This article details the creation of a website technology detection API as a side project to solve the author's frustration with inaccurate and unreliable existing tools. The process involved gathering signals like HTML content, JavaScript global variables, HTTP headers, and DNS records to detect technologies such as React, WordPress, and more. A freemium pricing model was implemented, offering tiers based on request volume from 100 free requests/month to custom enterprise plans. Key lessons learned include prioritizing reliability over features initially, the importance of caching for performance and cost efficiency, implementing rate limiting early, and providing clear error messages as a feature. The API now handles over 50,000 requests monthly with high uptime, demonstrating that solving personal frustrations can lead to valuable developer tools.
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