Proposal Details

I'd like to be able configure indentation when using the slog.JSONHandler in development. I'm aware that I can implement my own handler which support whatever formatting I like, but it would nice if this was built-in.

Proposal:

Add a JSONHandler.SetIndent method which mirrors the json.Encoder.SetIndent method.

package slog

// SetIndent instructs the handler to format the json output.
// Calling SetIndent("", "") disables indentation.
func (h *JSONHandler) SetIndent(prefix, indent string) 

Considerations:

I took at look the JSONHandler implementation and it appears to implement its own json encoder rather than using encoding/json. I assume this is for performance reasons. In light of this, adding indentation support probably isn't worth it. But I'll leave this here anyway.