Parse errors to provide a consistent metadata object across Browser and Node environments. Made for Cabin.

• Install
• How does it work
• Usage
  • Node
  • VanillaJS
  • Bundler
• Supported Platforms
• Contributors
• License

npm:

npm install parse-err

This package exports a function that accepts two arguments (err, props).

• req (Object) - an HTTP request
• props (Array) - a list of properties to cherry-pick from the error object parsed out of err (by default all properties are returned; even non-enumerable ones and ones on the prototype object)

This function iterates over the prototype of the error and the error itself to get all non-Function properties and returns these properties as an object.

Normally if you console.log(err) it will not show you all fields such as type, statusCode, or code (e.g. if you're using Stripe).

In our case, we wanted to store these properties in our logs with Cabin.

As of v1.0.0 it now parses err.errors Array too – which adds support for packages such as maybe-combine-errors and combine-errors. This is useful if you combine multiple errors into one Error object, and subsequently set a property of err.errors = errors where errors is an Array of the errors combined.

const parseErr = require('parse-err');

const err = new Error('Oops!');

// just a random example
err.name = 'BeepBoop';
err.code = 100;
err.statusCode = 200;

console.error(parseErr(err));

{ name: 'BeepBoop',
  message: 'Oops!',
  stack: 'BeepBoop: Oops!\n    at Object.<anonymous> (/Users/user/Projects/parse-err/test.js:3:13)\n    at Module._compile (module.js:652:30)\n    at Object.Module._extensions..js (module.js:663:10)\n    at Module.load (module.js:565:32)\n    at tryModuleLoad (module.js:505:12)\n    at Function.Module._load (module.js:497:3)\n    at Function.Module.runMain (module.js:693:10)\n    at startup (bootstrap_node.js:188:16)\n    at bootstrap_node.js:609:3',
  code: 100,
  statusCode: 200 }

<script src="https://unpkg.com/parse-err"></script>
<script type="text/javascript">
  (function() {
    var err = new Error('Oops!');
    err.name = 'BeepBoop';
    err.statusCode = 500;
    console.error(parseErr(err));
  })();
</script>

If you are using browserify, webpack, rollup, or another bundler, then you can follow the same usage as Node above.

• Node: v6.x+

• Browsers (see .browserslistrc):

  npx browserslist

  and_chr 107
  and_ff 106
  and_qq 13.1
  and_uc 13.4
  android 107
  chrome 107
  chrome 106
  chrome 105
  edge 107
  edge 106
  edge 105
  firefox 107
  firefox 106
  firefox 105
  firefox 102
  ios_saf 16.1
  ios_saf 16.0
  ios_saf 15.6
  ios_saf 15.5
  ios_saf 14.5-14.8
  kaios 2.5
  op_mini all
  op_mob 72
  opera 92
  opera 91
  safari 16.1
  safari 16.0
  safari 15.6
  samsung 19.0
  samsung 18.0

MIT © Nick Baugh