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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 Programmatic webhooks Email page views Tag statistics Discord webhook formatting Automatic subscriber cleanup RSS subscriber count Weekly subscriber reports More list columns Customizable list views How Max Voltar turned a side gig into a trusted keyboard resource How Nick Disabato runs two newsletters from one design consultancy Made-for-you share images Automation improvements End-of-email surveys Filter by date Survey-triggered automations More automation functionality New webhooks How France Insider built a news service with paid subscribers Email as primary key How John Willshire unites two businesses in one newsletter Confirmation reminders Email churned subscribers Email-to-draft Subscriber metadata columns ChatGPT integration Faster web archives Referral program Better search results TikTok embeds Subscriber timeline Spotify embeds Improved RSS-to-email Subscribe page OG image New analytics page Google Tag Manager Even more subscriber types Integrating Duda with Buttondown Linktree integration guide Advanced and enterprise plans Framer integration guide API requests page Team collaboration In-email surveys Better CSS settings Better RSS automation fetching! Editor toolbar improvements Smart filters Faster emails page RSS automations Faster email analytics Zapier error codes Image accessibility checks Tags vs newsletters OG image picker Image editor improvements API bulk actions Improved OpenAPI spec Mastodon support Better subscriber filtering Better subscriber validation Hotkey support! Programmatic access to analytics Stronger bulk actions Faster archive page Custom canonical URLs Email slug and metadata Improved writing interface Generating a Typescript router in Django Filter emails by source
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!