diff --git a/cmdparse/formatters.py b/cmdparse/formatters.py
new file mode 100644
index 0000000..27a31d8
--- /dev/null
+++ b/cmdparse/formatters.py
@@ -0,0 +1,83 @@
+"""Output formatting for JSON/CSV/YAML formats."""
+
+import json
+import csv
+import io
+from typing import List, Dict, Any
+
+
+def format_json(data: List[Dict[str, Any]], pretty: bool = True) -> str:
+    """Format parsed data as JSON."""
+    if pretty:
+        return json.dumps(data, indent=2, ensure_ascii=False)
+    return json.dumps(data, ensure_ascii=False)
+
+
+def format_yaml(data: List[Dict[str, Any]]) -> str:
+    """Format parsed data as YAML."""
+    import yaml
+
+    class SafeLineBreakDumper(yaml.SafeDumper):
+        def write_line_break(self, data=None):
+            super().write_line_break(data)
+
+    try:
+        return yaml.dump(data, Dumper=SafeLineBreakDumper, default_flow_style=False, allow_unicode=True)
+    except Exception:
+        return yaml.dump(data, default_flow_style=False, allow_unicode=True)
+
+
+def format_csv(data: List[Dict[str, Any]]) -> str:
+    """Format parsed data as CSV."""
+    if not data:
+        return ""
+
+    output = io.StringIO()
+    if data:
+        fieldnames = list(data[0].keys())
+        writer = csv.DictWriter(output, fieldnames=fieldnames)
+        writer.writeheader()
+        writer.writerows(data)
+
+    return output.getvalue()
+
+
+def format_raw(data: List[Dict[str, Any]]) -> str:
+    """Format parsed data as raw text (simple representation)."""
+    if not data:
+        return ""
+
+    lines = []
+    for i, row in enumerate(data):
+        if isinstance(row, dict):
+            for key, value in row.items():
+                lines.append(f"{key}: {value}")
+        else:
+            lines.append(str(row))
+
+    return '\n'.join(lines)
+
+
+def format_data(data: List[Dict[str, Any]], output_format: str) -> str:
+    """
+    Format parsed data into specified output format.
+
+    Args:
+        data: List of dictionaries to format
+        output_format: Format to use ('json', 'csv', 'yaml', 'raw')
+
+    Returns:
+        Formatted string output
+    """
+    format_lower = output_format.lower() if output_format else 'json'
+
+    if format_lower == 'json':
+        return format_json(data)
+    elif format_lower == 'yaml':
+        return format_yaml(data)
+    elif format_lower == 'csv':
+        return format_csv(data)
+    elif format_lower == 'raw':
+        return format_raw(data)
+    else:
+        return format_json(data)