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    <p>I don't know why you'd want to do this - why not just add the property <em>before</em> you stringify it?</p> <p>But if you must, given a string that contains JSON:</p> <pre><code>var myJSON = '{"prop1":"val1","prop2":"val2"}'; </code></pre> <p>You can easily add a property to the beginning by doing this:</p> <pre><code>myJSON = '{' + '"sn":"1",' + myJSON.substr(1); </code></pre> <p>Or add it to the end:</p> <pre><code>myJSON = myJSON.replace(/}$/, ',"sn":"1"' + '}'); </code></pre> <p>Or use whatever other combination of <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String" rel="nofollow">String</a> manipulation functions takes your fancy...</p> <p>If you want to add the new property in a specific place within the string, say inside a nested object or array or something, well, again some kind of regex or combination of <code>.indexOf()</code> and <code>.substr()</code> or something could do it, but really I think it's nuts to approach it this way.</p> <p>Obviously the above code can be wrapped up in a function, and <code>'"sn":"1"'</code> can be replaced with a parameter or variable name or whatever - but <em>why</em>?</p> <p>Note also that I've assumed above that there will be at least one existing property and inserted a comma accordingly- up to you to make that smarter if you want to allow for empty objects.</p> <p>P.S. There aren't "JSON strings" and "JSON objects": <em>all</em> JSON is a string. In JavaScript one way of creating objects is with the object literal syntax that inspired JSON, but there's no such thing as a JSON object.</p>
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    1. POHow could I add new property into a JSON string in JavaScript?
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    1. COSorry I did not point out the reason that I want to do this. The thing is I need to figure out the length of the JSON text before adding a new attribute/element to it. But...as you point out, i still can stringfy --> get the length --> de-stringfy -- adding a new attribute/element --> stringfy it. Thanks a a lot!
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    2. COIn that case you don't need to de-stringify: you've still got a reference to the original object so just add the property and stringify again.
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