How to remove a character in json at specific index using js?

Question

I have a json code as below:

[  
   [  
      {  
         "title":"Shirt Front",
         "thumbnail":"http://ipadd/pub/media/catalog/product//b/l/blue-back_2.jpg",
         "elements":[  
            {  
               "type":"image",
               "source":"http://ipadd/pub/media/catalog/product//b/l/blue-back_2.jpg",
               "title":"Base",
               "parameters":{  
                  "left":325,
                  "top":329,
                  "colors":"#d59211",
                  "price":20,
                  "colorLinkGroup":"Base",
                  "fill":false
               }
            }
         ]
      },
      {  
         "title":"Shirt Front",
         "thumbnail":"http://ipadd/pub/media/catalog/product//b/l/blue-back_1_1.jpg",
         "elements":[  
            {  
               "type":"image",
               "source":"ipadd/pub/media/catalog/product//b/l/blue-back_1_1.jpg",
               "title":"Base",
               "parameters":{  
                  "left":325,
                  "top":329,
                  "colors":"#d59211",
                  "price":20,
                  "colorLinkGroup":"Base",
                  "fill":false
               }
            }
         ]
      },

   ]
]

I need to remove the comma at the end of array ie. the comma before the last two characters of the json. Due to this the above json is a invalid json. I need to achieve this using JS.

Is this a string, or JS source code? You could eval it and re-encode it with JSON.stringify. — mpen
– mpen, Commented Aug 25, 2019 at 18:48
Remove it at the point it's generated. Doing this in JS after receiving the JSON is a hacky workaround. — Rory McCrossan
– Rory McCrossan, Commented Aug 25, 2019 at 18:50

Todd Chaffee · Accepted Answer · 2019-08-25 18:53:37Z

Here is another approach, assuming your input is a string. It finds the last index of a comma in the string, and then uses string.splice to assemble a new string without that comma.

const JSON = `[  
   [  
      {  
         "title":"Shirt Front",
         "thumbnail":"http://ipadd/pub/media/catalog/product//b/l/blue-back_2.jpg",
         "elements":[  
            {  
               "type":"image",
               "source":"http://ipadd/pub/media/catalog/product//b/l/blue-back_2.jpg",
               "title":"Base",
               "parameters":{  
                  "left":325,
                  "top":329,
                  "colors":"#d59211",
                  "price":20,
                  "colorLinkGroup":"Base",
                  "fill":false
               }
            }
         ]
      },
      {  
         "title":"Shirt Front",
         "thumbnail":"http://ipadd/pub/media/catalog/product//b/l/blue-back_1_1.jpg",
         "elements":[  
            {  
               "type":"image",
               "source":"ipadd/pub/media/catalog/product//b/l/blue-back_1_1.jpg",
               "title":"Base",
               "parameters":{  
                  "left":325,
                  "top":329,
                  "colors":"#d59211",
                  "price":20,
                  "colorLinkGroup":"Base",
                  "fill":false
               }
            }
         ]
      },

   ]
]`

lastComma = JSON.lastIndexOf(',')

const JSONnew = JSON.slice(0, lastComma) + JSON.slice(lastComma + 1, JSON.length)

console.log(JSONnew)

stpoa · Accepted Answer · 2019-08-25 18:50:49Z

You can use eval, but know that it is dangerous, this code is valid JavaScript

const json = `[  
   [  
      {  
         "title":"Shirt Front",
         "thumbnail":"http://ipadd/pub/media/catalog/product//b/l/blue-back_2.jpg",
         "elements":[  
            {  
               "type":"image",
               "source":"http://ipadd/pub/media/catalog/product//b/l/blue-back_2.jpg",
               "title":"Base",
               "parameters":{  
                  "left":325,
                  "top":329,
                  "colors":"#d59211",
                  "price":20,
                  "colorLinkGroup":"Base",
                  "fill":false
               }
            }
         ]
      },
      {  
         "title":"Shirt Front",
         "thumbnail":"http://ipadd/pub/media/catalog/product//b/l/blue-back_1_1.jpg",
         "elements":[  
            {  
               "type":"image",
               "source":"ipadd/pub/media/catalog/product//b/l/blue-back_1_1.jpg",
               "title":"Base",
               "parameters":{  
                  "left":325,
                  "top":329,
                  "colors":"#d59211",
                  "price":20,
                  "colorLinkGroup":"Base",
                  "fill":false
               }
            }
         ]
      },

   ]
]`

const validJsArray = eval(json)

Gavin · Accepted Answer · 2019-08-25 18:50:14Z

JSON.stringify will clean that up for you.

var my_cool_object = [
        [
            {
                "title": "Shirt Front",
                "thumbnail": "http://ipadd/pub/media/catalog/product//b/l/blue-back_2.jpg",
                "elements": [
                    {
                        "type": "image",
                        "source": "http://ipadd/pub/media/catalog/product//b/l/blue-back_2.jpg",
                        "title": "Base",
                        "parameters": {
                            "left": 325,
                            "top": 329,
                            "colors": "#d59211",
                            "price": 20,
                            "colorLinkGroup": "Base",
                            "fill": false
                        }
                    }
                ]
            },
            {
                "title": "Shirt Front",
                "thumbnail": "http://ipadd/pub/media/catalog/product//b/l/blue-back_1_1.jpg",
                "elements": [
                    {
                        "type": "image",
                        "source": "ipadd/pub/media/catalog/product//b/l/blue-back_1_1.jpg",
                        "title": "Base",
                        "parameters": {
                            "left": 325,
                            "top": 329,
                            "colors": "#d59211",
                            "price": 20,
                            "colorLinkGroup": "Base",
                            "fill": false
                        }
                    }
                ]
            },
        ]
    ];
    var valid_json_string = JSON.stringify(my_cool_object);

Wang Liang · Accepted Answer · 2019-08-25 18:52:00Z

0

var json = [ ...  ]
console.log(JSON.parse(JSON.stringify(json)));

answered Aug 25, 2019 at 18:52

Wang Liang

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