Awesome Open Source
Awesome Open Source

Codecov Build Node Twitter Medium

Medium article.

Show some to Node.js process errors.

Node.js prints process errors (uncaughtException, warning, unhandledRejection, rejectionHandled) on the console which is very useful. Unfortunately those errors:

log-process-errors fixes all those issues.

Without log-process-errors:

Screenshot before

With log-process-errors:

Screenshot after

Use cases

  • Proper logging of process errors in production.
  • Debugging of process errors in development.
  • Automated testing of process errors.


You can try this library:


Production code (e.g. a server) can install this either as a production or development dependency:

npm install log-process-errors

However, libraries should install this as a development dependency:

npm install -D log-process-errors

This is because logging is modified globally and libraries users might not expect this side-effect. Also, this might lead to conflicts between libraries.

This package is an ES module and must be loaded using an import or import() statement, not require().


import logProcessErrors from 'log-process-errors'

logProcessErrors() should be called as early as possible in the code, before other import statements.


options is an optional object with the following properties.


Type: function(error, level, originalError)

Customizes how process errors are logged.
Full documentation.


Type: object
Default: { warning: 'warn', multipleResolves: 'info', default: 'error' }

Which log level to use.
Full documentation.


Type: string[]
Default: ['uncaughtException', 'unhandledRejection'] for Node >= 15.0.0, ['uncaughtException'] otherwise.

Which process errors should trigger process.exit(1).
Full documentation.


Type: string
Value: 'ava', 'mocha', 'jasmine', 'tape' or 'node_tap'
Default: undefined

When running tests, makes them fail if there are any process errors.
Full documentation.


Type: boolean
Default: true if the output is a terminal.

Colorizes messages.
Full documentation.


For any question, don't hesitate to submit an issue on GitHub.

Everyone is welcome regardless of personal background. We enforce a Code of conduct in order to promote a positive and inclusive environment.


This project was made with . The simplest way to give back is by starring and sharing it online.

If the documentation is unclear or has a typo, please click on the page's Edit button (pencil icon) and suggest a correction.

If you would like to help us fix a bug or add a new feature, please check our guidelines. Pull requests are welcome!

Thanks go to our wonderful contributors:


Steven Vachon


Andy Brenneke

Get A Weekly Email With Trending Projects For These Topics
No Spam. Unsubscribe easily at any time.
Javascript (1,510,439
Nodejs (53,757
Library (11,211
Testing (6,362
Es6 (5,296
Monitoring (4,123
Logging (3,396
Test (2,678
Promise (1,420
Debugging (907
Process (646
Error Handling (639
Error (614
Code Quality (407
Exceptions (378
Handler (343
Related Projects