JavaScript Fetch API Hooking: A Comprehensive Guide

You can use the following code to hook the built-in fetch object in JavaScript:

const originalFetch = window.fetch;

window.fetch = function() {
  // Your code here
  return originalFetch.apply(this, arguments);
};

In the above code, we first save the original fetch function, then replace window.fetch with a new function. In the new function, you can add your own code to hook the behavior of fetch. Finally, we call the original fetch function and return its result.

Note that this only works for cases where the global fetch object is used. If your code uses a local fetch object, you need to hook it to the local variable.