Switching off API v1: third-party apps left to break

On 28 June 2016 Dropbox announced that API v1 — the original programming interface that an entire ecosystem of third-party apps, plugins, and integrations had been built on — was deprecated, and gave developers roughly a year to migrate to the newer API v2. After several timeline adjustments, the v1 endpoints were finally switched off on 28 September 2017, after which calls returned an error and integrations that had not migrated simply stopped working.

Because v2 was not a drop-in replacement, migration required real engineering effort: developers had to rework authentication and rewrite calls against a different API surface. Well-resourced projects updated in time, but many smaller apps, abandoned tools, and integrations baked into other products broke when v1 went dark — including, notably, file-sync features in third-party software whose maintainers had moved on.

While deprecating an old API is normal engineering practice, the shutdown still represented a unilateral product decision whose cost landed on developers and the end users who depended on those integrations, several of which never came back.