Function ParseJSONMap

internal/cmdutil/json.go:45–67

ParseJSONMap parses a JSON string into a map. Returns an empty (never nil) map for empty input or the JSON literal null, so callers can always overlay onto the result without a nil-map panic. Supports stdin (-), @file, @@-escape, and single-quote stripping via ResolveInput.

(input, label string, stdin io.Reader, fileIO fileio.FileIO)

// the result without a nil-map panic.
// Supports stdin (-), @file, @@-escape, and single-quote stripping via ResolveInput.
func ParseJSONMap(input, label string, stdin io.Reader, fileIO fileio.FileIO) (map[string]any, error) {
	resolved, err := ResolveInput(input, stdin, fileIO)
	if err != nil {
		return nil, errs.NewValidationError(errs.SubtypeInvalidArgument, "%s: %s", label, err).
			WithParam(label).
			WithCause(err)
	}
	if resolved == "" {
		return map[string]any{}, nil
	}
	var result map[string]any
	if err := json.Unmarshal([]byte(resolved), &result); err != nil {
		return nil, errs.NewValidationError(errs.SubtypeInvalidArgument, "%s invalid format, expected JSON object", label).
			WithParam(label).
			WithCause(err)
	}
	if result == nil {
		// `null` unmarshals into a nil map without error; normalize it so the
		// returned map is always writable, matching the empty-input case.
		return map[string]any{}, nil
	}
	return result, nil
}