Failed requests logged the full request body to the browser console, so a
failing POST to /auth/login wrote the user's plaintext password where it
could be captured by error-reporting tools, screen shares, or support
sessions.
Redaction is applied centrally in the logger rather than at the call sites,
so every current and future caller is covered:
- createLogData() redacts context before it is serialized, covering the
JSON branches of error() and warn().
- The debug-level branches of error() and warn() printed the raw context
object directly, bypassing createLogData(); they now print the redacted
copy.
- debug() and info() redact their free-form data argument.
Keys are matched case-insensitively on a substring after stripping dashes
and underscores, so password, newPassword, X-Api-Key and Authorization are
all caught. The walk copies rather than mutates the caller's object, cuts
genuine cycles without mislabelling repeated siblings, and renders
FormData/Blob as a type marker instead of walking them.
Affected paths were POST (/auth/login, /auth/register) and PATCH/PUT, which
carry monitor secrets. Error-level logging is on by default, so this was
not limited to debug builds.
Fixes#3843
gorkem-bwl
Alex Holliday