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Netlify parses application/json automatically, but a plain HTML form sends application/x-www-form-urlencoded. Use event.body and querystring to decode it. Beginners often try JSON.parse(event.body) and get an error – remember the format.
For security, validate the email again on the server side before proceeding. In production you would also add rate‑limiting or a CAPTCHA, but for this beginner course a simple regex suffices.
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