A very interesting presentation from Nicholas C. Zakas named “Enterprise JavaScript Error Handling (Ajax Experience 2008)”, worth to read.

I am collecting application development best practices for quite a long time, and after studying slides from this brilliant presentation my “Error Handling” part increased. Some day I will publish a full list, but now just “Error Handling” part as a very short summary of presentation.

• Assume your code will fail.
• Log errors.
• Provide a debug mode.
• Don’t tell the user application is not working unless absolutely necessary.
• Recovery from error if it is possible if not than message the user immediately.