Error validating execution rights for agent

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This is one of the main reasons why libraries like j Query came into existence — to abstract away differences in browser implementations (e.g.see the code snippet in How to make an HTTP request) so developers only have to write one simple bit of code (see ).Now we'll look at common cross-browser Java Script problems and how to fix them.

If you look at the console, you'll see the following output: The error message reads "Type Error: json Obj is null", and the line number signified is line 37.

For example, see the "Plugins for text editors and IDEs" section of the JSHint install page.

There are other ways to use such linters; you can read about them on the JSHint and ESLint install pages.

Let's investigate this now, using a more sophisticated feature of browser developer tools: the Java Script debugger as it is called in Firefox.

The main feature of such tools is the ability to add breakpoints to code — these are points where the execution of the code stops, and at that point you can examine the environment in its current state and see what is going on. First of all, we know that the error is being thrown at line 51.

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