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44 lines
1.7 KiB
44 lines
1.7 KiB
# fastify-error
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[](https://www.npmjs.com/package/fastify-error)
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[](https://snyk.io/test/github/fastify/fastify-error)
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[](https://standardjs.com/)
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A small utility, used by Fastify itself, for generating consistent error objects across your codebase and plugins.
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### Install
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```
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npm i fastify-error
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```
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### Usage
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The module exports a function that you can use for consistent error objects, it takes 4 parameters:
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```
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createError(code, message [, statusCode [, Base]])
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```
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- `code` (`string`, required) - The error code, you can access it later with `error.code`. For consistency, we recommend prefixing plugin error codes with `FST_`
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- `message` (`string`, required) - The error message. You can also use interpolated strings for formatting the message.
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- `statusCode` (`number`, optional) - The status code that Fastify will use if the error is sent via HTTP.
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- `Base` (`Error`, optional) - The base error object that will be used. (eg `TypeError`, `RangeError`)
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```js
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const createError = require('fastify-error')
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const CustomError = createError('ERROR_CODE', 'message')
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console.log(new CustomError())
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```
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How to use an interpolated string:
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```js
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const createError = require('fastify-error')
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const CustomError = createError('ERROR_CODE', 'Hello %s')
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console.log(new CustomError('world')) // error.message => 'Hello world'
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```
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## License
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Licensed under [MIT](./LICENSE).
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