JavaScript has become a language that every web developer must be deeply familiar with to build web applications, and it will even be heavily used in creating client applications for the upcoming Windows 8 operating system from Microsoft. The following sites will help you produce better, error-free JavaScript which is important if you want to maintain customer confidence over your products.

    This site can be considered a sandbox for JavaScript. You can write code in HTML, CSS, and of course, JavaScript and run, test, and tidy up the code with automated tools.
  2. JSHINT (
    Debugging tool for JavaScript and enforcing coding conventions. More powerful that JSLINT.
  3. JSONLint (
    Specialized tool for validating JSON.
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