# @bugsnag/core

> Core classes and utilities for Bugsnag notifiers

Latest version **8.9.0** (published 2026-04-08) · MIT license · 0 weekly downloads

## Install

```sh
npm install @bugsnag/core
pnpm add @bugsnag/core
yarn add @bugsnag/core
bun add @bugsnag/core
```

## Health

**Score 55/100 (C)** — status: active.

Positive: has types; no vulnerabilities; high maintenance score.

Warnings: low downloads; no esm support.

## Facts

| | |
|---|---|
| Version | 8.9.0 |
| Published | 2026-04-08 |
| First published | 2018-09-17 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | bundled |
| Module format | CommonJS |
| Dependencies | 5 |
| Unpacked size | 87.9 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 893 |
| Author | Bugsnag |
| Maintainers | foygl, tomlongridge, twometresteve, ahmed_bugsnag, gingerbenw, joshedney, sb-gulshans, smartbear_devops, sb_shyamnandlagishetti, sb-gaurava, sb-jigneshr, sb-priyankap |

## Links

- npm: https://www.npmjs.com/package/@bugsnag/core
- Repository: git@github.com:bugsnag/bugsnag-js
- Homepage: https://www.bugsnag.com/
- npm.io page: https://npm.io/package/@bugsnag/core

## Dependencies (5)

- [iserror](https://npm.io/package/iserror.md) ^0.0.2
- [@bugsnag/cuid](https://npm.io/package/@bugsnag/cuid.md) ^3.2.1
- [stack-generator](https://npm.io/package/stack-generator.md) ^2.0.3
- [error-stack-parser](https://npm.io/package/error-stack-parser.md) ^2.0.3
- [@bugsnag/safe-json-stringify](https://npm.io/package/@bugsnag/safe-json-stringify.md) ^6.0.0

## Recent versions

- 8.9.0 (latest) — 2026-04-08
- 8.0.0-alpha.13 (next) — 2024-08-05
- 6.2.0-alpha.1 (alpha) — 2019-04-12
- 7.0.0-pre-alpha-ben.6 (pre-alpha-ben) — 2019-04-09
- 8.8.0 — 2026-01-20
- 8.6.0 — 2025-09-25
- 8.4.0 — 2025-06-18
- 8.2.0 — 2025-01-27
- 8.1.1 — 2024-10-23
- 8.1.0 — 2024-10-23
- 8.0.0 — 2024-08-29
- 8.0.0-alpha.12 — 2024-07-31
- 8.0.0-alpha.11 — 2024-07-26
- 8.0.0-alpha.10 — 2024-07-16
- 7.25.0 — 2024-07-03
- … 94 more at https://npm.io/package/@bugsnag/core/versions

## README

# @bugsnag/core

This package contains the core classes and utilities common to the Bugsnag notifier for any JS-based platform:

- `Client` class
- `Event` class
- `Breadcrumb` class
- `Session` class
- `config` scheme and utils
- Basic JS polyfills that don't pollute the global scope (for support back to IE8)
- and a couple of other small utilities

Unless you are writing your own notifier, it is unlikely that you want to install this module – for the universal error reporting client, see [@bugsnag/js](../js).

## License

This package is free software released under the MIT License. See [LICENSE.txt](./LICENSE.txt) for details.

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_Source: https://npm.io/package/@bugsnag/core · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._