https-error

Provides the HttpsError class and associated factory methods.

Version 1.0.2

Usage

$ npm install --save https-error

const HttpsError = require('https-error');

function sqrt(val) {
	if (val < 0) {
	    throw HttpsError.badRequest('Value %d cannot be negative.', val);
	} else {
	    return Math.sqrt(val);
    }
}

let err = HttpsError.internalServerError('Cannot connect to the database.');

console.log(err.toString());
// Error: 500 (Internal Server Error) Cannot connect to the database.

console.log(err.toJson());
// Outputs an object.

console.log(err.toHtml());
// Outputs an HTML string.

The badRequest method and internalServerError method are factory methods. No new keyword is required. There is one factory method for each of the 400- and 500-series errors.

If you want to call the constructor yourself, you can:

function sqrt(val) {
	if (val < 0) {
	    throw new HttpsError(400, util.format('Value %d cannot be negative.', val));
	} else {
	    return Math.sqrt(val);
    }
}

As you can see, using the factory method...

• is more readable,
• does not require the new keyword,
• handles util.format arguments.

You can also pass in an Error object...

let err = new Error('That record already exists.');

let conflict = HttpsError.conflict(err);

console.log(conflict.toString());
// Error: 409 (Conflict) That record already exists.

This is useful when wrapping a library error into an error for your REST API.