Building a Serverless SEO Metadata Analyzer at the Edge

The article describes building a lightweight, serverless SEO metadata analyzer deployed on edge infrastructure (e.g., Cloudflare Workers) that uses the HTMLRewriter streaming API to extract key on-page SEO elements—title tags, meta descriptions, canonical URLs, and header hierarchies—without loading a full DOM. The tool returns a structured JSON response with SEO metrics and warnings, enabling fast, scalable analysis of how search engine crawlers perceive web pages.