{"record":{"id":"6e5b07afce6a91ee","repo":"ory/kratos","slug":"s-could-not-marshal-the-traits-schema-this-usua","errorCode":null,"errorMessage":"%s: Could not marshal the traits schema. This usually means there is a problem with your upstream service as it served an invalid response.","messagePattern":"(.+?): Could not marshal the traits schema\\. This usually means there is a problem with your upstream service as it served an invalid response\\.","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"cmd/identities/validate.go","lineNumber":128,"sourceCode":"\t}\n\n\t// get custom identity schema id\n\tsid := gjson.Get(i, \"schema_id\")\n\tif !sid.Exists() {\n\t\t_, _ = fmt.Fprintf(cmd.ErrOrStderr(), `%s: Expected key \"schema_id\" to be defined in identity file`, src)\n\t\treturn cmdx.FailSilently(cmd)\n\t}\n\n\tcustomSchema, ok := schemas[sid.String()]\n\tif !ok {\n\t\tts, _, err := getRemoteSchema(cmd.Context(), sid.String())\n\t\tif err != nil {\n\t\t\t_, _ = fmt.Fprintf(cmd.ErrOrStderr(), \"%s: Could not fetch schema with ID \\\"%s\\\": %s\\n\", src, sid.String(), err)\n\t\t\treturn cmdx.FailSilently(cmd)\n\t\t}\n\t\tsf, err := json.Marshal(ts)\n\t\tif err != nil {\n\t\t\treturn errors.Wrap(err, fmt.Sprintf(\"%s: Could not marshal the traits schema. This usually means there is a problem with your upstream service as it served an invalid response.\", src))\n\t\t}\n\n\t\t// compile custom identity schema\n\t\tcustomSchema, err = jsonschema.CompileString(cmd.Context(), \"identity_traits.schema.json\", string(sf))\n\t\tif err != nil {\n\t\t\t_, _ = fmt.Fprintf(cmd.ErrOrStderr(), \"%s: Could not compile the traits schema: %s\\n\", src, err)\n\t\t\treturn cmdx.FailSilently(cmd)\n\t\t}\n\t\tschemas[sid.String()] = customSchema\n\t}\n\n\t// validate against custom identity schema\n\terr = customSchema.Validate(bytes.NewBufferString(i))\n\tif err != nil {\n\t\t_, _ = fmt.Fprintf(cmd.ErrOrStderr(), \"%s: not valid\\n\", src)\n\t\tjsonschemax.FormatValidationErrorForCLI(cmd.ErrOrStderr(), []byte(i), err)\n\t\tfoundValidationErrors = true\n\t}","sourceCodeStart":110,"sourceCodeEnd":146,"githubUrl":"https://github.com/ory/kratos/blob/b86338da04a040247a07f46100a86dcfb3875909/cmd/identities/validate.go#L110-L146","documentation":"After fetching a remote identity traits schema by ID, ValidateIdentity marshals the fetched schema (ts) back to JSON to compile it locally. If json.Marshal of the fetched schema fails, this error wraps the marshal failure. The message hints that the upstream service returned data that cannot be re-serialized as valid JSON.","triggerScenarios":"Running `identities validate` against a remote schema ID whose fetched content, when marshaled (json.Marshal(ts)), fails — e.g. the upstream schema registry returned a non-serializable or corrupt document.","commonSituations":"Pointing the CLI at a misbehaving or incompatible schema host (wrong --schema-url / remote config), a proxy intercepting responses, or a schema endpoint serving HTML error pages instead of JSON.","solutions":["Inspect the wrapped json.Marshal error to see what value failed to serialize.","Fetch the schema ID manually (curl) and verify the endpoint returns valid JSON schema.","Check that the configured schema URL points to the correct, healthy upstream service.","Fix or replace the broken schema document on the upstream service, then retry."],"exampleFix":"// before: upstream serves invalid schema\nidentities validate remote --schema-url https://broken-host/schemas\n// after: verify and use a valid schema endpoint\n curl -s https://correct-host/schemas/identity-traits | jq .\nidentities validate remote --schema-url https://correct-host/schemas","handlingStrategy":"validation","validationCode":"resp, err := http.Get(schemaURL)\nif err != nil { return err }\nbody, _ := io.ReadAll(resp.Body)\nvar probe map[string]any\nif err := json.Unmarshal(body, &probe); err != nil {\n    return fmt.Errorf(\"schema endpoint did not return valid JSON: %w\", err)\n}","typeGuard":"func isValidJSONSchema(b []byte) bool {\n    var v map[string]any\n    return json.Unmarshal(b, &v) == nil\n}","tryCatchPattern":"if err := validateIdentity(cmd, args); err != nil {\n    var marshalErr *json.MarshalTypeError\n    if errors.As(err, &marshalErr) {\n        fmt.Fprintf(os.Stderr, \"upstream schema invalid: %v\\n\", err)\n    }\n    return err\n}","preventionTips":["Health-check the schema host before running validate in CI","curl the schema ID and pipe through jq to confirm valid JSON","Pin schemas locally where possible instead of remote fetches"],"tags":["json","marshal","upstream-service","cli"],"backgroundTag":"json-marshal-failed","analyzedSha":"b86338da04a040247a07f46100a86dcfb3875909","analyzedAt":"2026-09-07T15:58:15.934Z","contentChangedAt":"2026-09-07T15:58:15.934Z","schemaVersion":2},"datasetVersion":"2026-09-16T09:17:16.951Z"}