Unity WebGL content cannot currently be debugged with MonoDevelop or Visual Studio, which can make it difficult to find out what exactly is going wrong with your content. Here are some tips on how to get information out of your build.
Unity WebGL does not have access to your file system, so it will not write a log file like other platforms. However, it will write all logging information which would normally go to the log file (such as Debug.Log
, Console.WriteLine
or Unity’s internal logging) to the browser’s JavaScript console.
For debugging purposes, you may typically want to make a development build in Unity (the Development Build checkbox in the Build Settings window). Development builds allow you to connect the profiler, and they will not be minified, so the emitted JavaScript code will still contain human-readable (though C++-mangled) function names. These can be used by the browser to display stack traces when you run into a browser error, or when you throw an exception and exception support is disabled, or when using Debug.LogError
. Unlike the managed stack traces which you can get when enabling Full exception support (see below), these stack traces will have mangled names, and contain not only managed code, but also the internal UnityEngine code.
WebGL has different levels of exception support (See the page on Building for WebGL). By default, Unity WebGL will only support explicitly thrown exceptions. You can enable Full exception support which will then emit additional checks in the IL2CPP generated code to catch access to null references and out-of-bounds array elements in your managed code. These additional checks will significantly impact performance and increase code size and load times, so this mode is only recommended for debugging.
Full exception support will also emit function names to generate stack traces for your managed code. So you will see stack traces in the console for uncaught exceptions and for Debug.Log
statements, and you can get a stack trace string using System.Environment.Stacktrace
.
Did you find this page useful? Please give it a rating:
Thanks for rating this page!
What kind of problem would you like to report?
Is something described here not working as you expect it to? It might be a Known Issue. Please check with the Issue Tracker at issuetracker.unity3d.com.
Thanks for letting us know! This page has been marked for review based on your feedback.
If you have time, you can provide more information to help us fix the problem faster.
Provide more information
You've told us this page needs code samples. If you'd like to help us further, you could provide a code sample, or tell us about what kind of code sample you'd like to see:
You've told us there are code samples on this page which don't work. If you know how to fix it, or have something better we could use instead, please let us know:
You've told us there is information missing from this page. Please tell us more about what's missing:
You've told us there is incorrect information on this page. If you know what we should change to make it correct, please tell us:
You've told us this page has unclear or confusing information. Please tell us more about what you found unclear or confusing, or let us know how we could make it clearer:
You've told us there is a spelling or grammar error on this page. Please tell us what's wrong:
You've told us this page has a problem. Please tell us more about what's wrong:
Thanks for helping to make the Unity documentation better!
When you visit any website, it may store or retrieve information on your browser, mostly in the form of cookies. This information might be about you, your preferences or your device and is mostly used to make the site work as you expect it to. The information does not usually directly identify you, but it can give you a more personalized web experience. Because we respect your right to privacy, you can choose not to allow some types of cookies. Click on the different category headings to find out more and change our default settings. However, blocking some types of cookies may impact your experience of the site and the services we are able to offer.
More information
These cookies enable the website to provide enhanced functionality and personalisation. They may be set by us or by third party providers whose services we have added to our pages. If you do not allow these cookies then some or all of these services may not function properly.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
These cookies may be set through our site by our advertising partners. They may be used by those companies to build a profile of your interests and show you relevant adverts on other sites. They do not store directly personal information, but are based on uniquely identifying your browser and internet device. If you do not allow these cookies, you will experience less targeted advertising. Some 3rd party video providers do not allow video views without targeting cookies. If you are experiencing difficulty viewing a video, you will need to set your cookie preferences for targeting to yes if you wish to view videos from these providers. Unity does not control this.
These cookies are necessary for the website to function and cannot be switched off in our systems. They are usually only set in response to actions made by you which amount to a request for services, such as setting your privacy preferences, logging in or filling in forms. You can set your browser to block or alert you about these cookies, but some parts of the site will not then work. These cookies do not store any personally identifiable information.