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Assuming you are referring to inserting data into an array in jQuery, you can use the unshift() method to add data to the beginning of an array with an index of 0.
For example, if you have an array called myArray with existing data and you want to insert a new value at the beginning with an index of 0, you can use the unshift() method like this:
var myArray = [2, 3, 4];
myArray.unshift(1);
console.log(myArray); // output: [1, 2, 3, 4]
In this example, the unshift() method adds the value of 1 to the beginning of the myArray array, shifting all existing values to the right. The resulting array has an index of 0 for the first value.