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n-custom-errors
Advanced tools
Custom errors for Node.js.
get<errorName>Error()
get<errorName>ErrorType()
is<errorName>Error()
# Add to project
$ npm i n-custom-errors
// Registering errors:
customErrors.registerError('AccessDenied', 403);
customErrors.registerError('DuplicateObject', 409);
customErrors.registerError('ObjectNotFound', 404, '${objectName} not found');
// Creating custom errors:
let objectNotFoundError = customErrors.getObjectNotFoundError({ objectName: 'user' });
let duplicateObjectError = customErrors.getDuplicateObjectError('The email is not unique');
console.log(objectNotFoundError);
/*
prints => {
name: 'ObjectNotFoundError',
message: 'user not found',
statusCode: 404
}*/
console.log(duplicateObjectError);
/*
prints => {
name: 'DuplicateObjectError',
message: 'The email is not unique',
statusCode: 409
}*/
// Checking that an error is a custom error:
let err = new Error();
let objectNotFoundError = customErrors.getObjectNotFoundError({ objectName: 'user' });
customErrors.isObjectNotFoundError(err)); // returns false
customErrors.isObjectNotFoundError(objectNotFoundError)); // returns true
registerError(name, statusCode, messageTemplate)
Registers a new custom error.
name
- error name, required, must be an unique. Name must be without Error
postfix.statusCode
- http status code for error.messageTemplate
- template for a message, must contains parameters in the following format: ${objectName} not found
. To pass the parameters to the template, parameters must be an object with defined properties: customErrors.getObjectNotFoundError({ objectName: 'user' })
. If parameters is a string, than this string will be used in an error message without template: customErrors.getObjectNotFoundError('User with a name user1 not found, please use another filter')
.isKnownError(err)
Returns true
if err
is a registered custom error, false
otherwise.
err
- error object, required.get<errorName>Error(msg)
This function is added automatically when a new custom error is registered.
Creates a custom error with message msg
, it can be the parameters object if an error is registered with messageTemplate
.
msg
- an error message, required.get<errorName>ErrorType()
This function is added automatically when a new custom error is registered.
Gets a custom error type.
is<errorName>Error(err)
This function is added automatically when a new custom error is registered.
Returns true
if err
is a custom error, false
otherwise.
err
- error object, required.Alexander Mac
Licensed under the MIT license.
FAQs
Custom errors for Node.js
The npm package n-custom-errors receives a total of 27 weekly downloads. As such, n-custom-errors popularity was classified as not popular.
We found that n-custom-errors 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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