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express-errorhandlers 🚀

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NPM

Error handler for expressjs(TypeScript)

Install

It is registered in the npm repository - express-errorhandlers. Please install from the npm command.

npm install --save express-errorhandlers

Demo Server

git clone git@github.com:cam-inc/express-errorhandlers.git
cd express-errorhandlers
npm install
npm start # access url : http://localhost:3000/

Screenshot

Access Brower(html)

image

Access curl(json)

$ curl -v -H 'Accept:application/json' "http://localhost:3000/500?foo=1" | jq .
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 3000 (#0)
> GET /500?foo=1 HTTP/1.1
> Host: localhost:3000
> User-Agent: curl/7.54.0
> Accept:application/json

< HTTP/1.1 500 Internal Server Error
< X-Powered-By: Express
< Content-Type: application/json; charset=utf-8
< Content-Length: 1758
< ETag: W/"6de-25i+IrzWztUq0cBgAq/eBD39P50"
< Date: Tue, 06 Mar 2018 09:57:02 GMT
< Connection: keep-alive

{ [1758 bytes data]
100  1758  100  1758    0     0   183k      0 --:--:-- --:--:-- --:--:--  190k
* Connection #0 to host localhost left intact
{
  "response": {
    "status": 500,
    "message": "Server Error",
    "extra": {},
    "stack": "Error: /500 Server Error!!\n    at app.get (/Users/fkei/express-errorhandlers/demo.js:41:8)\n    at Layer.handle [as handle_request] (/Users/fkei/express-errorhandlers/node_modules/express/lib/router/layer.js:95:5)\n    at next (/Users/fkei/express-errorhandlers/node_modules/express/lib/router/route.js:137:13)\n    at Route.dispatch (/Users/fkei/express-errorhandlers/node_modules/express/lib/router/route.js:112:3)\n    at Layer.handle [as handle_request] (/Users/fkei/express-errorhandlers/node_modules/express/lib/router/layer.js:95:5)\n    at /Users/fkei/express-errorhandlers/node_modules/express/lib/router/index.js:281:22\n    at Function.process_params (/Users/fkei/express-errorhandlers/node_modules/express/lib/router/index.js:335:12)\n    at next (/Users/fkei/express-errorhandlers/node_modules/express/lib/router/index.js:275:10)\n    at urlencodedParser (/Users/fkei/express-errorhandlers/node_modules/body-parser/lib/types/urlencoded.js:91:7)\n    at Layer.handle [as handle_request] (/Users/fkei/express-errorhandlers/node_modules/express/lib/router/layer.js:95:5)",
    "extraDebug": {}
  },
  "request": {
    "accessurl": "http://localhost:3000/500?foo=1",
    "headers": {
      "host": "localhost:3000",
      "user-agent": "curl/7.54.0",
      "accept": "application/json"
    },
    "hostname": "localhost",
    "ip": "::1",
    "ips": [],
    "originalUrl": "/500?foo=1",
    "url": "/500?foo=1",
    "path": "/500",
    "httpVersion": "1.1",
    "method": "GET",
    "protocol": "http",
    "params": {},
    "query": {
      "foo": "1"
    }
  }
}

Access curl(text)

$ curl -v -H 'Accept:text/plain' "http://localhost:3000/500?foo=1"
*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 3000 (#0)
> GET /500?foo=1 HTTP/1.1
> Host: localhost:3000
> User-Agent: curl/7.54.0
> Accept:text/plain

< HTTP/1.1 500 Internal Server Error
< X-Powered-By: Express
< Content-Type: text/plain; charset=utf-8
< Date: Tue, 06 Mar 2018 09:59:19 GMT
< Connection: keep-alive
< Transfer-Encoding: chunked
<
>>>> Request

Access Url : http://localhost:3000/500?foo=1
Headers : {
  &quot;host&quot;: &quot;localhost:3000&quot;,
  &quot;user-agent&quot;: &quot;curl/7.54.0&quot;,
  &quot;accept&quot;: &quot;text/plain&quot;
}
Host name : localhost
IP : ::1
IPs :
Original URL : /500?foo=1
URL : /500?foo=1
Path : /500
HTTP Version : 1.1
HTTP Method : GET
HTTP Protocol : http
HTTP Params : {}
HTTP Querys : {
  &quot;foo&quot;: &quot;1&quot;
}
<<<< Response

