kerror

KError

Key

• Usage
• Example
• Handler Middleware
• Generators
  • KError([seed], [status], [details])
  • KError.notFound([errorOverride] [details])
  • KError.notAuth([errorOverride] [details])

Usage

var koa    = require('koa');
var route  = require('koa-route')
var KError = require('KError');
var app    = koa();

app.use(KError.handler());

app.use(route.get('/ok', function *() {
  this.body = { success : true };
}));


app.use(route.get('/400', function *() {
  throw KError();
}));


app.use(route.get('/401', function *() {
  throw KError.notAuth();
}));

app.listen(3000);

Example

Take a look at the Example Server

To Run:

• $ npm install
• $ npm start
• visit http://localhost:3000

Handler Middleware

Catches and normalizes errors that bubble up from the yielded middleware. all errors follow the same format.

{
  error   : String,
  status  : Number,
  details : Mixed
}

Unrecognized errors are printed to the console and a 500 is sent of the following format.

{
  error   : 'Internal Server Error',
  status  : 500,
  details : null
}

To catch errors, simply add to koa's middleware.

var koa    = require('koa');
var KError = require('KError');
var app    = koa();

app.use(KError.handler());

// all routes return
// {
//   error   : 'Not Found',
//   status  : 404,
//   details : null
// }

Generators

KError([seed], [status], [details])

An error can be generated using multiple error parameters.

throw KError('My error is bad and I feel bad', 400, ['one bad thing', 'another bad thing']);

An error can also be generated using a single object parameter.

throw KError({
  error   : 'My error is bad and I feel bad',
  status  : 400,
  details : ['one bad thing', 'another bad thing']
});

Any of the parameters can be omitted in either case, and will default to the following unless overridden.

{
  error   : 'Generic Error',
  status  : 400,
  details : null
}

KError.notFound([errorOverride] [details])

Alias for

throw KError({
  error   : errorOverride || 'Not Found',
  status  : 404,
  details : details || null
});

KError.notAuth([errorOverride] [details])

Alias for

throw KError({
  error   : errorOverride || 'Not Authorized',
  status  : 401,
  details : details || null
});