Err NPM | npm.io

err

A tiny library to create custom errors in JavaScript.

:cloud: Installation

# Using npm
npm install --save err

# Using yarn
yarn add err

:clipboard: Example

const Err = require("err");

// Basic usage
let e1 = new Err("Some nasty stuff happened");
console.log(e1);
// => [Error: Some nasty stuff happened]

// Provide the error code
let e2 = new Err("Some nasty stuff happened", "NASTY_STUFF_HAPPENED");
console.log(e2);
// => {
//   [Error: Some nasty stuff happened]
//   code: 'NASTY_STUFF_HAPPENED'
// }

// Provide the error code and some data
let e3 = new Err("Some nasty stuff happened", "NASTY_STUFF_HAPPENED", {
    additional: "data"
});
console.log(e3);
// => {
//   [Error: Some nasty stuff happened]
//   additional: 'data'
// , code: 'NASTY_STUFF_HAPPENED'
// }

// Provide the error data (including the code as well)
let e4 = new Err("Some nasty stuff happened", {
    additional: "data"
  , code: "NASTY_STUFF_HAPPENED"
});
console.log(e4);
// => {
//   [Error: Some nasty stuff happened]
//   additional: 'data'
// , code: 'NASTY_STUFF_HAPPENED'
// }

// Wrap an existing error
let existingError = new Error("Some nasty stuff happened");
let e5 = new Err(existingError, {
    additional: "data"
  , code: "NASTY_STUFF_HAPPENED"
  , and: "some more data"
});
console.log(e5);
// => {
//   [Error: Some nasty stuff happened]
//   additional: 'data'
// , code: 'NASTY_STUFF_HAPPENED'
// , and: 'some more data'
// }

let e6 = new Err({
    message: "Something went really wrong!!!"
  , additional: "data"
  , code: "NASTY_STUFF_HAPPENED"
  , and: "some more data"
});
console.log(e6);
// => {
//   [Error: Something went really wrong!!!]
//   additional: 'data'
// , code: 'NASTY_STUFF_HAPPENED'
// , and: 'some more data'
// }

let e7 = new Err("Invalid option '<option>'.", {
    option: "test"
});
console.log(e7);
// { [Error: Invalid option 'test'.] option: 'test' }

:question: Get Help

There are few ways to get help:

Please post questions on Stack Overflow. You can open issues with questions, as long you add a link to your Stack Overflow question.
For bug reports and feature requests, open issues. :bug:
For direct and quick help, you can use Codementor. :rocket:

:memo: Documentation

`Err(error, code, data)`

Create a custom error object.

Params

String|Error|Object error: The error message or an existing Error instance or the data object where the message is the error message.
String|Object code: The error code or the data object.
Object data: The data object (its fields will be appended to the Error object).

Return

Error The custom Error instance.

:yum: How to contribute

Have an idea? Found a bug? See how to contribute.

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