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minute: Sign up JavaScript: How do I print a message to the error console? up vote 355 down vote favorite 56 How can I print a message to the error console, preferably including a variable? For example, something like: print('x=%d', x); javascript debugging share|improve this question edited Jul 12 '12 at 17:23 Peter Mortensen 10.2k1369107 asked Oct 2 '08 at 20:23 Mark javascript error console chrome Harrison 127k87226336 7 Which console are you talking about. Browser console or JavaScript framework specific console? –spoon16 Oct 2 '08 at 20:27 add a comment| 15 Answers 15 active oldest votes up vote 404 down vote accepted Install Firebug and then you can use console.log(...) and console.debug(...), etc. (see the documentation for more). share|improve this answer edited Aug 20 '12 at 4:59 Community♦ 11 answered Oct 2 '08 at 20:26 Dan 31.6k75165 14 @Dan: The WebKit Web Inspector also supports the FireBug console API –olliej Oct 3 '08 at 3:45 125 why is this the accepted answer? he didn't ask how to write to the firebug console, he asked how to write to the error console. not being a dick or anything, just pointing it out. –matt lohkamp Oct 3 '08 at 10:25 111 +1. And for the benefit of anyone arriving at this question now, it's worth pointing out that since the question was answered, all browsers have now implemented the console object, so console.log() etc should work in all browsers, including IE. However, in all cases,
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow print in java the company Business Learn more about hiring developers or posting ads with us Stack javascript console.error example Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of javascript print to console 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to log exceptions in JavaScript up vote 4 down vote favorite 2 As a C# developer I'm http://stackoverflow.com/questions/164397/javascript-how-do-i-print-a-message-to-the-error-console used to the following style of exception handling: try { throw SomeException("hahahaha!"); } catch (Exception ex) { Log(ex.ToString()); } Output ------ SomeNamespace.SomeException: hahahaha! at ConsoleApplication1.Main() in ConsoleApplication1\Program.cs:line 27 Its really simple, and yet tells me everything I need to know about what the exception was and where it was. How do I achieve the equivalent thing in JavaScript where the exception object itself might just be a string. I really want to http://stackoverflow.com/questions/1238000/how-to-log-exceptions-in-javascript be able to know the exact line of code where the exception happened, however the following code doesn't log anything useful at all: try { var WshShell = new ActiveXObject("WScript.Shell"); return WshShell.RegRead("HKEY_LOCAL_MACHINE\\Some\\Invalid\\Location"); } catch (ex) { Log("Caught exception: " + ex); } Output ------ Caught exception: [object Error] EDIT (again): Just to clarify, this is for internal application that makes heavy use of JavaScript. I'm after a way of extracting useful information from JavaScript errors that may be caught in the production system - I already have a logging mechanism, just want a way of getting a sensible string to log. javascript exception-handling share|improve this question edited Sep 18 '09 at 15:56 community wiki 4 revsJustin add a comment| 7 Answers 7 active oldest votes up vote 0 down vote accepted You can use almost in the same manner ie. try { throw new Error("hahahaha!"); } catch (e) { alert(e.message) } But if you want to get line number and filename where error is thrown i suppose there is no crossbrowser solution. Message and name are the only standart properties of Error object. In mozilla you have also lineNumber and fileName properties. share|improve this answer edited Aug 6 '09 at 12:25 answered Aug 6 '09 at 10:26 Eldar Djafarov 7,50822324 This doe
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Mastering Console Logging Posted by Alex R. Young on February 2nd, 2012. Featured tutorials node modules Mastering Console Logging Posted by Alex R. Young on February 2nd, 2012. The console object crops up everywhere. But what is it, and what can it do? Most people seem to use it without realising the sheer convenience it can provide. Let's take a look at where it comes from, and how to use it correctly. Built-in vs. Host The console object is what's known as a host object in ECMAScript. Host objects are supplied by the host environment. Node's documentation refers to console as a "global object". This is different to a native object which is an object in the ECMAScript implementation in question, and defined by the specification rather than the host environment. Built-in objects are similar, but are present when an ECMAScript program starts. In addition, built-in objects inherit from Object or Function whereas host objects might not. Host objects may also not be available when execution starts. That's why some browsers treat console differently depending on whether the output is visible or not. Notice that Mozilla's documentation states that this behaviour has changed: Prior to Gecko 12.0 (Firefox 12.0 / Thunderbird 12.0) , the console object's methods only work when the Web Console is open. Starting with Gecko 12.0, output is cached until the Web Console is opened, then displayed at that time. Methods Since console isn't yet formally covered by a specification, implementations vary. In Node it's closely tied to standard input output, referred to as "stdio" by the documentation. This gives rise to error and log methods that will be printed to the appropriate output stream. Most implementations give us convenient ways of separating output for debugging messages, errors, and warnings: