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@blinkmobile/custom-errors

Custom Errors

Configuration driven error messages for nodejs.

Install

npm i @blinkmobile/custom-errors

Usage

via the static #use method:

const ErrorFactory = require('@blinkmobile/custom-errors');
const errorMap = {
  100: 'Error saving data: {0}',
  200: 'File already exists'
};

const fileErrors = ErrorFactory.use(errorMap);

throw fileErrors(100, 'No filename specified')

// Error: Error saving data: No filename specified

or shorter:

const fileErrors = require('@blinkmobile/custom-errors').use({
  100: 'Error saving data: {0}',
  200: 'File already exists'
});

throw fileErrors(100, 'No filename specified')

// Error: Error saving data: No filename specified

or via the constructor and the create method:

const ErrorFactory = require('@blinkmobile/custom-errors');
const errorMap = {
  1000: 'Invalid Username: {0}',
  2000: 'Invalid Password'
};

const factory = new ErrorFactory(errorMap);
throw factory.create(2000)

// Error: Invalid Password

Error messages and Placeholders

An error message has a unique number as its key, and it can have placeholders for customising the error. Placeholders are defined as a number inside curly braces, eg {0} or {1}

Placeholders are replaced with the tail of the arguments supplied to the #create function. You may leave out a placeholder by specifying null or undefined. Because of this, any consecutive spaces will be replaced with a single space.

const ErrorFactory = require('@blinkmobile/custom-errors');
const errorMap = {
  100: 'Error saving data: {0} {1} {2}',
  200: 'File already exists'
};

const fileErrors = ErrorFactory.use(errorMap);

throw fileErrors(100, 'No filename specified')
// Error: Error saving data: No filename specified

const email = [e-mail];
throw fileErrors(100, 'Disk Full', null, `contact ${email}` );
// Error: Error saving data: Disk Full contact [e-mail]