\n- [`normalize-exception`](https://github.com/ehmicky/normalize-exception):\n  Normalize exceptions/errors\n- [`set-error-class`](https://github.com/ehmicky/set-error-class): Properly\n  update an error's class\n- [`set-error-message`](https://github.com/ehmicky/set-error-message): Properly\n  update an error's message\n- [`wrap-error-message`](https://github.com/ehmicky/wrap-error-message):\n  Properly wrap an error's message\n- [`set-error-props`](https://github.com/ehmicky/set-error-props): Properly\n  update an error's properties\n- [`set-error-stack`](https://github.com/ehmicky/set-error-stack): Properly\n  update an error's stack\n- [`error-cause-polyfill`](https://github.com/ehmicky/error-cause-polyfill):\n  Polyfill `error.cause`\n- [`handle-cli-error`](https://github.com/ehmicky/handle-cli-error): 💣 Error\n  handler for CLI applications 💥\n- [`beautiful-error`](https://github.com/ehmicky/beautiful-error): Prettify\n  error messages and stacks\n- [`log-process-errors`](https://github.com/ehmicky/log-process-errors): Show\n  some ❤ to Node.js process errors\n- [`error-http-response`](https://github.com/ehmicky/error-http-response):\n  Create HTTP error responses\n- [`winston-error-format`](https://github.com/ehmicky/winston-error-format): Log\n  errors with Winston\n\n# Support\n\nFor any question, _don't hesitate_ to [submit an issue on GitHub](../../issues).\n\nEveryone is welcome regardless of personal background. We enforce a\n[Code of conduct](CODE_OF_CONDUCT.md) in order to promote a positive and\ninclusive environment.\n\n# Contributing\n\nThis project was made with ❤️. The simplest way to give back is by starring and\nsharing it online.\n\nIf the documentation is unclear or has a typo, please click on the page's `Edit`\nbutton (pencil icon) and suggest a correction.\n\nIf you would like to help us fix a bug or add a new feature, please check our\n[guidelines](CONTRIBUTING.md). Pull requests are welcome!\n\n\u003c!-- Thanks go to our wonderful contributors: --\u003e\n\n\u003c!-- ALL-CONTRIBUTORS-LIST:START --\u003e\n\u003c!-- prettier-ignore --\u003e\n\u003c!--\n\u003ctable\u003e\u003ctr\u003e\u003ctd align=\"center\"\u003e\u003ca href=\"https://fosstodon.org/@ehmicky\"\u003e\u003cimg src=\"https://avatars2.githubusercontent.com/u/8136211?v=4\" width=\"100px;\" alt=\"ehmicky\"/\u003e\u003cbr /\u003e\u003csub\u003e\u003cb\u003eehmicky\u003c/b\u003e\u003c/sub\u003e\u003c/a\u003e\u003cbr /\u003e\u003ca href=\"https://github.com/ehmicky/is-error-instance/commits?author=ehmicky\" title=\"Code\"\u003e💻\u003c/a\u003e \u003ca href=\"#design-ehmicky\" title=\"Design\"\u003e🎨\u003c/a\u003e \u003ca href=\"#ideas-ehmicky\" title=\"Ideas, Planning, \u0026 Feedback\"\u003e🤔\u003c/a\u003e \u003ca href=\"https://github.com/ehmicky/is-error-instance/commits?author=ehmicky\" title=\"Documentation\"\u003e📖\u003c/a\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/table\u003e\n --\u003e\n\u003c!-- ALL-CONTRIBUTORS-LIST:END --\u003e\n","funding_links":[],"categories":[],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fehmicky%2Fis-error-instance","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fehmicky%2Fis-error-instance","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fehmicky%2Fis-error-instance/lists"}