Silent Automation Failures: Reading Chrome's Cookie DB to Verify Login State
A developer discovered that an Instagram auto-like bot had been silently failing for days, logging 'complete' with exit code 0 while performing zero actions. The root cause was a logged-out session on one account, but the job's DOM-based login detection was fooled because Instagram's logout screen still contains a 'main' HTML element. The existing check looked for visual signs of a login page rather than verifying actual authentication state. The fix involved reading Chrome's SQLite cookie database directly, where the presence of Instagram's 'sessionid' cookie for the instagram.com domain reliably confirms login status regardless of UI changes. This approach shifts login detection from fragile DOM pattern-matching to observing a ground-truth authentication fact, applicable to any Chromium-based browser automation tool.
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