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Puppeteer prerendering localStorage leak across React routes causes SEO bugs

What happened

A developer building a Vite SPA encountered a critical bug where Puppeteer prerendering was causing localStorage data to leak between React routes. The issue was discovered while implementing SEO optimization for dev utilities. The localStorage contamination was persisting across different routes during the prerendering process, creating unpredictable application state.

Business impact
SEO prerendering failures can directly impact organic search visibility and revenue. State contamination between routes creates inconsistent user experiences that are difficult to reproduce and debug in production.
What this means for your team
QA teams should specifically test prerendering workflows with localStorage state isolation between routes. Include localStorage cleanup verification in your automated testing suite when using SSG or prerendering tools with SPAs.
Sources
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