{"record":{"id":"e622d466736ff193","repo":"nats-io/nats-server","slug":"malformed-subject","errorCode":null,"errorMessage":"malformed subject","messagePattern":"malformed subject","errorType":"error_code","errorClass":null,"httpStatus":null,"severity":"error","filePath":"server/errors.go","lineNumber":204,"sourceCode":"\n\t// ErrNoRespondersRequiresHeaders signals that a client needs to have headers\n\t// on if they want no responders behavior.\n\tErrNoRespondersRequiresHeaders = errors.New(\"no responders requires headers support\")\n\n\t// ErrClusterNameConfigConflict signals that the options for cluster name in cluster and gateway are in conflict.\n\tErrClusterNameConfigConflict = errors.New(\"cluster name conflicts between cluster and gateway definitions\")\n\n\t// ErrClusterNameRemoteConflict signals that a remote server has a different cluster name.\n\tErrClusterNameRemoteConflict = errors.New(\"cluster name from remote server conflicts\")\n\n\t// ErrClusterNameHasSpaces signals that the cluster name contains spaces, which is not allowed.\n\tErrClusterNameHasSpaces = errors.New(\"cluster name cannot contain spaces\")\n\n\t// ErrClusterNameReserved signals that the cluster name is reserved for internal protocol use.\n\tErrClusterNameReserved = errors.New(\"cluster name is reserved\")\n\n\t// ErrMalformedSubject is returned when a subscription is made with a subject that does not conform to subject rules.\n\tErrMalformedSubject = errors.New(\"malformed subject\")\n\n\t// ErrSubscribePermissionViolation is returned when processing of a subscription fails due to permissions.\n\tErrSubscribePermissionViolation = errors.New(\"subscribe permission violation\")\n\n\t// ErrNoTransforms signals no subject transforms are available to map this subject.\n\tErrNoTransforms = errors.New(\"no matching transforms available\")\n\n\t// ErrCertNotPinned is returned when pinned certs are set and the certificate is not in it\n\tErrCertNotPinned = errors.New(\"certificate not pinned\")\n\n\t// ErrDuplicateServerName is returned when processing a server remote connection and\n\t// the server reports that this server name is already used in the cluster.\n\tErrDuplicateServerName = errors.New(\"duplicate server name\")\n\n\t// ErrMinimumVersionRequired is returned when a connection is not at the minimum version required.\n\tErrMinimumVersionRequired = errors.New(\"minimum version required\")\n\t// ErrLeafNodeMinVersionRejected is the leafnode protocol error prefix used\n\t// when rejecting a remote due to leafnodes.min_version.","sourceCodeStart":186,"sourceCodeEnd":222,"githubUrl":"https://github.com/nats-io/nats-server/blob/3a66a489d262bf89b71a71c955c94920394532f3/server/errors.go#L186-L222","documentation":"Subscription-time validation: the subject in a SUB fails subject-syntax rules (misplaced wildcards such as '>' not last, empty tokens, or illegal characters). The server sends -ERR 'Invalid Subject' to the client and returns this sentinel from processSub.","triggerScenarios":"Thrown at server/errors.go:204 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Place '>' only as the final token and '*' within tokens","Remove empty tokens (a..b) and illegal characters","Validate subjects client-side before subscribing"],"exampleFix":null,"handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"3a66a489d262bf89b71a71c955c94920394532f3","analyzedAt":"2026-09-02T04:41:54.247Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}