Errno

errno

Better libuv error handling & reporting.

🐴 said: Ever find yourself needing more details about Node.js errors? Me too, so node-errno contains the errno mappings direct from libuv so you can use them in your code.

By errno:

1
2
3
4
5
6

require('errno').errno[3]
// → {
//     "errno": 3,
//     "code": "EACCES",
//     "description": "permission denied"
//   }

By code:

1
2
3
4
5
6

require('errno').code.ENOTEMPTY
// → {
//     "errno": 53,
//     "code": "ENOTEMPTY",
//     "description": "directory not empty"
//   }

Make your errors more descriptive:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

var errno = require('errno')

function errmsg(err) {
  var str = 'Error: '
  // if it's a libuv error then get the description from errno
  if (errno.errno[err.errno])
    str += errno.errno[err.errno].description
  else
    str += err.message

  // if it's a `fs` error then it'll have a 'path' property
  if (err.path)
    str += ' [' + err.path + ']'

  return str
}

var fs = require('fs')

fs.readFile('thisisnotarealfile.txt', function (err, data) {
  if (err)
    console.log(errmsg(err))
})

Use as a command line tool:

1
2
3
4
5
6
7
8
9
10
11
12
13
14

~ $ errno 53
{
  "errno": 53,
  "code": "ENOTEMPTY",
  "description": "directory not empty"
}
~ $ errno EROFS
{
  "errno": 56,
  "code": "EROFS",
  "description": "read-only file system"
}
~ $ errno foo
No such errno/code: "foo"

P.S: You can also create custom-erros.

GIF FTW!

errno

Suggest a module

Comments