modern-errors plugin to create HTTP error responses.

This adds BaseError.httpResponse(error) which converts error to a plain object (RFC 7807, "problem details") to use in an HTTP response.

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Example

Adding the plugin to modern-errors.

import ModernError from 'modern-errors'

import modernErrorsHttp from 'modern-errors-http'

export const BaseError = ModernError.subclass('BaseError', {
  plugins: [modernErrorsHttp],
})

Configuring error fields.

export const AuthError = BaseError.subclass('AuthError', {
  http: {
    type: 'https://example.com/probs/auth',
    status: 401,
  },
})

Creating an HTTP error response.

const error = new AuthError('Could not authenticate.', {
  http: {
    instance: '/users/62',
    extra: { userId: 62 },
  },
})
const object = BaseError.httpResponse(error)
// {
//   type: 'https://example.com/probs/auth',
//   status: 401,
//   title: 'AuthError',
//   detail: 'Could not authenticate.',
//   instance: '/users/62',
//   stack: `AuthError: Could not authenticate.
//     at ...`,
//   extra: { userId: 62 },
// }

Install

npm install modern-errors-http

This package works in both Node.js >=18.18.0 and browsers.

This is an ES module. It must be loaded using an import or import() statement, not require(). If TypeScript is used, it must be configured to output ES modules, not CommonJS.

API

modernErrorsHttp

Type: Plugin

Plugin object to pass to the plugins option of ErrorClass.subclass().

BaseError.httpResponse(error)

error: Error
Return value: HttpResponse

Converts error to a plain object to use in an HTTP response. Its shape follows RFC 7807 ("problem details").

Options

Type: object

type

Type: urlString
Default: undefined

URI identifying and documenting the error class. Ideally, each error class should set one.

status

Type: integer
Default: undefined

HTTP status code.

title

Type: string
Default: error.name

Error class name.

detail

Type: string
Default: error.message

Error description.

instance

Type: urlString
Default: undefined

URI identifying the value which errored.

stack

Type: string
Default: error.stack

Error stack trace. Can be set to an empty string.

extra

Type: object
Default: any additional error properties

Additional information. This is always safe to serialize as JSON. Can be set to an empty object.

Configuration

Options can apply to (in priority order):

• Any error: second argument to ModernError.subclass()

export const BaseError = ModernError.subclass('BaseError', {
  plugins: [modernErrorsHttp],
  http: options,
})

• Any error of a specific class (and its subclasses): second argument to ErrorClass.subclass()

export const AuthError = BaseError.subclass('AuthError', { http: options })

• A specific error: second argument to new ErrorClass()

throw new AuthError('...', { http: options })

• A specific BaseError.httpResponse(error) call

BaseError.httpResponse(error, options)

Related projects

• error-http-response: Create HTTP error responses
• safe-json-value: ⛑️ JSON serialization should never fail
• modern-errors: Handle errors in a simple, stable, consistent way
• modern-errors-cli: Handle errors in CLI modules
• modern-errors-process: Handle process errors
• modern-errors-bugs: Print where to report bugs
• modern-errors-serialize: Serialize/parse errors
• modern-errors-clean: Clean stack traces
• modern-errors-winston: Log errors with Winston
• modern-errors-switch: Execute class-specific logic

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

This project was made with ❤️. The simplest way to give back is by starring and sharing it online.

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!