makeerror
Advanced tools
Package description
The makeerror npm package provides a simple way to create custom error types in JavaScript. It allows developers to define new error types with specific properties and methods, enhancing error handling in applications by making it more structured and informative.
Creating custom error types
This feature allows developers to create new error types. The example shows how to define a custom error type named 'MyError' and create an instance of it with a specific message.
const makeError = require('makeerror');
const MyError = makeError('MyError');
const errorInstance = new MyError('Something went wrong!');
console.log(errorInstance.name); // 'MyError'
console.log(errorInstance.message); // 'Something went wrong!'Custom error with additional properties
This feature demonstrates how to add additional properties to a custom error type. In the example, a 'statusCode' property is added to the 'MyError' type, which can be useful for HTTP error handling.
const makeError = require('makeerror');
const MyError = makeError('MyError', { statusCode: 404 });
const errorInstance = new MyError('Not found');
console.log(errorInstance.statusCode); // 404The verror package provides a way to create rich JavaScript errors, which can include multiple error causes, formatted messages, and other metadata. It is more feature-rich compared to makeerror, offering advanced error chaining and customization options.
This package is specifically designed to generate HTTP errors for Node.js applications. Unlike makeerror, which is general-purpose, http-errors focuses on HTTP status codes and messages, making it ideal for web server development.
Readme
A library to make errors.
Makes an Error constructor function with the signature below. All arguments are
optional, and if the first argument is not a String, it will be assumed to be
data:
function(message, data)
You'll typically do something like:
var makeError = require('makeerror')
var UnknownFileTypeError = makeError(
'UnknownFileTypeError',
'The specified type is not known.'
)
var er = UnknownFileTypeError()
er will have a prototype chain that ensures:
er instanceof UnknownFileTypeError
er instanceof Error
There is support for simple string substitutions like:
var makeError = require('makeerror')
var UnknownFileTypeError = makeError(
'UnknownFileTypeError',
'The specified type "{type}" is not known.'
)
var er = UnknownFileTypeError({ type: 'bmp' })
Now er.message or er.toString() will return 'The specified type "bmp" is not known.'.
You can create simple hierarchies as well using the prototype chain:
var makeError = require('makeerror')
var ParentError = makeError('ParentError')
var ChildError = makeError(
'ChildError',
'The child error.',
{ proto: ParentError() }
)
var er = ChildError()
er will have a prototype chain that ensures:
er instanceof ChildError
er instanceof ParentError
er instanceof Error
FAQs
A library to make errors.
The npm package makeerror receives a total of 17,221,733 weekly downloads. As such, makeerror popularity was classified as popular.
We found that makeerror demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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