diff --git a/multierror.go b/multierror.go
new file mode 100644
index 0000000..dfbe0aa
--- /dev/null
+++ b/multierror.go
@@ -0,0 +1,55 @@
+package multierror
+
+import (
+	"errors"
+	"fmt"
+	"sort"
+	"strings"
+)
+
+// New returns an error aggregate using the given map.
+func New(errs map[string]error) MultiError {
+	return MultiError{errs}
+}
+
+// MultiError represents aggregated errors, contained in a map.
+type MultiError struct {
+	Errors map[string]error
+}
+
+func (e MultiError) Error() string {
+	return e.details(0)
+}
+
+func (e MultiError) details(d int) string {
+	str := "{"
+	d++
+
+	keys := make([]string, 0, len(e.Errors))
+	for k := range e.Errors {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	for _, key := range keys {
+		str += indent(key, e.Errors[key], d)
+	}
+	d--
+	str += fmt.Sprintf("\n%v}", indentString("  ", d))
+
+	return str
+}
+
+func indent(k string, v error, d int) string {
+	istr := indentString("  ", d)
+
+	var typeErrors *MultiError
+	if errors.As(v, &typeErrors) {
+		return fmt.Sprintf("\n%v\"%v\": %v", istr, k, typeErrors.details(d))
+	}
+
+	return fmt.Sprintf("\n%v\"%v\": \"%v\"", istr, k, v)
+}
+
+func indentString(indent string, n int) string {
+	return strings.Repeat(indent, n)
+}