Extended Error

Description:

• Allows you to create of a instance of Error with additional properties specfied through a error map supplied by user(See example of a sample error map below).
• Allows variables subsitution in the additional properties
• It extends from Error

  util.inherits(extended-error, Error);

Installation

$ npm install extended-error

Usage:

Step 1: Require extended-error

extended-error = require('extended-error')

Step 2: Create a error map with additional properties for a error

 var sample_error_map =
     { 
        ERROR_101 : {
          message       : "Error has occured",
          http_code     : 400,
          user_message  : "Please try again later" 
        },
        
        DB_101 : {
          msg          : "Error in DB operation. Error is <<err>>",
          master_code  : 400,
          user_message : "<<err2>>"
        }
     }

Step 3: Add the error_map

 extended-error.set_error_map(sameple_error_map)

Step 4: Create a new instance of error. Additional properties for the error instance will be set automatically

1. Without variable susitution

   var error = new extended-error("ERROR_101")
   Output: 
       error.message      => "Error has occured"
       error.http_code    => 400
       error.errorCode    => "ERROR_101"
       error.user_message => "Please try again later"

2. With variable subsitution Allows you to create a new instance of error and allows you to customize error message.

   var error = new extended-error("DB_101", {err : "Network Error", err2 : "DB error"})
   Output:
       error.msg          => "Error in DB operation. Error is Network Error"
       error.master_code  => "400"
       error.user_message => "DB error"
       error.errorCode    => "DB_101"