# level-errors > Error types for [levelup][levelup]. [![level badge][level-badge]](https://github.com/Level/awesome) [![npm](https://img.shields.io/npm/v/level-errors.svg?label=&logo=npm)](https://www.npmjs.com/package/level-errors) [![Node version](https://img.shields.io/node/v/level-errors.svg)](https://www.npmjs.com/package/level-errors) [![Travis](https://img.shields.io/travis/Level/errors.svg?logo=travis&label=)](https://travis-ci.org/Level/errors) [![Coverage Status](https://coveralls.io/repos/github/Level/errors/badge.svg)](https://coveralls.io/github/Level/errors) [![JavaScript Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://standardjs.com) [![npm](https://img.shields.io/npm/dm/level-errors.svg?label=dl)](https://www.npmjs.com/package/level-errors) [![Backers on Open Collective](https://opencollective.com/level/backers/badge.svg?color=orange)](#backers) [![Sponsors on Open Collective](https://opencollective.com/level/sponsors/badge.svg?color=orange)](#sponsors) ## API **If you are upgrading:** please see [`UPGRADING.md`](UPGRADING.md). ### `.LevelUPError()` Generic error base class. ### `.InitializationError()` Error initializing the database, like when the database's location argument is missing. ### `.OpenError()` Error opening the database. ### `.ReadError()` Error reading from the database. ### `.WriteError()` Error writing to the database. ### `.NotFoundError()` Data not found error. Has extra properties: - `notFound`: `true` - `status`: 404 ### `.EncodingError()` Error encoding data. ## Contributing [`Level/errors`](https://github.com/Level/errors) is an **OPEN Open Source Project**. This means that: > Individuals making significant and valuable contributions are given commit-access to the project to contribute as they see fit. This project is more like an open wiki than a standard guarded open source project. See the [Contribution Guide](https://github.com/Level/community/blob/master/CONTRIBUTING.md) for more details. ## Donate To sustain [`Level`](https://github.com/Level) and its activities, become a backer or sponsor on [Open Collective](https://opencollective.com/level). Your logo or avatar will be displayed on our 28+ [GitHub repositories](https://github.com/Level), [npm](https://www.npmjs.com/) packages and (soon) [our website](http://leveldb.org). 💖 ### Backers [![Open Collective backers](https://opencollective.com/level/backers.svg?width=890)](https://opencollective.com/level) ### Sponsors [![Open Collective sponsors](https://opencollective.com/level/sponsors.svg?width=890)](https://opencollective.com/level) ## License [MIT](LICENSE.md) © 2012-present [Contributors](CONTRIBUTORS.md). [level-badge]: http://leveldb.org/img/badge.svg [levelup]: https://github.com/Level/levelup