CODEWITHSUNDEEP
javascriptjsonparsing
Andriy Sambir
Andriy Sambir

Reputation: 87

JSON.stringify and JSON.parse get different result

I have an Object I use JSON.stringify to create JSON string. Than I save that string into file. Then I read that file. Make JSON.parse and try to use that object again. But it does not work anymore. For example if I use [i] to select element it doesnt select element but just take charset like its a string :(

Can any body help with that?

This is some kind of example but actuall JSON is toooo long:

{"featureCollection":
{"layers":"[
    {\"layerDefinition\": 
        {\"currentVersion\": 10.3,
                         \"id\": 0, 

                                     \"supportsCoordinatesQuantization\": true,
                                     \"advancedQueryCapabilities\": 
                                     {  
                                        \"supportsPagination\": true,

                                        \"supportsDistinct\": true
                                    }, 
                                    \"geometryType\": 
                                        \"esriGeometryPolygon\", \"minScale\": 0,
                                        \"maxScale\": 0,
                                        \"extent\": 
                                            {},
                                        \"drawingInfo\":
                                            {\"renderer\": 
                                                {\"type\": \"simple\", \"symbol\": 
                                                    {\"type\": \"esriSFS\", \"style\": \"esriSFSSolid\", \"color\": [76, 129, 205, 191], \"outline\": 
                                                        {\"type\": \"esriSLS\", \"style\": \"esriSLSSolid\", \"color\": [0, 0, 0, 255], \"width\": 0.75}
                                                    }
                                                },

Upvotes: 2

Views: 482

Answers (2)

Barmar
Barmar

Reputation: 780879

What's going on is that the layers property of the featureCollection property is not an array, it's a JSON encoding of an array. You need to decode it again to process the contents. Assuming json_obj is the full object, you need to do:

var layers = JSON.parse(json_obj.featureCollection.layers);

Then you can access layers[i].layerDefinition.currentDefinition.

I don't know why it's done that way -- you may want to fix the code that creates the JSON in the first place, and remove the part that calls JSON.stringify() when storing into the layers property.

Upvotes: 4

Rob M.
Rob M.

Reputation: 36511

It looks as though the process that is writing the JSON string to a file is escaping the quotes which is causing the issues when you try to parse. You either need to stop the process from escaping the quotes, or use replace to strip out the escaped quotes of your JSON string prior to passing it to parse

Upvotes: 0

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