Sorting object indices in JavaScript can be a powerful tool for organizing and managing your data. It allows you to re-order the properties of an object based on specific criteria, making it easier to access and manipulate the data within the object. Here are some techniques for sorting object indices in JavaScript:

1. Using Object.keys() method: One way to sort object indices in JavaScript is to use the Object.keys() method to extract the keys of the object into an array. You can then use the array sorting methods like sort() to sort the keys and then loop through the sorted keys to access the corresponding values in the object.

2. Using Array.prototype.sort() method: Another technique is to use the Array.prototype.sort() method directly on the keys array obtained from the object. This method allows you to define a custom sorting function to sort the keys based on specific criteria, giving you full control over the sorting process.

3. Using an auxiliary array: You can also create an auxiliary array to store the keys of the object and then sort this array based on specific criteria. Once the keys are sorted, you can use them to access the corresponding values in the object in the desired order.

4. Sorting by value: In some cases, you may want to sort object indices based on the values of the properties rather than the keys themselves. You can achieve this by first extracting the key-value pairs into an array, sorting the array based on the values, and then reconstructing the object using the sorted key-value pairs.

In summary, sorting object indices in JavaScript can be achieved using various techniques such as using Object.keys(), Array.protoype.sort(), auxiliary arrays, and sorting by value. By mastering these techniques, you can effectively organize and manage your data within objects, making it easier to work with and manipulate the data in your JavaScript programs.