Convert JSON string to an array in JavaScript - Stack Overflow

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I'm using jqPlot to create a chart. The data points for the chart e from a JSON object which is built using GSON. The chart data points are built in a JavaScript array format, so the Java object that holds the data to send to the client stores the data as follows:

String chartDataPoints = "[[1352128861000, 0.0], [1352128801000, 0.0], [1352128741000,   0.0], [1352128681000, 0.0], [1352128621000, 0.0],...More chart points in this format ,[[x0,y0], [x1,y2]...]]";

The x points are dates.

Is it possible to pass this data straight from the JSON object as though it is a JavaScript array? Currently MyJsonObject.chartDataPoints is treated as a String, and so jqPlot ($.jqplot ('chart1', MyJsonObject.chartDataPoints) doesn't plot anything.

I'm using jqPlot to create a chart. The data points for the chart e from a JSON object which is built using GSON. The chart data points are built in a JavaScript array format, so the Java object that holds the data to send to the client stores the data as follows:

String chartDataPoints = "[[1352128861000, 0.0], [1352128801000, 0.0], [1352128741000,   0.0], [1352128681000, 0.0], [1352128621000, 0.0],...More chart points in this format ,[[x0,y0], [x1,y2]...]]";

The x points are dates.

Is it possible to pass this data straight from the JSON object as though it is a JavaScript array? Currently MyJsonObject.chartDataPoints is treated as a String, and so jqPlot ($.jqplot ('chart1', MyJsonObject.chartDataPoints) doesn't plot anything.

• javascript
• arrays
• json
• string
• jqplot

Share Improve this question Follow edited Dec 27, 2012 at 19:56 Peter Mortensen 31.6k2222 gold badges110110 silver badges133133 bronze badges asked Nov 5, 2012 at 15:52 sardosardo 2,85133 gold badges2020 silver badges1818 bronze badges 1

• It should be noted that the definition of JSON is "String representation of javascript array or object". – slebetman Commented Nov 5, 2012 at 16:03

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3 Answers 3

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One option is to use eval:

var arr = eval('(' + json_text + ')');

The above is easiest and most widely supported way of doing this, but you should only use eval if you trust the source as it will execute any JavaScript code.

Some browsers have a native JSON parser in which case you can do the following:

var arr = JSON.parse(json_text);

Third-party libraries such as jQuery can also provide functions for dealing with JSON. In jQuery, you can do the following:

var arr = jQuery.parseJSON(json_text);

The bottom two methods (which use a parser) are preferred as they provide a level of protection.

If you remove the quotation marks, that is a valid array declaration. Then you could cycle through the array converting the x points to dates.

Take a look at: https://github./douglascrockford/JSON-js

There's a method to parse the string into an object, which is a "safe" method - You can just do an eval(chartDataPoints) in your javascript, however it's always remended that you parse it through a JSON engine in case there's some bad things in there!

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