Drop-in address autofill widget for checkouts - vanilla JS http://git.cep.is/autofill/atom?h=main 2026-07-27T23:37:47Z 2026-07-27T23:37:47Z Murilo Ijanc murilo@ijanc.org 2026-07-27T23:37:47Z urn:sha1:c4032605e0833a4c74d9bf58e679a83349ce9fb1 A CEP lookup that fails is rarely a random number: it is usually someone who knows the city and guessed the last digits, most often the -000 that 957 municipalities never received. The API now answers those 404s with a `faixa` naming the municipality the number would have belonged to and the first and last CEP that really exist there, so the shopper can be told "esse número seria de Areal/RJ" instead of a bare "não encontrado". It stays an error. The address does not exist, so no field is filled from `faixa` — quietly writing the city of a CEP that does not exist would produce a wrong address, which is worse than an empty form. Only the wording of the message changes. The range is sparse (Areal has 118 CEPs over some 4,900 numbers), so it is shown as a hint of where to look, never as a list to pick from. Parsing is defensive throughout: a body that is not JSON, a `faixa` that is not an object, a missing localidade or uf, a malformed range — each falls back to the message shipped before, and none of it can throw. 2026-07-26T18:01:02Z Murilo Ijanc murilo@ijanc.org 2026-07-26T18:01:02Z urn:sha1:36486007ccada8c31d30e8f528d21233cabce32c