Guide: Error Handling¶

For the full reference of all error types, errors.As patterns, and slog integration, see the feature page.

Feature: Error Handling

Key pattern: errors.As + named slog.Logger¶

logger := slog.Default().With("transport", "http-client")

var pathErr rest.PathParamError
if errors.As(err, &pathErr) {
    logger.Warn("param rejected (no request sent)",
        "param", pathErr.Name,
        "value", pathErr.Value,
        "cause", pathErr.Err,
    )
}

Every error type implements slog.LogValuer — pass them directly to slog.Any(...) for structured key-value output.

Examples¶

• examples/error-types — every error type demonstrated with errors.As and slog
• examples/decode-errors — multi-field ValidationErrors with HTTP 400 response patterns