Parse JSON into Object Array

Question

I have created an array that contains objects, some of the properties are also objects. I have converted it to JSON successfully and need to convert it back into an array of the objects, or somehow pull the correct data from the correct index of the JSON object.

Update

This is a sample of what I get when I run it through JSON.parse:

[{"Result":"Fail","Method":"T97E-v1","Beam1":{"BeamAge":"1","WidthUpper":1,"WidthCenter":1,"WidthLower":1,"WidthAverage":1,"DepthRight":1,"DepthCenter":1,"DepthLeft":1,"DepthAverage":1,"MaxLoad":1,"FS":18,"PSI":"18.00000","BreakOutside":"No"},"Beam2":{"BeamAge":"","WidthUpper":null,"WidthCenter":null,"WidthLower":null,"WidthAverage":null,"DepthRight":null,"DepthCenter":null,"DepthLeft":null,"DepthAverage":null,"MaxLoad":null,"FS":null,"PSI":"NaN"},"WaitForCuring":"No","AverageOfBeams":"NaN"}]

Update 2

Here is the code around what I'm doing:

try {
 localStorage["flexuralStrengthSamples"] = JSON.stringify(JSON.stringify(t97Samples));
 var parsedObject = JSON.parse(localStorage["flexuralStrengthSamples"]);
 console.log(parsedObject); 
 console.log(parsedObject[0].Beam1.MaxLoad); 
} catch (err) {
 alert(err.message);
}

• MorKadosh: Ok, but what about some data example? or maybe some code youv'e tried already? stack is not a place to ask for code, but to ask concrete questions.
• Luca Marzi: Maybe if you tell about the language you're using you can help us to help you. If you're using javascript the problem doesn't exist because JSON is the string serialization of a javascript object. So with the JSON.parse you should be OK.
• Cody Harness: @PanamaJack I've had nothing but failed and broken code. I update to show what I get when parsing the JSON.
• Panama Jack: What is your expected outcome? Explain exactly what result you are expecting.
• Grundy: @CodyHarness, why you do stringify twice? one is enough. Also simple logic: if you twice convert to string, so and parse you also should twice. But anyway, enough call stringify once

Answer 1

I figured out the reason: You are stringyfying twice before storing it in localstorage

try {
 localStorage["flexuralStrengthSamples"] = (JSON.stringify(t97Samples)); //Stringify only once, since localstorage values needs to be string
 var parsedObject = JSON.parse(localStorage["flexuralStrengthSamples"]); // should give the original object.
 console.log(parsedObject[0].Beam1.MaxLoad); // Since parsedObject is still string, this was failing. Now should work fine 
} catch (err) {
 alert(err.message);
}

See the working fiddle here: http://jsfiddle.net/sandenay/pnb88p4s/

Answer 2

You can parse JSON using JSON.parse().

Update
Here is a sample of your data from JSON.parse().

[{"Result":"Fail","Method":"T97E-v1","Beam1":{"BeamAge":"1","WidthUpper":1,"WidthCenter":1,"WidthLower":1,"WidthAverage":1,"DepthRight":1,"DepthCenter":1,"DepthLeft":1,"DepthAverage":1,"MaxLoad":1,"FS":18,"PSI":"18.00000","BreakOutside":"No"}}]

In order to get at your data, you need to use bracket-notation for arrays and dot-notation for objects. So, let data be equal to that JSON Array, then you can do data[0].Result, which is "Fail", or data[0].Beam1.MaxLoad, which is 1.

• Cody Harness: I've tried that. It always gives me the error "Cannot read property 'MaxLoad' of undefined."
• OneCricketeer: data[0].Beam1.MaxLoad prints 1 in the console for me
• Cody Harness: I added my code. It seems anyone on this question and any others that I've been to can get output, but I never can.