console.debug()

The console method debug() outputs a message to the web console at the "debug" log level. The message is only displayed to the user if the console is configured to display debug output.

Note: This feature is available in Web Workers.

Syntax

console.debug(obj1 [, obj2, ..., objN]);
console.debug(msg [, subst1, ..., substN]);

Parameters

obj1 ... objN
A list of JavaScript objects to output. The string representations of each of these objects are appended together in the order listed and output to the console.
msg
A JavaScript string containing zero or more substitution strings, which are replaced with subst1 through substN in consecutive order.
subst1 ... substN
JavaScript objects with which to replace substitution strings within msg. This gives you additional control over the format of the output. See Using string substitutions in console for a description of how substitutions work.

See Outputting text to the console in the documentation of the console object for details.

Specifications

Specification Status Comment
Console API
The definition of 'console.debug()' in that specification.
Living Standard Initial definition

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
debugChrome Full support 1Edge Full support 12Firefox Full support 4IE Full support 10Opera Full support 11Safari Full support 4WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support 11Safari iOS Full support 3.2Samsung Internet Android Full support 1.0
Substitution stringsChrome Full support 1
Notes
Full support 1
Notes
Notes In version 28, if a negative value is passed to %d, it will be rounded down to the closest negative integer. For example, -0.1 becomes -1.
Edge Full support 12
Notes
Full support 12
Notes
Notes Before Edge 79, %c is not supported.
Notes Before Edge 79, %d outputs a 0 if the specified value isn't a number.
Firefox Full support 9IE Full support 10
Notes
Full support 10
Notes
Notes %c is not supported.
Notes %d outputs a 0 if the specified value isn't a number.
Opera Full support 15Safari ? WebView Android Full support 1
Notes
Full support 1
Notes
Notes In version 28, if a negative value is passed to %d, it will be rounded down to the closest negative integer. For example, -0.1 becomes -1.
Chrome Android Full support 18
Notes
Full support 18
Notes
Notes In version 28, if a negative value is passed to %d, it will be rounded down to the closest negative integer. For example, -0.1 becomes -1.
Firefox Android Full support 9Opera Android Full support 14Safari iOS ? Samsung Internet Android Full support 1.0
Notes
Full support 1.0
Notes
Notes In Samsung Internet 1.5, if a negative value is passed to %d, it will be rounded down to the closest negative integer. For example, -0.1 becomes -1.

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown
See implementation notes.
See implementation notes.