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Buttondown's blog

Email could have been X.400 times better The physicists who convinced Fermilab to send Brazil's emails Better in-app previews Analytics 3.0 Subscriber ID variables Comments! Send latest premium action Automation filtering Free API subscribers Surveys in automations Reply to replies Labels for RSS feeds How Jeremy Singer-Vine curates curious datasets for readers 2023 (and what's next) Email vs web content Sort by engagement Better gift subscriptions How Andy Dehnart built a career reviewing television New email template Email-based automations Opt-in reply tracking Automatic alt text More social network integrations Sort by metadata Overlarge image warnings Automation tag actions Pause emails mid-flight Search tags and automations Gift via automations Subscriber-driving emails
Better API errors
Justin Duke · 2025-08-22 · via Buttondown's blog

demo.buttondown.com/requests/<id>

Hey there! We've shipped some quality-of-life improvements to make debugging API issues a breeze — or, if not a breeze, at least incrementally more pleasant.

First up, we've polished the API requests dashboard with a bunch of nice grace notes, including deep links into the relevant emails and subscribers associated with each request.

But here's the real treat: we've launched a comprehensive (and overdue) API error codes reference! If you've ever scratched your head wondering what email_invalid or subscriber_already_exists actually means (and more importantly, how to fix it), this new documentation page (and the concomitant sections at the end of every API endpoint) has you covered.

Small touches like these might not be flashy, but they make working with Buttondown's API that much smoother. Happy debugging!