Houston, we have a problem

Howhap is a small library for dealing with parameterized errors.

npm install --save howhap

let Howhap = require('howhap');

// Each error needs a message and a status code.
let authError = new Howhap({
    message: 'Please enter a password.',
    status: 400
});

// Errors can also use simple templating
let emailError = new Howhap({
    message: '"{{ email }}" is not a valid email.',
    status: 400
}, { email: 'fake' });

// You can display error messages as a string
emailError.toString(); // "fake" is not a valid email

// Or JSON
emailError.toJSON();
/*
 * {
 *    message: '"{{ email }}" is not a valid email.',
 *    status: 400,
 *    params: { email: 'fake' }
 * }
 */

Properties

message

type: string

    err.message = 'Something went wrong {{ e }}';

status

type: integer or string representation of an integer

    err.status = 400;
    err.status = '500';

params

type: object

    err.params = { e: 'foo' };

Methods

Howhap.prototype.toString()

returns: a string representation of the error with parameters replaced.

let err = new Howhap(
    {message: '{{ x }} went wrong', status: 500},
    { x: 'a thing' }
);
console.log(err.toString()); // 'a thing went wrong'

Howhap.prototype.toJSON()

returns: an object representation of the error.

let err = new Howhap(
    {message: '{{ x }} went wrong', status: 500},
    { x: 'a thing' }
);
console.log(err.toJSON());
// {
//     message: '{{ x }} went wrong',
//     status: 500,
//     params: { x: 'a thing' }
// }

Howhap.prototype.set(obj)

obj: an object with message, status and params properties.

sets all error properties (message, status, params) in one function call.

let err = new Howhap(
    {message: '{{ x }} went wrong', status: 500},
    { x: 'a thing' }
);
err.set({
    message: '{{ model }} was not found',
    status: 404,
    params: { model: 'User' }
})
console.log(err.toJSON());
// {
//     message: '{{ model }} was not found',
//     status: 404,
//     params: { model: 'User' }
// }
console.log(err.toString()); // User was not found