Getting a null response from the JSON data

In a recent discussion on Stack Overflow, I encountered an issue while trying to extract a specific name from a JSon file named winners.json. The structure of the file resembles this:

    {"driver":[
      {
        "Year":1984,
        "Name":"Name1",
      },
      {
        "Year":1985,
        "Name":"Name2",
      },
    [and so forth...]
    ]}

Within my JavaScript file, I am utilizing a slider feature to select a year that corresponds to the data in the JSon file. Despite confirming that the selected value is of type "number" through console logs, I am facing difficulties retrieving the corresponding "Name" field due to unexpected issues with the "Year" field:

    var len=winners.winner.length;
    console.info(len + " values in JSon");
    for (var i=0; i < len; i++) {
        console.info("Reading line " + i + " Type: " + typeof(winners.winner[i].Year) + " Year: " + winners.winner[i].Year);
        [additional code...]
    }

While the variable len is being read correctly, attempts to resolve the issue by casting Number(winners.winner[i].Year) have resulted in NaN errors.

Your insights and assistance are greatly appreciated.

Answer №1

If your code resembles the example below:

var jsondata = '{"winner":[ { "Year":1984, "Name":"Name1" }, { "Year":1985, "Name":"Name2" }]';

console.info(jsondata.length)     

for (var i=0; i < len; i++) {
   console.info("Reading line " + i + " Type: " + typeof(jsondata.winner[i].Year) + " Year: " +
   winners.winner[i].Year);
}

In this case, the len variable will not represent the number of array elements in your JSON data, but rather the number of characters in the string. To convert the JSON string into a JavaScript object, as @Nirk pointed out, you need to use JSON.parse(jsondata);.

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