html-codes

HTML Codes enumeration which includes an HtmlError class extending the javascript Error class.

Installation

npm i html-codes --save

Enums

• clientErrorCodes - These are lists of globaly accepted server side error codes
• serverErrorCodes - These are lists of globaly accepted server side error codes

Sample use

const s: clientErrorCodes = clientErrorCodes.badRequest;

if (s === 500 || a === clientErrorCodes.unauthorized) {
  console.log('test');
}

HtmlError class

This class extends the default Javascript Error by adding 2 properties and a cutom constructor

try{
  throw new HtmlError(clientErrorCodes.unauthorized, 'Please log-in first');
} catch(err) {
  // note in Typescript, we cannot define the type of catch err.
  // We can however manualy check if it derives from a certain class instance
  if (err instaceof HtmlError) {
    console.log(`Error (${err.statusCode}) ${err.statusName}: ${err.message}`);
    // this prints out the following:
    // "Error (401) unauthorized: Please log-in first
  }
}

Constructor parameters

• clientErrorCodes | serverErrorCodes - The first parameter is either one of the error code enumerations
• message - The error message to send similar to new Error(message)

Class properties

• statusCode - The numeric error code value
• statusName - The human readable error code value