Developer Builds Gemini Chat-to-Spreadsheet Chrome Extension Using AI as Co-Coder

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A developer known as Shin set out to automatically save useful Gemini AI conversations to a Google Spreadsheet, prompting him to build a custom Chrome extension with Gemini's help. To avoid AI guesswork, he explicitly instructed Gemini not to assume webpage structure and instead ask for the actual HTML elements it needed. Using Chrome DevTools, Shin extracted the relevant HTML from Gemini's interface and fed it directly to the AI, which then generated precise JavaScript to target those elements. The resulting extension successfully wrote conversation data to a spreadsheet in the background during live Gemini chats. This is the first part of a four-part series documenting his AI-assisted development process and the thinking behind building and maintaining such tools independently.

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