eval - JavaScript syntax check with JavaScript? - Stack Overflow

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How could a Commando like me check if inputed code is a valid JavaScript source using some JavaScript built-in methods (if any!) or in any other possible way!? (Something like a preparser found in various IDE's like NetBeans, Eclipse, etc)?

I have to check if code is OKAY and then window.eval()-it to the current document instance.

How could a Commando like me check if inputed code is a valid JavaScript source using some JavaScript built-in methods (if any!) or in any other possible way!? (Something like a preparser found in various IDE's like NetBeans, Eclipse, etc)?

I have to check if code is OKAY and then window.eval()-it to the current document instance.

• javascript
• eval
• syntax-checking

Share Improve this question Follow edited Oct 22, 2022 at 19:34 pppery 3,8142525 gold badges3737 silver badges5050 bronze badges asked Aug 18, 2011 at 13:41 user798596user798596 1

• What do you mean by 'Okay'? whether the code should have correct syntax or should be following coding standards or should not contain malicious code? – sv_in Commented Aug 18, 2011 at 14:46

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3 Answers 3

Sorted by: Reset to default 5

Assuming that your need is to check whether the code will not throw any syntax errors, following is my solution:

var code = "asdfsd = 1";

try {
    (function(){
        new Function(code);
    })()
}
catch(e) {
    alert('error');
}

Working Example: http://jsfiddle/5NpGa/

You could use a lint library like:

http://www.javascriptlint./download.htm

EDIT:

Sorry, that's a piled linter and you're wanting something for on-the-fly. Try jslint: http://jslint.

You're looking for Crockford's jslint.js. It's the same code that powers http://jslint./.

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