console-hijack

Console-hijack

Intercepting and modifying common console printing methods in the browser. Why? To receive callback events when methods like console.log or console.error are called, and to mute native console methods (like log) in production.

Installation

NOTE: This module is still under development! Use in production at your own risk!

npm install console-hijack

...Then Include dist/console-hijack.js in your project. See examples for more info.

Usage

Including this script on your page automatically hijacks the following console methods: [LOG, INFO, WARN, ERROR, TRACE];

To receive a callback for a given method, simply listen to it:

document.addEventListener('console.log', callback);
console.log('hi mom'); // will trigger callback, and log to console!

callback(payload)

The callback function is invoked with a payload that has the following signature:

{
  type: [String], // the method called, like 'console.log'
  messages: [Array] // an array of all arguments passed - `console.log('hi', 'mom')` becomes `['hi', 'mom']`
}

log level

Set the log level to mute everything below that level. For example, setting the log level to WARN will mute LOG and INFO. The default level is LOG

console.hijack.level = console.hijack.WARN

Stop/Start

The console object can be restored by calling console.hijack.stop(). No more events will be fired and the previously intercepted methods will be returned to their original state. Resume hijacking by calling console.hijack.start()