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copied!<h2>Parsing a number</h2> <p>You can better handle the parsing of numbers using <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt"><code>parseInt()</code></a>. It will return a number on success and <code>NaN</code> (Not a Number) otherwise. </p> <pre><code>var a = parseInt('23'); isNan(a); // false var b = parseInt('ab'); isNan(b); // true </code></pre> <h2>Why it returns 1 in jQuery</h2> <p>If you have a look at the source of the jQuery method it will become clear very quickly.</p> <ol> <li>It will check if there is native support for JSON.parse.</li> <li>If not, it will create an anonymous function (with string body) that simply returns the data contained in the JSON string and calls it.</li> </ol> <p>So if in your case step <code>2.</code> is executed it will simply return <code>1</code> even though it's not real JSON.</p> <p><strong>UPDATE:</strong> I was curious how the native <code>JSON.parse</code> <a href="http://jsfiddle.net/bTmgw/">would handle it</a> and it does the same thing (returning <code>1</code>). So regardless of the implementation you always get the same result.</p> <p>Library on display: <a href="http://code.jquery.com/jquery-1.8.3.js">http://code.jquery.com/jquery-1.8.3.js</a></p> <pre><code>parseJSON: function( data ) { if ( !data || typeof data !== "string") { return null; } // Make sure leading/trailing whitespace is removed (IE can't handle it) data = jQuery.trim( data ); // Attempt to parse using the native JSON parser first if ( window.JSON && window.JSON.parse ) { return window.JSON.parse( data ); } // Make sure the incoming data is actual JSON // Logic borrowed from http://json.org/json2.js if ( rvalidchars.test( data.replace( rvalidescape, "@" ) .replace( rvalidtokens, "]" ) .replace( rvalidbraces, "")) ) { return ( new Function( "return " + data ) )(); // Just returns JSON data. } jQuery.error( "Invalid JSON: " + data ); }, </code></pre>

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