LoggingΒΆ

CasperJS allows logging using the casper.log() method and these standard event levels:

  • debug
  • info
  • warning
  • error

Sample use:

var casper = require('casper').create();
casper.log('plop', 'debug');
casper.log('plip', 'warning');

Now, there are two things to distinguish: log storage and log display; by default CasperJS won’t print the logs to the standard output. In order to do so, you must enable the verbose Casper option:

var casper = require('casper').create({
    verbose: true
});

Also, by default Casper is configured to filter logging which is under the error level; you can override this setting by configuring the logLevel option:

var casper = require('casper').create({
    verbose: true,
    logLevel: 'debug'
});

You can also dump a JSON log of your Casper suite just by rendering the contents of the Casper.logs property:

var casper = require('casper').create({
// ...
casper.run(function() {
    require('utils').dump(this.logs);
    this.exit();
});

Last, if you print log messages to the standard output using the verbose option, you’ll get some fancy colors:

var casper = require('casper').create({
    verbose: true,
    logLevel: 'debug'
})
casper.log('this is a debug message', 'debug');
casper.log('and an informative one', 'info');
casper.log('and a warning', 'warning');
casper.log('and an error', 'error');
casper.exit();

This will give the following output:

image

image

Hint

CasperJS doesn’t write logs on the filesystem. You have to implement this by yourself if needed.

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