Running raw javascript (from plain text)

Question

I'm trying to execute JavaScript from plain text (from being entered by a client). I also need a way to see if the executed code works or not (if it does, then it does, otherwise, it needs to spit out a non-variable error message).

Thanks if you can! The stuff that will be executed would be short strings such as:

echo("a","b")

Answer 1

You can use eval and wrap around try-catch.

try
  {
    eval(code);
  }
catch(err)
  {
  //Handle errors here
  }

Answer 2

Are you saying you just need a try/catch statement?

https://developer.mozilla.org/en/JavaScript/Reference/Statements/try...catch