Debugging Malformed JSON Responses from Email Send APIs: Signup Verification Links
Short answer: To debug a malformed JSON response from an email send API, capture the raw response before parsing it, classify the HTTP status and content type separately, and leave the signup pending when acceptance is uncertain. A malformed JSON response from an email send API is usually a boundary problem, not an email deliverability problem. For a B2B SaaS signup flow, first preserve the raw HTTP response, then classify the failure before changing the verification-link code. That keeps a bad…