Name: koa-error-mapper
Owner: Uphold
Description: koa error mapper
Created: 2015-03-10 15:24:32.0
Updated: 2017-03-22 18:44:11.0
Pushed: 2017-03-23 11:04:46.0
Size: 64
Language: JavaScript
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koa-error-mapper is a middleware that handles application errors by mapping them to a custom format.
Install the package via yarn:
rn add koa-error-mapper
or via npm:
m install koa-error-mapper --save
Mappers are responsible for handling errors and normalizing the response. A generic fallback mapper is included in case no custom mapper is available.
The only interface for a mapper is a map() function. A mapper should return undefined if it is not capable or responsible for mapping a specific error. It must return an object with status and body. If not returned on the object, the value on the response will be undefined for precaution. It may also contain a headers property.
le.exports = {
p(e) {
if (!(e instanceof CustomError)) {
return;
}
// Add your own custom logic here.
return { status: e.code, body: { message: e.message }, headers: { Foo: 'Bar' }};
Now use the error mapper and register CustomMapper:
strict';
t CustomError = require('path/to/my/custom/error');
t Koa = require('koa');
t app = new Koa();
t customMapper = require('path/to/my/custom/mapper');
use(errorMapper([customMapper]);
get('/', async () => {
row new CustomError(401, 'Ah-ah!');
listen(3000);
Result:
/
/1.1 401 Unauthorized
Bar
essage": "Ah-ah!" }
rn test
m version [<new version> | major | minor | patch] -m "Release %s"
MIT