I Built an Amazon Auto-Search Chrome Extension in 5 Minutes With ChatGPT

A Tiny Idea Solved a Daily Friction

I often bounce between Rakuten, Yodobashi, and Yahoo! Shopping when comparing prices. Copying the product name and pasting it into Amazon every time felt like a tax on my attention. So I asked myself: could an extension grab the title and send me straight to the correct regional Amazon store?

ChatGPT (Codex) Wrote the Skeleton

I opened ChatGPT and sent one structured prompt: "Build a Chrome extension that detects product names on Rakuten, Yodobashi, and Yahoo! Shopping, then opens an Amazon search that matches the user's browser language. Please support both a toolbar button and a right-click menu." Within seconds I had code for manifest.json, content.js, and popup.html.

After minor tweaks--styling the popup and fine-tuning selectors--the extension was ready. No extra libraries, no guesswork.

Amazon Region AutoDetect: Key Features

• Auto-detects product names on supported shopping sites.
• Jumps to Amazon.co.jp, .com, .uk, or another storefront based on browser locale.
• Works via context menu or toolbar button.
• Zero tracking, no ads, lightweight code.

🔗 Install Amazon Region AutoDetect

What I Learned From Shipping It

Small annoyances make great prototypes. The moment you realize "I wish Amazon search was one click away," you have a user story. ChatGPT handled the boilerplate so I could stay focused on the behavior that mattered.

Now, whenever that familiar itch to automate something appears, I know I can ship a solution in minutes--not weeks.