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POHow to parse JSON string containing "NaN" in Node.js
 

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  1. POHow to parse JSON string containing "NaN" in Node.js
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    <p>Have a node.js app that is receiving JSON data strings that contain the literal NaN, like</p> <pre><code> "[1, 2, 3, NaN, 5, 6]" </code></pre> <p>This crashes <code>JSON.parse(...)</code> in Node.js. I'd like to parse it, if i can into an object.</p> <p>I know <code>NaN</code> is not part of JSON spec. Most SO links (<a href="https://stackoverflow.com/questions/6601812/sending-nan-in-json">sending NaN in json</a>) suggest to fix the output.</p> <p>Here, though the data is produced in a server I don't control, it's by a commercial Java library where I can see the source code. And it's produced by Google's Gson library:</p> <pre><code>private Gson gson = (new GsonBuilder().serializeSpecialFloatingPointValues().create()); ... gson.toJson(data[i], Vector.class, jsonOut) </code></pre> <p>So that seems like a legitimate source. And according to the <a href="http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/GsonBuilder.html#serializeSpecialFloatingPointValues%28%29" rel="nofollow noreferrer">Gson API Javadoc</a> it says I should be able to parse it:</p> <blockquote> <p>Section 2.4 of JSON specification disallows special double values (NaN, Infinity, -Infinity). However, Javascript specification (see section 4.3.20, 4.3.22, 4.3.23) allows these values as valid Javascript values. Moreover, most JavaScript engines will accept these special values in JSON without problem. So, at a practical level, it makes sense to accept these values as valid JSON even though JSON specification disallows them.</p> </blockquote> <p>Despite that, this fails in both Node.js and Chrome: <code>JSON.parse('[1,2,3,NaN,"5"]')</code></p> <p><strong>Is there a flag to set in JSON.parse()? Or an alternative parser that accepts <code>NaN</code> as a literal?</strong></p> <p>I've been Googling for a while but can't seem to find a doc on this issue. </p> <p><a href="https://stackoverflow.com/questions/13581843/php-how-to-encode-infinity-or-nan-numbers-to-json/13582033#13582033">PHP: How to encode infinity or NaN numbers to JSON?</a></p>
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    1. COI find it ironic that Google's Gson project says that JSON parsers should allow these literals, while the JavaScript engine that's not tolerating them is Google's own V8.
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    2. CO@cdhowie node's JSON parser simply follows the spec. The "irony" is just a violation of [the robustness principle.](http://en.wikipedia.org/wiki/Robustness_principle)
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    3. CO@MattBall No, the irony is that one Google project says that *"most JavaScript engines will accept these special values in JSON without problem"* while Google's JavaScript engine is one of the exceptions as evidenced by the fact that Chrome doesn't like the string either.
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