json.parse array of objects

stackoverflow.com › questions › 11468806 › json-parse-for-array-of-object

This works perfectly

    function myFunction(dataFromServer){
       var parsedJSON = JSON.parse(dataFromServer.d);
       for (var i=0;i<parsedJSON.length;i++) {
            alert(parsedJSON[i].Id);
       }
    }

But this doens't

    function myFunction(dataFromServer){
        var parsedJSON = JSON.parse(dataFromServer.d);
        for (var item in parsedJSON) {
            alert(item.Id);
        }
    }

Answer from user266003 on Stack Overflow

Stack Overflow

stackoverflow.com › questions › 11468806 › json-parse-for-array-of-object

JSON.parse for array of object - javascript

Top answer

1 of 5

This works perfectly

    function myFunction(dataFromServer){
       var parsedJSON = JSON.parse(dataFromServer.d);
       for (var i=0;i<parsedJSON.length;i++) {
            alert(parsedJSON[i].Id);
       }
    }

But this doens't

    function myFunction(dataFromServer){
        var parsedJSON = JSON.parse(dataFromServer.d);
        for (var item in parsedJSON) {
            alert(item.Id);
        }
    }

2 of 5

You can just access them as you would any object:

var id = item.Id;
if (item.IsGood) { ... }

If you wish to enumerate them to use somehow, have a look at this SO question.

JSON.parse result to proper array of objects

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JSON.parse to an object array

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More results from stackoverflow.com

reddit.com › r/learnprogramming › large array of objects in json for json.parse() in javascript

r/learnprogramming on Reddit: Large array of objects in JSON for JSON.parse() in JavaScript

March 10, 2020 -

I need to manually convert a csv file to JSON via code, and then parse it in JavaScript. Problem is I can't seem to figure out how to get it into a format that JSON.Parse() accepts

For example this format is considered invalid:

var parsedJson = JSON.parse([{"Field1" : "123", "Field2": "123"}, {"Field1" : "123", "Field2" : "123"}]);

I just get an invalid token o error.

My actual JSON has 3 columns, and the first one is used to identify the row. I was thinking of parsing the JSON and creating a dictionary with the first value as a key, and the 2nd and 3rd fields concatenated somehow as the value.

Can someone help?

Top answer

1 of 1

The issue is that JSON.parse takes a string; you're passing it an object literal. It's used for taking a string that contains JSON-formatted data and converting it into a JS object. But what you have here doesn't need to be parsed; you can just set a variable equal to it directly. Alternatively, wrap the entire contents inside JSON.parse() with single-quotes or back-ticks (the ` character). creating a dictionary with the first value as a key, and the 2nd and 3rd fields concatenated somehow as the value. Don't concatenate them; use objects.

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Large array of objects in JSON for JSON.parse() in JavaScript

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