Online Debugging Tools
Is a collaborative debugging tool allowing you to share and modify code snippets while chatting on IRC, IM or a message board.
2. JSON Formatter and Validator
The JSON Formatter was created to help with debugging. As data expressed as JSON is often written without line breaks to save space, it became extremely difficult to actually read it. This tool hopes to solve the problem by formatting the JSON into data that is easily readable by human beings.
Browser-based Debugging Tools
8. DebugBar – IE Extension for Web Developers
9. Opera Dragonfly