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Ever feel like your morning coffee is just a bitter prelude to the real thrill — finding exposed API keys in JavaScript? No? Just me? Alright then. But that questionable caffeine kick did help me sniff out a hidden treasure: a forgotten React build with hardcoded secrets that unlocked a high-severity jackpot. Let me walk you through my adventure.

1. The Recon Ritual: Scanning JavaScript for Gold

I kicked things off with a standard recon setup:

subfinder -d target.com -silent > subs.txt
httpx -l subs.txt -silent -o live.txt
gau -subs target.com | grep ".js" | tee js_files.txt

Then I manually downloaded suspicious scripts and grepped for keywords like api_key, token, secret, etc.

That’s when I saw it: a minified JS file with a visible const API_KEY = "sk_live_abc123secret"; embedded in client-side code. My heartbeat went thump-thump. As others…