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You can sort a JSON object array in JavaScript based on its alphanumeric key attribute by using the sort() method in combination with a custom comparison function.

Here's an example code snippet:

const jsonArray = [
  { key: "ab123" },
  { key: "cd25" },
  { key: "ef789" }
];

jsonArray.sort((a, b) => {
  if (a.key < b.key) {
    return -1;
  }
  if (a.key > b.key) {
    return 1;
  }
  return 0;
});

In this example, the jsonArray object array is sorted based on the key attribute in an alphanumeric order. The sort() method takes a comparison function as a parameter, which compares the key attribute values of each object.

The comparison function checks the key value of a against the key value of b. If a.key is less than b.key, it returns -1, which indicates that a comes before b in the sorted array. If a.key is greater than b.key, it returns 1, which indicates that b comes before a in the sorted array. If a.key is equal to b.key, it returns 0, which indicates that both objects are equal and can be placed in any order.