How to Capture Console Errors and Network Requests in JavaScript

When a user reports a bug, the information you actually need is already gone. The console error that triggered it fired three page loads ago. The failed network request happened before they even thought to open a ticket. The fix is to capture this data continuously — from page load, not from the moment the user clicks "report a bug". Here's how to build that from scratch. Intercepting console.error The browser's console object is just a plain JavaScript object. Its methods are writable, which me