Exception-factory NPM

exception-factory

Simple powerful exception factory to create custom error objects, with error code (!), error constants and optional prefixes.

I. Installation

npm install exception-factory --save

Use it like this:

var customException = require('exception-factory').build('customException');

customException.const('NOT_FOUND', '001');
customException.const('FATAL_ERROR', '002');

try {
   throw new customException('Oh no!', customException.FATAL_ERROR);
} catch (err) {
   console.log(err.name); // 'customException'
   console.log(err.code); // '002'
   console.log(err.message); // 'Oh no!'
}

or with Promise:

var validationException = require('exception-factory').build('validationException');
var typeException = require('exception-factory').build('typeException');

Promise.resolve(function(){
   throw new validationException('Password is too short');
})
.catch(validationException, function(err){
   // catched here!
   console.log(err);
   throw err;
})
.catch(typeException, function(err){
   // not this time!
   console.log(err);
   throw err;
})
.catch(function(err){
   // just for unexpected very vanilla errors!
   throw err;
});

You can also define universal prefix of exception:

var validationException = require('exception-factory').build('validationException', 'Validation exception: ');

try {
   throw new validationException('Password is too short');
} catch (err) {
   console.log(err); // Validation exception: Password is too short
}