User

Special: log page

JS log

Log all javascript messages to the Drupal log.

What messages or events are logged?

• console.debug() messages are logged as debug messages.
• console.info() messages are logged as info messages.
• console.log() messages are logged as info messages.
• console.warn() messages are logged as warnings.
• console.error() messages are logged as errors.
• unhandledrejection events are logged as notices.
• error events are logged as errors.

How does it work?

The native console.debug(), console.info(), console.warn(), and console.error() methods are extended with a fetch to the Drupal server, logging appropriate messages. The events are handled with eventListeners in a similar way.

This means there's no need to add any custom javascript code to make this module work!

Installation

• Enable the module
• Choose whose messages are logged via admin/people/permissions/module/jslog
• Fine-tune configuration via /admin/config/system/jslog if needed

DoS protection

Javascript loops can cause a DoS attack on the server. Therefor requests to the server are queued in Promises. Also, there is a configurable limit to the number of messages that can be logged per page.

Extending functionality in the frontend

Whenever a message is logged, the custom jslog event is dispatched. This event can be used to show messages to the frontend if suitable:

addEventListener('jslog', ({detail: {value, level}}) => {
  // value: the log message
  // level: debug, info, notice, warning, or error
}, {passive: false})

Browser support

• Browsers that support optional chaining.

Dependencies

None