gravitational/teleport · error

unsupported json type %T

Error message

unsupported json type %T

What it means

Type-switch default in anyToGogoValue: the value being converted into a protobuf Struct Value is not one of the supported JSON types (nil, bool, float64, string, map[string]any, []any), so it cannot be represented in a gogotypes.Value.

Source

Thrown at api/types/struct.go:146

		}

		return &gogotypes.Value{Kind: &gogotypes.Value_StructValue{StructValue: s}}, nil
	case []any:
		vals := make([]*gogotypes.Value, len(t))
		for i, item := range t {
			val, err := anyToGogoValue(item)
			if err != nil {
				return nil, err
			}

			vals[i] = val
		}

		return &gogotypes.Value{Kind: &gogotypes.Value_ListValue{
			ListValue: &gogotypes.ListValue{Values: vals},
		}}, nil
	default:
		return nil, fmt.Errorf("unsupported json type %T", v)
	}
}

View on GitHub (pinned to 1283425b60)

Solutions

1. Ensure the input struct only contains JSON-serializable types (as produced by encoding/json)
2. Avoid feeding values like int, int64, or arbitrary Go structs; marshal/unmarshal through JSON first to normalize them

When it happens

Trigger: Thrown at api/types/struct.go:146 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of gravitational/teleport@1283425b60 (2026-09-02). Data as JSON: /api/errors/00ebcc76e80e3d3d. Report an issue: GitHub.