How Astro Sites Can Handle Form Submissions Without a Backend Server

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Astro, a framework popular for static, content-heavy websites, poses a challenge when developers need to handle form submissions without a server-side endpoint. A third-party service called onsubmit.dev allows Astro projects to send form data to an external endpoint, eliminating the need for a dedicated API route or server runtime. This approach keeps the site fully static and deployable to CDNs or platforms like GitHub Pages, while still accepting contact requests, feedback, or registrations. Developers can use plain HTML forms pointing to the external endpoint, meaning the form works even without JavaScript enabled. A key security reminder accompanies the approach: any credentials or API keys included in client-side code or generated HTML are publicly visible and must never be embedded there.

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