Synq Docs
Errors

Username taken

The `username_taken` error: HTTP 409 Conflict.

Someone else in the brand has this username (the account API).

FieldValue
codeusername_taken
status409 Conflict
titleUsername taken

Synq's APIs answer errors with a problem document (RFC 9457, application/problem+json). Its type is the address of this page, and its code is username_taken. Branch on code, never on title or detail: a code never changes once it ships, while the words may.

{
  "type": "…/errors/username_taken",
  "title": "Username taken",
  "status": 409,
  "code": "username_taken"
}

See every error code.