Status : 500
Message : Server Error
Extra : {}Error Stack trace : Error: /500 Server Error!!
    at app.get (/Users/fkei/express-errorhandlers/demo.js:41:8)
    at Layer.handle [as handle_request] (/Users/fkei/express-errorhandlers/node_modules/express/lib/router/layer.js:95:5)
    at next (/Users/fkei/express-errorhandlers/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/Users/fkei/express-errorhandlers/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/Users/fkei/express-errorhandlers/node_modules/express/lib/router/layer.js:95:5)
    at /Users/fkei/express-errorhandlers/node_modules/express/lib/router/index.js:281:22
    at Function.process_params (/Users/fkei/express-errorhandlers/node_modules/express/lib/router/index.js:335:12)
    at next (/Users/fkei/express-errorhandlers/node_modules/express/lib/router/index.js:275:10)
    at urlencodedParser (/Users/fkei/express-errorhandlers/node_modules/body-parser/lib/types/urlencoded.js:91:7)
    at Layer.handle [as handle_request] (/Users/fkei/express-errorhandlers/node_modules/express/lib/router/layer.js:95:5)
* Connection #0 to host localhost left intact
Error Extra debug : {}`

API

const expressErrorhandlers = require('express-errorhandlers');

Handler

Handler containing error class.

const Handler = expressErrorhandlers.Handler;

const err = new Error('Error!!');
const handler = new Handler(err, 500, 'Internal Server Error', {serviceErrorCode: 'A-500-000001'}, {userId: 'fkei'})

Handler constructor

  • Type : (Error: error, Int: status, String: message, Object: extra, Object extraDebug)

Handler properties

  • error
    • Type: Error
    • Description: Detected error instance.
    • Default: new Error();
    • Required: no
  • status
    • Type: Int
    • Description: HTTP Response status code.
    • Default: 500
    • Required: no
  • message
    • Type: String
    • Description: Error message.
    • Default: Server Error
    • Required: no
  • extra
    • Type: Object
    • Description: It is a data area that you can freely use. It is also used in production environments.
    • Default: {}
    • Required: no
  • extraDebug
    • Type: Object
    • Description: It is a data area that you can freely use. Ignored in production environment.
    • Default: {}
    • Required: no

Types of Middleware

Skip OK Handler

We will return the unnecessary request such as favicon.ico etc. with 200 OK. Used with API Server etc.

Register to expressjs middleware. It is desirable after router.

app.use(expressHandlers.middleware.skipOkHandler(
  paths: ['/favicon.ico', '/robots.txt', 'sitemap.xml'], // Set to skip trailing. (optional)
  fn: (err, req, res, next) => { // It is possible to overwrite HTTP Response processing. (optional)
    res.status(200).end();
  };
));

It can be used alone.

Not Found

404 Not Found process is done simply.

Register to expressjs middleware. It is desirable after router.

app.use(expressHandlers.middleware.notFound(
  message : 'Not Found', // custom response message (optional)
  extra : {...}, // It is a data area that you can freely use. It is also used in production environments. (optional)
  extraDebug: {...}, //It is a data area that you can freely use. Ignored in production environment. (optional)
));

Not Found depends on Error Handler middleware.

Error Handler

Implement common error handler using "express next(error)".

  • Response data supports Content-Type of json, html, plain separately for HTTP Header Accept.
  • It is possible to change the output format by development and production.
  • HTML and TEXT output can use template engine(only pug).
  • For custom processing such as log output, any processing can be executed after all processing is finished. (options: final)

Register

Register to expressjs middleware. It is desirable after router.

app.use(expressHandlers.middleware.errorHandler({
  debug: process.env.NODE_ENV !== 'production', //  (optional)
  templateHTML: path.join(__dirname + 'xxx.pug') or 'template string', // pug template string or pug file path (text/html) (optional)
  templateHTMLOptions: { debug: true }, // pug compile config (text/html) (optional)
  templateTEXT: {...}, // pug template string or pug file path (text/plain) (optional)
  templateTEXTOptions: {...}, // pug compile config (text/plain) (optional)
  status: 500, // default response status code (optional)
  message: 'Internal Server Error' // default error message (optional)
  extra: {...}, // It is a data area that you can freely use. It is also used in production environments. (optional)
  extraDebug: {...}, //It is a data area that you can freely use. Ignored in production environment. (optional)
  final: (req, res, handler) => { // Postprocessing function. (optional)
    console.error('final. error:', handler); // log output
  }
}));
debug off (production)

If debugging is off, only the following data will be returned.

{
  response: {
    status: data.status,
    message: data.message,
    extra: data.extra,
  }
};

Changelog

Detailed changes for each release are documented in the release notes.

Copyright

CA Mobile, Inc. All rights reserved.

LICENSE

MIT LICENSE LICENSE