How to read and write an external local JSON file in JavaScript?-CodePudding

I have a JSON file and I can change the value of "src" and "composition" but I can not change the value of actions/postrender/second output value.

I am using this js

file.template.src = "value1";
file.template.composition= "value2";
file.actions.postrender.output= "value3";

{
    "template": {
        "src": "value1",
        "composition": "value2"
    },
    "actions": {
        "postrender": [
            {
                "module": "@nexrender/action-encode",
                "preset": "mp4",
                "output": "encoded.mp4"
            },
            {
                "module": "@nexrender/action-copy",
                "input": "encoded.mp4",
                "output": "d:/mydocuments/results/myresult.mp4"
            }
        ]
    }
}

CodePudding user response：

file.actions.postrender.output= "value3"; Doesn't work because postrender is an array.

You need to specify which element you want to modify (0 for the first element, or 1 for the second element):

file.actions.postrender[0].output= "value3";
file.actions.postrender[1].output= "value3";

CodePudding user response：

Thats because you are not selecting the second element in the array. Use the index operator to first get the second element and then modify the value:

file.actions.postrender[1].output= "value3";

CodePudding user response：

It is because te value of the key "postrender" is an array.

To update the key "output" of an element of the array you should select which element, for example:

file.actions.postrender[0].output= "value3";

If you want to update all of the elements you could use a for loop.